Compressed Image File Formats: JPEG, PNG, GIF, XBM, BMP by John Miano

"Compressed Image File Formats is an appealingly compact and useful guide to some of today's most popular file formats used for image data. For any programmer who needs to know how images are stored, this concise reference can serve as a really invaluable resource."

Note that the source code for this book includes an independent implementation of a PNG codec, which may be one of a kind. Link to the source code on this page.