Given how manufacturer document these formats, we have to reverse-engineer or use documentation issued from reverse engineering.

Implementation

• dcraw the current reference implementation for RAW decoding.
• jrawio a Java library that implements RAW image decoding
• exifprobe and Exiv2 that decode several raw files

Processing

• rawness, digital photography science explain the science of raw processing and other. Very informative. (also in Spanish)

File format

• RAW file standards try to match current standard with currently undocumented file formats and its summary.
• TIFF on which DNG and apparently other RAW format are based on.
• Adobe DNG a "standard" format that Adobe tries to push.
• X3F Foveon, the Foveon partial documentation.
• MRW Minolta RAW
• RAWpository archive of sample image data in RAW formats