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This category covers lossless compression methods that can't be pinned down to one of the more refined topics, such as LZW or Zip. In some cases, the items here are esoteric algorithms that don’t' merit their own topics. In other cases, they span one or more existing topics. The unifying theme is of course that they are lossless. This means that after compressing and then decompressing, the data set in quesition will be bit-for-bit identical.

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XWRT - XML and text compressor

Lossless area, SourceCode content, NonCommercialProgs content XWRT (XML-WRT) is a high-performance XML compressor (it also works with textual files). It transforms XML to a more compressible form and uses zlib (default), LZMA, PPMVC, or lpaq6 as a back-end compressor. It is similar to XMill, but has many improvements. Takes fourth and third places in LTCB text compression benchmark as for January 2008. The author is Przemyslaw Skibinski. Created:  29/01/2008 More...
sourceforge.net/project/showfiles.php?group_id=176333

PeaZip archiver

Compression area, Lossless area, SourceCode content, NonCommercialProgs content PeaZip is an archiver tool that supports its native Pea archive format (featuring compression, split volumes, and flexible authenticated encryption and integrity check schemes) and other mainstream formats, with special focus on handling open formats. Create and extract 7Z, 7-Zip sfx, Bzip2, Gzip, PEA, split, TAR, and ZIP. Browse and extract CAB, JAR, LZH, RAR and many more archive formats. Created:  02/02/2007 More...
peazip.sourceforge.net/

Squeeze Chart Website: lossless compression benchmark

Lossless area, BenchmarksTests content Benchmark of over 200 archivers on the world's largest testsets; also features benchmarks on .jpg, .mpg, .pdf, .mp3, .mp4, .mov, .wmv, .rm, Installer packages and other hard-to-compress files; includes the "Ten Commandments of Compression", reports best performances by year and by file format, etc. Created:  31/01/2007 More...
squeezechart.freehost.ag

Lossless Video Codecs Comparison - 2007

Benchmarks area, Lossless area, Video area, BenchmarksTests content, Lossless_Video_Codecs area rating: **** The main goal of the performed comparison is getting answers on the following questions regarding lossless video codecs:
  • What codec or codecs are best for video capture and video editing applications?
  • What codec or codecs achieve the best compression ratio?
  • What advantages multithreading gives to modern codecs supporting it? Only absolutely lossless codecs were studied in this comparison. Only progressive test video sequences were used. Was tested folowing codecs:
    1. Alpary
    2. ArithYuv
    3. AVIzlib
    4. CamStudio GZIP
    5. CorePNG
    6. FastCodec
    7. FFV1
    8. Huffyuv
    9. Lagarith
    10. LOCO
    11. LZO
    12. MSU Lab
    13. PICVideo
    14. Snow
    15. x264
    16. YULS
    Created:  05/04/2007 by Dmitriy Vatolin More...
    • www.compression.ru/video/codec_comparison/lossless_codecs_2007_en.html

    Practical Binary Adaptive Block Coder

    ArithmeticCoding area, Lossless area, Papers content Paper and source code of an efficient binary adaptive encoder of iid sequences. Outperforms several existing arithmetic-codes-based implementations (JBIG's Q-coder, H.264's CABAC) on short sequences. Created:  22/01/2007 More...
    arxiv.org/abs/cs/0701079

    Hutter Prize -- lossless compression contest

    Benchmarks area, Lossless area, BenchmarksTests content rating: **** The contest is about compressing the human world knowledge as well as possible. The intention of this prize is to encourage development of intelligent compressors/programs. The goal is to compress the first 100MB of Wikipedia better than your predecessors. The total prize is about 50'000€. Created:  23/12/2006 by Maxim Smirnov More...
    prize.hutter1.net/

    ZipForge.NET - .NET ZIP component

    Archiving area, Lossless area, Zip area, CommercialLibs content ZipForge.NET is a fast .NET framework zip component. With this toolkit you can easily add zip archive functionality to your projects. Free for personal use. Royalty-free for commercial use. ZipForge.NET is 100% managed .NET component written in pure C#. Key features: Creates and handles ZIP files 100% managed native .NET code Adds, moves, extracts, deletes, updates, tests, refreshes a group of files by a single operation SFX archives support Extensive help A lot of demos (C#, VB.NET and Delphi.NET demos are included) Royalty-free Full source code is availaboe Created:  15/07/2006 by Kevin Goldberg More...
    www.componentace.com/.NET_zip_component_zipforge.htm

    ZLIB.NET - ZLIB compression library for .NET

    Zlib area, Lossless area, SourceCode content, NonCommercialLibs content rating: *** 100% managed zlib compression library version for .NET Full C# source code is included. Created:  15/07/2006 by Kevin Goldberg More...
    www.componentace.com/ZLIB.NET

    Hifn, Inc.

    Lossless area, CommercialLibs content, Hardware content Hifn makes lossless compression hardware and software. They have a bunch of chips that implement LZS and MPCC compression, plus a library that does the same thing. I have been led to believe that these algorithms are partially or completely protected by patents. M.N. Created:  18/12/2001 by Mark Nelson More...
    www.hifn.com/products/Compression.html

    George Buynovsky's Post on ACB

    Lossless area, NewsgroupPosts content rating: ** ACB is poorly understood. The author, George Buynovsky, has only made a few public comments on the algorithm. This is one of them. Created:  06/01/2000 by Mark Nelson More...
    www.cbloom.com/news/bygeorge.html

    Xmill paper

    Lossless area, Esoterica area, Papers content rating: ***** A technical paper describing the principles behind Xmill, the AT&T package that compresses XML data items. Created:  18/12/1999 by Mark Nelson More...
    www.cis.upenn.edu/~liefke/papers/xmill.ps.gz

    The Art Of Lossless Data Compression

    Benchmarks area, ImageCompression area, Lossless area, Links content, BenchmarksTests content rating: *** A comprehensive set of tests on lossless data compression. Created:  10/06/2001 by Mark Nelson More...
    www.compression.ru/artest/index_e.html

