JPEG JFIF
The W3C page on the image/jpeg file format is brief, but it has links to two PDF files documenting the JPEG FIle Format, the standard way to contain images compressed with the JPEG mechanism.
The W3C page on the image/jpeg file format is brief, but it has links to two PDF files documenting the JPEG FIle Format, the standard way to contain images compressed with the JPEG mechanism.
An organization (or individual?) that provides improvements to jpeg manipulation tools, such as tweaking the ILJ 'cjpeg' compressor to allow different compression quality settings on different channels.
The comp.graphics.misc frequently asked questions list, with answers, about JPEG compression and JFIF files. Last modified in 1999, some of the questions are quite dated, but many are still relevant.
A good non-mathematically introduction to the technical aspects of JPEG compression, with lots of illustrations of what different settings do to images.
dead link: http://www.photo.net/learn/jpeg/
A page I made extolling the virtues of the Portable Video Research Group JPEG implementations. This is an old and obscure tool that I feel needs more recognition.