Graphics Interchange Format (GIF)
Specifications: http://www.w3.org/hypertext/WWW/Graphics/GIF/spec-gif87.txtPortable Network Graphics (PNG)
Archive: swrinde.nde.swri.edi:/pub/pngPNG-related web pages, including the PNG specification, are available at the following URL: http://quest.jpl.nasa.gov/PNG/
Incoming: swrinde.nde.swri.edu:/pub/incoming/png
Trouble: ksp@swri.edu
JPEG
FAQ: http://www.cis.ohio-state.edu/hypertext/faq/usenet/jpeg-faq/faq.html