    Xmill - An Efficient Compressor for XML

    Lossless area, SourceCode content, Papers content Those folks at AT&T have developed a compressor that can be used to squeeze individual data items in XML documents. AT&T says this is "essentially free" software. Read the license on-line to determine exactly what that means. Also available on http://sourceforge.net/projects/xmill Created:  19/12/1999 by Mark Nelson More...
    www.liefke.com/hartmut/xmill/xmill.html

    DC Micro

    Archiving area, Lossless area, Zip area, CommercialLibs content, Companies content rating: **** Home page for DC Micro, home of Crusher!, the data compression toolkit Created:  03/06/2000 by Mark Nelson More...
    www.dcmicro.com/

    ACB compressor description

    Lossless area, NewsgroupPosts content A post from Leonid A. Broukhis discussing the mysterious ACB compressor by George Buynovksy. Created:  06/01/2000 by Mark Nelson More...
    www.cbloom.com/news/leoacb.html

    Data Compression Overview

    Tutorials content, Lossless area rating: **** An overview of the field by Debra A. Lelewer and Daniel S. Hirschberg. Lots of informative text. This appears to be a survey paper that was adapted for presentation on the web. Lossless compression techniques only! Created:  10/11/1999 by Mark Nelson More...
    www.ics.uci.edu/~dan/pubs/DataCompression.html

    Peter Fenwick.

    Lossless area, BWT area, People content rating: ***** Dr. Peter Fenwick's home page. Fenwick has links to several of his compression papers on this page, including several recent papers discussing BWT algorithms. Created:  01/01/2000 by Mark Nelson More...
    www.cs.auckland.ac.nz/~peter-f/

    HTMLZip

    Lossless area, CommercialLibs content HTMLZip is a utility to creating compressed HTML pages. True compression algorithm reduces files to 20%-70% of original. JavaScript is used for extracting in your browser (no third-party software).
    Compatible:
    HTMLZip is compatible with MS Internet Explorer 4.0, 5.0, 5.5, Netscape Navigator 4.x, 6.0, Mozilla/M15-M17, Opera 4.0 beta 2.
    HTMLZip is not compatible with MS IE 3.0 and NN 3.0.
    HTMLZip is not compatible with Opera 4, 5, 6. They has a bug in JavaScript (function indexOf()). We have reported Opera's developers about. Created:  12/10/2002 by Mark Nelson More...
    www.htmlzip.com/software.html

    BMF image compression utility

    ImageCompression area, Lossless area, NonCommercialProgs content rating: *** BMF program is lossless/near-lossless image compression utility by Dmitriy Shkarin. It supports true colour, high colour, greyscale and paletted images compression.
    See last version on http://www.compression.ru/ds/ (in Russian) Created:  07/11/1999 by Mark Nelson More...
    ftp://ftp.elf.stuba.sk/pub/pc/pack/bmf_1_10.zip

    Compression Basics by Pasi 'Albert' Ojala

    Tutorials content, Lossless area, Links content rating: ***** An introductory paper. Includes information on Huffman coding, Info Theory, Coding, LZ77, LZ78, and more. This page also has a good set of links. Created:  15/02/1999 by Mark Nelson More...
    www.cs.tut.fi/~albert/Dev/pucrunch/packing.html

    Explanation on Entropy Coding Methods for general purposes.

    Tutorials content, Huffman area, ArithmeticCoding area, LZW area, LZSS area, Compression area, Lossless area Explanation on Entropy Coding Methods for general purposes. Including: Arithmetic Coding. Huffman Coding. Lempel-Ziv Compression Methods. Auxilary preprocessing methods: BWT - Burrows-Wheeler Transform. MTF - Move To Front. RLE - Run Length Encoding. RLE0 - Zero Run Length Encoding. Universal Integer Coding. Elias Universal Coding of integers. Fibonacci Universal Coding of integers. PPM - Prediction by Partial Matching. Created:  26/06/2005 by Arkadi More...
    compressions.sourceforge.net/Entropy.html

    Bernie's TMW0.51 Page

    ImageCompression area, Lossless area, NonCommercialProgs content rating: *** The home page for TMW. TMW is a program for losslessly compressing greyscale images that gives world class compression ratios, at the cost of being tremendously CPU intensive. The current version is TMW_0.51, and is still completely experimental Created:  07/11/1999 by Mark Nelson More...
    www.cs.monash.edu.au/~bmeyer/tmw/index.html

    Range coder

    Tutorials content, ArithmeticCoding area, Lossless area rating: ****** Arturo Campos describes a version of arithmetic coding which renormalizes in bytes, thus achiving twice the speed of an standard implementation and 0.01% less compression. Created:  17/11/1999 by Mark Nelson More...
    www.arturocampos.com/ac_range.html

    Quasi Static model

    Tutorials content, ArithmeticCoding area, Lossless area rating: ****** Arturo Campos describes a model for arithmetic coding which results in less compression than an adaptative one, but at much higher speeds. Created:  17/11/1999 by Mark Nelson More...
    www.arturocampos.com/ac_qsm.html

    Fujitsu Lossless Data Compression

    Lossless area, Japanese language FLDC, Fujitsu Lossless Data Compression Created:  01/01/1970 by Mark Nelson More...
    www.fdi.co.jp/product/compress.html

    The $5000 Compression Challenge

    Lossless area, Esoterica area, IncredibleClaims area, People content rating: ***** Patrick Craig has an interesting tale to tell. Without being a data compression expert, he managed to beat the $5000 compression challenge. You won't see him taking an ocean cruise with his winnings, though. DCL reader commented: The challenge was obviously met. Created:  25/04/2001 by Mark Nelson More...
    www.geocities.com/patchnpuki/other/compression.htm

    Dictionary Coders

    LZW area, LZSS area, Lossless area, SourceCode content rating: *** This page has links to the source code for a family of compressors written by Charles Bloom. This includes the LZP family, an LZW example, LZRW, and LZCB. Created:  14/11/1999 by Mark Nelson More...
    www.cbloom.com/src/index_lz.html

