Graphics for Inclusion in Electronic Documents
   Essay on how to produce portable graphics files that can be imported into other documents, especially TeX. The advice is aimed mostly at linux or similar operating systems which have a wealth of open-source command-line tools. Also includes guidelines for
   http://silas.psfc.mit.edu/elec_fig/elec_figures.html

Image File Formats
   Listing of image formats and their associated file extensions.
   http://www.fileinfo.net/filetypes/image

Image Formats
   Information about seven common web image formats.
   http://www.image-formats.com/

The Graphics File Format Page
   Specifications for various graphics file formats along with some source code and utilities.
   http://www.martinreddy.net/gfx/

The Unofficial Photoshop Color Book File Format
   Adobe Photoshop stores color books in a native format with the file extension .acb on PCs and 8BCB file types on Macs. This is an unofficial documentation of the specification.
   http://www.magnetiq.com/docs/PhotoshopColorBook.txt

W3C Overview of Web Graphics
   Information from the World Wide Web Consortium on format comparisons, integration into HTML and XML.
   http://www.w3.org/Graphics/