    Statistical Coders

    Huffman area, ArithmeticCoding area, Lossless area, AdaptiveHuffman area, SourceCode content rating: **** A group of statistical coders from Charles Bloom. This includes several different entropy encoders, including Huffman, Adaptive Huffman, Shannon-Fano, CACM Arithmetic coding, and a Skew Coder. Created:  06/11/1999 by Mark Nelson More...
    www.cbloom.com/src/index_st.html

    Universal Compression and Retrieval

    Lossless area, Books content rating: ***** By Rafail Krichevsky, Institute of Mathematics, Russian Academy of Sciences, Novosibirsk University, Russia. This volume constitutes a comprehensive self-contained course on source encoding.
    Reader Yuriy R. says: A concise and rigorous course on universal source coding and universal information retrieval. Only suitable for math. oriented readers, graduate students, and researchers in these fields. Engineers expecting to find source-code of data compression algorithms shall look elsewhere. Created:  19/01/2002 by Mark Nelson More...
    dannyreviews.com/h/Universal_Compression_and_Retrieval.html

    SynCE - Dynamite

    Lossless area, NonCommercialLibs content Dynamite is a tool and library for decompressing data compressed with PKWARE Data Compression Library and it was created from the specification provided by a post in the comp.compression newsgroup. Created:  29/07/2004 by Mark Nelson More...
    synce.sourceforge.net/synce/dynamite.php

    Stuns

    Lossless area, SourceCode content, NonCommercialProgs content This program tries to unpack the given file by application of several algorithms byte-by-byte. Result of work of the program is the set of files with the unpacked data. Many of the produced files are not correct. However, among them there can be correctly unpacked data. Correctly unpacked files have mainly significant sizes that distinguishes them from dust. Created:  28/07/2004 by Mark Nelson More...
    falinc.narod.ru/Stuns.zip

    axPAQ

    Lossless area, SourceCode content, NonCommercialProgs content A compressor built with the world-beating PAQAR 3.0 compressor. axPAQ wraps a GUI around the engine, and includes complete source. Created:  16/07/2004 by Mark Nelson More...
    www.alphaxsoftware.com/downloads/

    Estimating entropy rates with Bayesian confidence intervals

    Lossless area, Esoterica area, Papers content I'm pleased to announce with my co-authors availability of a preprint on our new algorithm to estimate the Shannon entropy rate (bits/symbol) or (bits/sec) of an observed sequence of low-alphabet symbols. It uses the Context-Tree-Weighting universal compression method, but doesnot use the compression ratio directly as an entropy estimator but as a scaffold for a Bayesian estimate. The result is significantly lower bias. Created:  10/07/2004 by Mark Nelson More...
    ftp://lyapunov.ucsd.edu/pub/nonlinear/bayesian_information/Kennel_Shlens_et_al_2004.pdf

    PJL Compressing Filter

    Lossless area, NonCommercialLibs content A J2EE servlet filter which compresses data written to the response. It supports several algorithms (gzip, deflate, etc.) and emphasizes minimal memory usage and high throughput. Also provides detailed performance stats. Created:  20/06/2004 by Mark Nelson More...
    sourceforge.net/projects/pjl-comp-filter/

    zisofs-tools

    Lossless area, NonCommercialLibs content The zisofs filesystem is an extension to the ISO9660 filesystem that allows files, on a file-by-file basis, to be stored compressed and decompressed in real time. The zisofs filesystem is supported by recent versions of Linux (2.4.14 or later). Legacy systems can still read uncompressed files. zisofs-tools contains the tools necessary to create such a compressed ISO9660 filesystem and to read compressed files on a legacy system. Created:  20/06/2004 by Mark Nelson More...
    freshmeat.net/projects/zisofs-tools/

    MoleBox

    Lossless area, CommercialProgs content Pack all your files into a single executable with MoleBox or MoleBox Pro. Created:  24/05/2004 by Mark Nelson More...
    www.molebox.com

    Parallel Implementation of Data Compression Technologies for Multi-Gbit/s Networks

    Lossless area, Papers content, Hardware content This group at Loughborough University in the UK would like to use sophisticated compression techniques in high speed networks. To make it all happen, they need to do it in hardware, and do it in parallel. This page has information about their efforts, along with links to papers and other information. Created:  15/05/2004 by Mark Nelson More...
    hhttp://www.lboro.ac.uk/departments/el/research/esd/projects/parallel_comp.htm

    X-Match Pro

    Lossless area, Hardware content A fast ASIC core designed for lossless compression. Created:  15/05/2004 by Mark Nelson More...
    www.lboro.ac.uk/departments/el/research/esd/projects/web_xmatch/XMatchPRO_home.htm

    Linux File System Compression

    Lossless area, NonCommercialProgs content This open source package, e2compr, provides transparent compression and decompression of Linux ext2 file systems.
    Version 0.4.44 is shipping as of April, 2004. Created:  25/04/2004 by Mark Nelson More...
    sourceforge.net/projects/e2compr/

    Comrpession Algorithms

    Lossless area, SourceCode content Arkadi Kagan has created a C++ project that implements a batch of our favorite lossless algorithms, including LZ77, LZ78, LZW, RLE, along with arithmetic and Huffman coding.
    Version 1.1 shipped in April, 2004. Created:  19/04/2004 by Mark Nelson More...
    sourceforge.net/projects/compressions/

    A Simple Yet Highly Efficient Compressing Technique

    Tutorials content, Lossless area, SourceCode content A nice CodeGuru article describing compression of a dictionary. Created:  27/03/2004 by Mark Nelson More...
    codeguru.com/Cpp/Cpp/algorithms/compression/article.php/c6403/

    The Benefits and Drawbacks of HTTP Compression

    Lossless area, Papers content, HTTP_Compression area A paper by Timothy McLaughlin that gives an overview of HTTP Compression and tries to decide whether it's a good thing for not. Created:  07/03/2004 by Mark Nelson More...
    www3.lehigh.edu/images/userImages/cdh3/Page_3456/LU-CSE-02-002.pdf

    Maximum Compression

    Benchmarks area, Lossless area, BenchmarksTests content rating: ***** Werner Bergmans has created a new benchmark site that aims to show the best compression ratios possible for multiple file types, including English text, executables, graphics, and so on. Werner says he is running these tests with 80-100 programs for each file type!
    Reader Werner B. says Useful site to compare results of different compression programs. Regularly updated. Created:  28/02/2004 by Mark Nelson More...
    www.maximumcompression.com/

    waRmZip

    Lossless area, NonCommercialProgs content This is a Win32 script that can be used to compress and/or delete files after a certain amount of time. Nice and simple.
    Version 1.2 shipped in January, 2004. Created:  01/02/2004 by Mark Nelson More...
    winadmin.sourceforge.net/warmzip.html

    (X)MedCon - Medical Image Conversion Utility

    GIF area, ImageCompression area, Lossless area, NonCommercialProgs content rating: ***** A free program to deal with image formats in popular medical formats, including DICOM, SPM, PNG, and GIF.
    Version 0.9.1 of (X)MedCon shipped in January, 2004. Created:  11/01/2004 by Mark Nelson More...
    xmedcon.sourceforge.net/

    The MLP Lossless Compression System

    Lossless area, Papers content A paper that details the lossless compression system used in DVD-Audio. Created:  11/01/2004 by Mark Nelson More...
    www.meridian-audio.com/w_paper/2_1.PDF

    MG4J: Managing Gigabytes for Java™

    Lossless area, NonCommercialLibs content A Java implementation of the inverted-index compression systems described in the book Managing Gigaybtes. This GPLed effort doesn't appear to have any connection with Witten, Moffat, or Bell.
    Version 0.8.2 is shipping in October, 2003. Created:  29/10/2003 by Mark Nelson More...
    mg4j.dsi.unimi.it/

    Algorithms for Triangulated Terrains

    Lossless area, Esoterica area, Papers content by Marc van Kreveld. This paper looks at a method for compressing geographical elevation data. Created:  07/10/2003 by Mark Nelson More...
    archive.cs.uu.nl/pub/RUU/CS/techreps/CS-1997/1997-32.pdf

    PDF Compress

    Lossless area, Esoterica area, NonCommercialProgs content Free PDF Compressor that removes duplicate PDF objects, optionally takes advantage of new compression features of latest PDF specification (1.5), and optionally takes advantage of a new proposed format called "Compact PDF" that for many classes of documents compresses 30 - 60% better than what is possible in PDF 1.5.
    Note: Navigate up two levels to get to Tom's download page.
    Version 2.2 is shipping as of February, 2004. Created:  12/09/2003 by Mark Nelson More...
    http.cs.berkeley.edu/~phelps/Multivalent/Tools/pdf/Compress.html

    Berto's Compression Spreadsheet

    Benchmarks area, Lossless area, BenchmarksTests content rating: ***** Comparisions of over 230 archivers, in handy Excel format, from Berto.
    Reader Emiliano C. said "Wonderful! Great! Wonderful! Cool!" Created:  10/09/2003 by Mark Nelson More...
    cs.fit.edu/~mmahoney/compression/ct.xls

    BitMagic

    Lossless area, NonCommercialLibs content BitMagic is C++ library designed and developed to implement efficient platform independent bitsets, with the following key features:
    • Several types of on-the-fly adaptive compression.
    • Dynamic range of addressable space of 232 bits.
    • Efficient memory management.
    • Serialization in platform independent, compact format suitable for storing in files and databases.
    • Performance tuning for 32-bit and 64-bit systems.
    Version 3.1.4 shipped August, 2003. Created:  18/08/2003 by Mark Nelson More...
    bmagic.sourceforge.net/

    GrepMail

    Internet area, Lossless area, NonCommercialProgs content This nifty program searches through a normal or compressed mailbox looking for strings. Supports Gzip, Bzip2, and tzip formats. Created:  18/08/2003 by Mark Nelson More...
    grepmail.sourceforge.net/

    libmspack - A library for Microsoft compression formats

    Lossless area, NonCommercialLibs content A project whose goal is to implement libraries to support the various and sundry compression formats that Microsoft has cooked up over the years. Early in the process, much work left to be done. Created:  29/07/2003 by Mark Nelson More...
    www.kyz.uklinux.net/libmspack/

    Text Preprocessing for Data Compression

    PPM area, Lossless area, BWT area, Papers content rating: ****** by Jurgen Abel and William Teahan. This paper looks at a few different techniques for preprocessing data before performing text compression, and compares the gains achieved when combining the preprocessors with PPM, BWT, and LZ algorithms. Created:  19/07/2003 by Mark Nelson More...
    www.data-compression.info/JuergenAbel/Preprints/Preprint_Text_Preprocessing.pdf

    A Bit-Wise Adaptable Entropy Coding Technique

    Lossless area, Papers content This paper describes an entropy encoder that can outperform Huffman or arithmetic coding. Created:  27/06/2003 by Mark Nelson More...
    www.nasatech.com/Briefs/July02/NPO21101.html

    Xceed Streaming Compression for .NET

    Gzip area, Zlib area, Lossless area, Zip area, CommercialLibs content rating: ****** Xceed Streaming Compression for .NET is an efficient and lightweight data compression class library for Microsoft .NET and ASP.NET. It can process any size byte array with ease and provides a true .NET pass-through stream object for automatically compressing or decompressing any .NET stream's data on the fly. It supports the GZip, Zlib, Deflate and Deflate64 compression formats. Created:  22/06/2003 by Mark Nelson More...
    www.xceedsoft.com/products/StreaNet/

    Xceed Streaming Compression Library

    Compression area, Zlib area, Lossless area, BWT area, CommercialLibs content rating: ****** The Xceed Streaming Compression Library is a high-performance "raw" compression library. It offers the ability to compress and decompress streaming data, buffers, strings or single files and supports multiple compressed data formats. Unlike the Xceed Zip Compression Library, this ultralight library doesn't offer Zip file handling capabilities. Created:  21/06/2003 by Mark Nelson More...
    www.xceedsoft.com/products/Stream/index.htm

    Xceed Zip for .NET Compact Framework

    Gzip area, Zlib area, Lossless area, Zip area, CommercialLibs content rating: ****** Xceed Zip for .NET Compact Framework is a data compression and all-purpose file manipulation class library for creating mobile apps. It provides flexible zip, gzip and streaming data compression capabilities for compact applications created with Visual Studio .NET 2003. The library includes an innovative and extensible filesystem object model that makes zip files as easy to work with as regular files or folders. Created:  21/06/2003 by Mark Nelson More...
    www.xceedsoft.com/products/ZipNetCF/index.htm

    SoftDefender

    Lossless area, Esoterica area, CommercialProgs content rating: ***** Soft Defender is a good exe file compressor, which can reduce the file size of 32-bit Windows programs by as much as 50%.In addition, Soft Defender is a perfect product of software protection of applications.With Soft Defender, your application can have anti-debugging, anti-tracer, anti-disassemble, anti-dumping, anti-apihook, file integrity checking functions in seconds. It requires no source code editing or your registration algorithm changing. Created:  12/06/2003 by Mark Nelson More...
    www.softdefender.com/

    CodeProject: Compress Data

    Lossless area, NonCommercialLibs content A new article on The CodeProject describing code to compress/decompress to/from an ISequentialStream interface. Code is supplied to implement this for Cfile and CByteArray. The compression itself is done via zlib. The rationale for this project is that the author needed cookbook code that worked with MFC objects. Created:  21/04/2003 by Mark Nelson More...
    codeproject.com/useritems/CompressData.asp

    Lossless Audio Compression

    Tutorials content, Lossless area This document describes a lossless audio compressor that does some straightforward prediction in combination with a Rice coder. This is credited to Matt Ashland, author of the Monkey's Audio codec. Created:  14/04/2003 by Mark Nelson More...
    www.monkeysaudio.com/theory.html

    What is D-Gap Compression?

    Tutorials content, Lossless area, Esoterica area BitMagic is a C++ library that deals with dynamic bit vectors. It supports a couple of different ways to compress these bit vectors. This page discusses D-Gap Compression. Created:  14/04/2003 by Mark Nelson More...
    bmagic.sourceforge.net/dGap.html

    Bitmagic Hierarchical Compression

    Tutorials content, Lossless area, Esoterica area BitMagic is a C++ library that deals with dynamic bit vectors. It supports a couple of different ways to compress these bit vectors. This page explains how to perform common operations on bit vectors while they are compressed in memory. Created:  14/04/2003 by Mark Nelson More...
    bmagic.sourceforge.net/hCompression.html

    PipeBoost

    Lossless area, CommercialProgs content PipeBoost offers HTTP Compression software that comes with a big list of customers and testimonials. You can download a 30 day trial copy, so you have nothing to lose! Created:  27/03/2003 by Mark Nelson More...
    www.pipeboost.com

    BrowseBlast Web Accelerator

    Lossless area, CommercialProgs content The press release says: Ikano and SlipStream launched the BrowseBlast Internet service for U.S. consumers. SlipStream's Web Accelerator is supposed to increase connection speed significantly for dial-up and wireless connections. The software compresses Web content once it leaves the server, increasing browsing speeds to five times the traditional dial-up or wireless speed. Created:  27/03/2003 by Mark Nelson More...
    www.browseblast.com/

    Context Tree Weighting

    Lossless area, People content, Papers content, Links content rating: ****** Context Tree Weighting (CTW) has been a technique with great promise, but it hasn't ever been able to reach the critical mass needed to become more than a curiousity. Jurgen Abel is doing his best to overcome that problem. He's created a nice reference page for CTW on his data-compression.info web site. He has references to a few papers, a few people, and one piece of source code. Created:  21/03/2003 by Mark Nelson More...
    www.data-compression.info/Algorithms/CTW/

    Recommendation for Space Data Systems Standards

    Lossless area, Standards content This appears to be the Data Compression Blue Book published by the Consultative Committee for Space Data Systems. It's a nice document, but I'm not sure if the standard described here is actually in use. As is so often the case with standards documents, I find myself yearning for some accompanying reference code. Alas, there is none that I know of.
    Note: a related document discussing performance characteristics of the recommendate can be found here Created:  19/01/2003 by Mark Nelson More...
    www.ccsds.org/documents/121x0b1.pdf

    BitJazz

    ImageCompression area, Lossless area, CommercialLibs content rating: *** A company that makes PhotoJazz, a lossless compression plug in package that they describe as having Breakthrough lossless photo-quality compression of stills and movies for archival, print, and the Internet. Version 2.0 supports Mac and Windows, Photoshop, QuickTime, and Quark. You can download the Reader for free and try it out. Created:  13/12/2002 by Mark Nelson More...
    www.bitjazz.com

    Master Creative Software

    Lossless area, CommercialLibs content Supplier of data comrpession libraries to use with FoxPro. Includes FOXSQZ, an archiving and compression library, COMP5, a compression library, and JavaSQZ, a data compression library for Java. Created:  13/12/2002 by Mark Nelson More...
    ourworld.compuserve.com/homepages/masterw/

    Compressed Postscript Documents - FAQ

    Tutorials content, Lossless area A Technical Documentation bulleting from TI that answers the question "What is a Compressed Postscript (.psz) File?" Created:  13/12/2002 by Mark Nelson More...
    www.ti.com/sc/docs/psheets/psform.htm

    Sequitir - inferring hierarchies from sequences

    Lossless area, Esoterica area, SourceCode content, Papers content SEQUITUR is a method for inferring compositional hierarchies from strings. It detects repetition and factors it out of the string by forming rules in a grammar. The rules can be composed of non-terminals, giving rise to a hierarchy. It is useful for recognizing lexical structure in strings, and excels at very long sequences. Created:  09/11/2002 by Mark Nelson More...
    sequence.rutgers.edu/sequitur/

    R. Nigel Horspool -- On-Line Publications

    Lossless area, Papers content The compression-related papers seem to concentrate on LZ and other lossless methods. Created:  12/10/2002 by Mark Nelson More...
    www.csr.uvic.ca/~nigelh/pubs.html

    David Clunie's Medical Image Format Site

    ImageCompression area, Lossless area, Links content rating: * David Clunie is the chair of the DICOM standards committee, and has a wealth of links on this page to information related to medical imaging. Created:  28/09/2002 by Mark Nelson More...
    dclunie.com/

    Vidfern Squeezer

    Lossless area, Esoterica area, NonCommercialProgs content rating: ***** Squeezer is another executable compressor for Windows, and it's now free. Here's what you'll read on the Vidfern web site:
    Vidfern Squeezer as the best file compressor, can squeeze executable files as well as text and HTML files. Get more space by squeezing your files! Squeezer is now free for personal and commercial use. It is fully functional, easy and powerful.

    Reader Vali from the jp TLD said Thanks to all who create this real good product. I found it a very nice and easy compressor that supports exe, html and text files freely! Created:  15/09/2002 by Mark Nelson More...
    www.vidfern.7p.com/squeezer/

    The DICOM Standard

    Tutorials content, JBIG area, ImageCompression area, Lossless area, Links content This page gives a short introduction to the DICOM standard, commonly used for medical imaging. It has a lengthy set of links to DICOM viewers, images, and other resources. Created:  18/08/2002 by Mark Nelson More...
    www.psyc.nott.ac.uk/staff/cr1/dicom.html

    Error Modeling for Hierarchical Lossless Image Compression

    ImageCompression area, Lossless area, Papers content by P.G> Howard and J.S. Vitter. This paper from DCC '92 describes an improved method for error modeling in hierarchical lossless image compression. Created:  28/07/2002 by Mark Nelson More...
    www.cs.duke.edu/~jsv/Papers/catalog/node65.html

    Text Compression via Alphabet Re-representation

    Lossless area, Papers content by P. M. Long, A. I. Natsev, and J. S. Vitter, from DCC '97. Created:  28/07/2002 by Mark Nelson More...
    www.cs.duke.edu/~jsv/Papers/catalog/node77.html

    Lossless Compression Algorithms (Entropy Encoding)

    Tutorials content, Huffman area, ArithmeticCoding area, LZW area, Lossless area rating: *** An overview of the basics, including Shannon-Fano, Huffman, Arithmetic coding, and a section on LZW for good measure. Created:  20/07/2002 by Mark Nelson More...
    www.cs.cf.ac.uk/Dave/Multimedia/node207.html

    The Golomb/Rice Image Compression Web Page

    Tutorials content, ImageCompression area, Lossless area A senior project whose goal was to design a hardware compressor for continuous tone images. Contains a description of the algorithm, Matlab implementations, chip designs, and more. Created:  15/07/2002 by Mark Nelson More...
    www.ece.utep.edu/research/webspc/wwwdocs/teams/golombriceimag/welcome_to_the_golomb.htm

    Japanese Lossless Video Codec

    Tutorials content, Lossless area, Video area I'll have to take the word of the submitter on this site - it is entirely written in Japanese. Any DataCompression.info user who is fluent in the language is invited to provide a more detailed description. There are a couple of zip files on the site that perhaps contain demo programs? Created:  15/05/2002 by Mark Nelson More...
    www.geocities.co.jp/Playtown-Denei/2837/LRC.htm

    GEMAC

    Lossless area, German language, Companies content, Hardware content This company sells an IP core that performs lossless data compression. Not sure what algorithm they are using, it is described as "GEMAC's data compression algorithm." This algorithm was first published at DCC '95, and is described as a hybrid of ZL1 and ZL2, created with the goal of maximizing compression rate. Created:  14/05/2002 by Mark Nelson More...
    www.gemac-chemnitz.de/

    Aurora Borealis - a new way of compression

    Tutorials content, Lossless area, Esoterica area rating: * This document describes the Aurora Borealis algorithm, which combines statistical analysis with a back end using an unknown type of coding. Author Michael Asse seems to have high hopes for this technique.
    DataCompression.info reader Viktor F. had this to say: This compression method is inefficient. LZW can beat this easily. The author should read some books about compression. Created:  22/04/2002 by Mark Nelson More...
    westpdmkids.tripod.com/techdocs.txt

    Technical Overview of Cartesian Perceptual Compression

    Tutorials content, ImageCompression area, Lossless area This is a bi-level image compression scheme designed to be used for scanned images of books, faxes, etc. It is a non-degrading scheme, but not lossless. The company reports that their current customer list includes GetThePatent.com, FIS|Online, JSTOR, and Kurzweil. More information about clients and partners can be found here. Created:  08/04/2002 by Mark Nelson More...
    www.cartesianinc.com/Tech/tech-overview.html

    QuikCat Technologies

    Lossless area, Companies content These guys use compression to increase messaging throughput on your network. Looks like they work with Microsoft Exchange, as well as having a general purpose product for ISPs. Created:  04/04/2002 by Mark Nelson More...
    www.quikcat.com/

    Off-Line - Data Compression by Textual Substitution

    Lossless area, SourceCode content, Papers content A novel algorithm by Stefano Lonardi. It recursively replaces words in text with pointers, and boasts of good results. Source and papers regarding Off-Line can all be found here. Created:  04/03/2002 by Mark Nelson More...
    www.cs.ucr.edu/~stelo/Offline/

    The UCL Compression Library

    Lossless area, LZO area, NonCommercialLibs content rating: **** UCL is a portable lossless data compression library written in ANSI C. This work is from Markus F.X.J. Oberhumer, known for LZO, UPX and more.
    DataCompression.info reader Swift G. had this to say: Excellent library. The compression routines are fast and if you need binary compression this is the way to go. Created:  27/02/2002 by Mark Nelson More...
    www.oberhumer.com/opensource/ucl/

    Websites: Lossless Compression

    Lossless area, Links content Links to various lossless compression sites. Inlcudes a few things off the beaten path. Created:  26/02/2002 by Mark Nelson More...
    www.ganesh.org/related/loss.html

    EasyCompression Library for Delphi

    Lossless area, CommercialLibs content EasyCompression Library is a TFileStream, TMemoryStream and other TStream descendants replacement to their analogues with transparent compression/decompression and encryption in the same stream. All the methods, properties and behavior of TFileStream and TMemoryStream are supported, so it is very simple to replace them in the application code. Key features: Forward and backward seeks in compressed stream; Read and write any portion of data at any file position; OnProgress event handler and compression rate indicator; Password protection provided by Rijndael encryption algorithm; Fastest compression level is extremally fast. Created:  26/02/2002 by Mark Nelson More...
    www.programmersheaven.com/zone2/cat56/29935.htm

    Symbol Ranking Text Compression with Shannon Recodings

    InformationTheory area, Lossless area, Papers content rating: ***** by Peter Fenwick, Department of Computer Science, The University of Auckland.

    In his work on the information content of English text in 1951, Shannon described a method of recoding the input text, a technique which has apparently lain dormant for the ensuing 45 years. Whereas traditional compressors exploit symbol frequencies and symbol contexts, Shannon's method adds the concept of "symbol ranking", as in `the next symbol is the one third most likely in the present context'. Created:  19/01/2002 by Mark Nelson More...

    www.jucs.org/jucs_3_2/symbol_ranking_text_compression

    PICVideo Codec from Pegasus Imaging

    Lossless area, Video area, CommercialLibs content This software codec produces video in three different formats: Motion JPEG, Wavelet 2000, and Lossless JPEG. Created:  12/01/2002 by Mark Nelson More...
    video.jpg.com/

    Publications of Wojciech Szpankowski

    Lossless area, Papers content A good selection of papers online relating to pattern matching and compression. Created:  12/01/2002 by Mark Nelson More...
    www.cs.purdue.edu/homes/spa/publications.html

    Hirosuke Yamamoto's Papers

    Lossless area, BWT area, Coding area, Papers content This page has links to online versions of Hirosuke Yamamoto's papers on data compression. Papers here on block sorting, coding, and more. The papers are all published in English. Created:  01/01/2002 by Mark Nelson More...
    hirosuke.sr3.t.u-tokyo.ac.jp/files/DC.html

    SA-Comp/1 and SA-Comp/4 Data Compression SA

    Lossless area, Hardware content Cisco makes a box you can attach to their routers. The box performs lossless data compression. Created:  18/12/2001 by Mark Nelson More...
    www.cisco.com/univercd/cc/td/doc/product/core/7202/portadpt/service/sa_comp/

    Context Weighting for General Finite-Context Sources,

    Lossless area, Papers content by Frans M.J. Willems, Yuri M. Shtarkov, and Tjalling J. Tjalkens, IEEE Trans. Inform. Theory, Sept. 1996. A postscript version of this overview paper. Created:  17/12/2001 by Mark Nelson More...
    citeseer.ist.psu.edu/willems94context.html

    The Context Tree Weighting Method: Basic Properties

    Lossless area, Papers content One page poster for Frans M.J. Willems, Yuri M. Shtarkov, and Tjalling J. Tjalkens, "The Context Tree Weighting Method: Basic Properties," IEEE Trans. Inform. Theory, May 1995. (Postscript) Created:  17/12/2001 by Mark Nelson More...
    citeseer.ist.psu.edu/willems95context.html

    RICAZip.com

    ImageCompression area, Lossless area, CommercialLibs content, CommercialProgs content, Companies content rating: ***** RICAZip.com has proprietary lossless image compression technology called RICA (Reversible Image Compression Algorithm). RICA retains original file formats (e.g. TIFF, DICOM, BMP, TGA, PGM etc.). RICACom says We have yet to find any method that provides better compression ratios (for truly lossless), including wavelet. On a PII 450MHz RICA compresses @ 6MB per second and decompresses at 12MB per second.
    Available as a standalone image archive app, Adobe Photoshop Plugin, Browser Plugin, and RICA SDK.
    DCL reader Karen H. says: Evaluation of this product demonstates excellent compression ratios and it is also very fast compared to other methods I have used. Created:  15/12/2001 by Mark Nelson More...
    www.ricazip.com/

    Lossless Compression of Grayscale Medical Images - Effectiveness of Traditional and State of the Art Approaches

    ImageCompression area, Lossless area, Papers content The very long title of this PDF format paper pretty much obviates the need for any more description on my part. Created:  15/12/2001 by Mark Nelson More...
    www.dclunie.com/papers/spie_mi_2000_compression.pdf

    Code and Parse Trees for Lossless Source Encoding

    Lossless area, Papers content A survey paper by Julia Abrahams. Created:  10/12/2001 by Mark Nelson More...
    www.ims.cuhk.edu.hk/~cis/2001.2/Abrahams.pdf

    Standard ECMA-222 Adaptive Lossless Data Compression Algorithm

    Lossless area, Standards content This page has the standard publication that defines ECMA-222, which is also apparently known as ALDC. I don't know where this standard is used. Created:  05/12/2001 by Mark Nelson More...
    www.ecma.ch/ecma1/STAND/ECMA-222.HTM

    Standard ECMA-321 Streaming Lossless Data Compression Algorithm (SLDC)

    Lossless area, Standards content A standard. Created:  05/12/2001 by Mark Nelson More...
    www.ecma.ch/ecma1/STAND/ecma-321.htm

    M5 Online Compression Utility ver 1.0.1

    Compression area, Lossless area, NonCommercialProgs content The University of Central Florida has this web page which allows you to upload a file and then compress it using a wide variety of algorithms. Created:  29/11/2001 by Mark Nelson More...
    vlsi.cs.ucf.edu/upload.html

    Location Based Encoding - LBE

    Tutorials content, Lossless area, Coding area Chitaranjan P.S., Arun Shankar, and Niyant .K posted a description of a new coding scheme called LBE on the web. It's interesting, but I'm not sure that it appears to have any serious advantages over current state of the art. Created:  06/10/2001 by Mark Nelson More...
    in.geocities.com/iamthebiggestone/how_lbe_works.htm

    Compressed Virtual Memory

    Lossless area, NonCommercialProgs content Rodrigo Castro has an interesting project going at the University of Sao Paulo in Brasil. Rodrigo is integrating compression with the virtual memory system of Linux. By storing compressed pages in RAM, he hopes to improve overall system performance. The goal is to read and write fewer pages to disk. See the full details on his project page at SourceForge. Created:  03/10/2001 by Mark Nelson More...
    linuxcompressed.sourceforge.net/

    PackWord

    Lossless area, Esoterica area, NonCommercialProgs content PackWord can compress a Microsoft Word document (.doc) file into a smaller, compressed, .doc file. The compressed .doc file is self-extracting: when loaded into Microsoft Word, the compressed document will automatically expand to the original version. Created:  28/05/2001 by Mark Nelson More...
    www.packword.com/

    Lzip

    Lossless area, IncredibleClaims area, NonCommercialLibs content rating: ***** Lossy data compression which can reduce input files to 0% of their size. Hint: product was released April 1, 2000.
    DCL reader Tim A. marvels: Wow! it's even faster than tarring to /dev/null! Created:  08/04/2001 by Mark Nelson More...
    lzip.sourceforge.net/

    Eri32 High Performance Freeware Multimedia Archiver

    ImageCompression area, Lossless area, NonCommercialProgs content This web page shows a set of images that the author uses to demonstrate the performance of the Eri compressor. The claim is that Eri32 does better on these 24 bit color images than any other lossless compressor. Created:  08/04/2001 by Mark Nelson More...
    geocities.com/eri32/kodak.html

    M99

    Lossless area, BWT area, NonCommercialProgs content This page is devoted to a new compressor called M99. The author says that M99 is a new type of statistical compressor that has speeds rivaling the fastest Huffman coders with ratios of the best statistical modeling programs. Good! Created:  02/01/2001 by Mark Nelson More...
    geocities.com/m99dataCompression/

    Data Compression

    Tutorials content, Lossless area by Jack Ganssle. A quick look at lossless compression, including RLE, Huffman coding, and LZ techniques. Created:  30/08/2000 by Mark Nelson More...
    www.ganssle.com/articles/acompres.htm

    Introduction / Lossless Data Compression

    Tutorials content, Lossless area A web page that provides an overview of lossless techniques. Created:  30/08/2000 by Mark Nelson More...
    www.vectorsite.net/ttdcmp1.html

    Introduction to Data Compression

    Tutorials content, InformationTheory area, Lossless area A set of slides, maybe to accompany a lecture. Covers basic info theory and data compression. Created:  30/08/2000 by Mark Nelson More...
    www.ifi.uio.no/~ftp/publications/cand-scient-theses/SHuseby/html/node41.html

    TIFF Software

    Lossless area, SourceCode content, Papers content rating: ** A collection of free TIFF software. This may help you decode files in TIFF format. Includes some documentation files. Created:  20/08/2000 by Mark Nelson More...
    ftp://ftp.sgi.com/graphics/tiff/

    Lossless Data Compression

    Tutorials content, Lossless area, Links content rating: **** An overview of the topic by Nam Phamdo, with some basic definitions, plus a look at Huffman coding and LZ78/LZW coding. Created:  29/07/2000 by Mark Nelson More...
    www.data-compression.com/lossless.html

    Intelligent Compression Technologies

    Lossless area, CommercialLibs content, Companies content A company that speciailizes in providing compression technology to other companies. Created:  15/07/2000 by Mark Nelson More...
    www.ictcompress.com/

    Cisco V.44 Press Release

    Lossless area, Standards content Cisco talks a bit about new products using V.44 compression licensed from Hughes Network Systems. A few claims, not much in the way of facts. Created:  14/07/2000 by Mark Nelson More...
    www.cisco.com/warp/public/146/pressroom/2000/jul00/sp_071100.htm

    ITU V.44 Standard Adopted

    Lossless area, Standards content rating: **** The ITU has officially adopted the v.44 standard, which is starting to ship in mid-2001 on modems supporting the v.92 standard. V.44 uses a compression algorithm known as LZJH, which was invented by Jeff Heath and is owned by Hughes Network Systems. According to Jeff, ITU testing showed that V.44 was 20% to 60% better than V.42bis on typical internet web downloads. Created:  11/07/2000 by Mark Nelson More...
    www.itu.int/newsroom/press/releases/2000/14.html

    Craig Nevill-Manning

    Lossless area, Papers content Links to several publications related to data compression and pattern matching. Created:  04/07/2000 by Mark Nelson More...
    sequence.rutgers.edu/~nevill/

    Home Page of Martin Cohn

    Lossless area, Papers content Martin Cohn's home page contains links to several of his compression papers, which seem to be concentrated on lossless compression issues. Created:  02/07/2000 by Mark Nelson More...
    www.cs.brandeis.edu/~marty/

    ServerZip

    Lossless area, CommercialProgs content Stonebroom makes a product called ServerZip that compresses ASP web pages for quicker download. Created:  08/06/2000 by Mark Nelson More...
    www.stonebroom.com/sware.htm#srvzip

    MaX Compression

    Lossless area, CommercialProgs content This product compresses email before transmission to save network bandwidth. Created:  08/06/2000 by Mark Nelson More...
    www.c2c.com/compress.htm

    Data Compression Links from Epsilon Coder

    Lossless area, Links content Links that mostly point to some papers and source code, concentrating on lossless LZ type compression. Created:  03/06/2000 by Mark Nelson More...
    www.cs.pdx.edu/~idr/compression/

    Data Compression Technology by Compris.com

    Lossless area, Companies content These folks appear to be selling some lossless compression technology, but I'm not quite able to determine what it is. Created:  03/06/2000 by Mark Nelson More...
    www.compris.com/Densifier/en/

    Geolytics

    Lossless area, Companies content This company appears to be in the business of packaging demographic data for research and commercial interests. As part of that, they apparently have some technology for perfor