TCampbell
Been spending a lot of time on here!
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Many camera maker Raw files are proprietary. The only open source Raw file type is DNG. Digital Negative - Wikipedia, the free encyclopedia
Some camera makers use DNG as their Raw file type. Nikon and Canon Raw file types are proprietary.
Adobe has to reverse engineer the proprietary Raw file type that each new model of camera has. The camera makers do not help Adobe do that.
Unlike TIFF, JPEG, several other image formats, RAW is more of a "concept" than a "file format". RAW says that the camera won't do anything to the image which results in a loss of original data. Compression is allowed as long as it's a non-lossy compression.
.CR2 files aren't just different than Nikon .NEF files... each specific camera model actually can have a different file format. There are actually LOTS of ".CR2" formats and updates are released all the time. Next year, Canon and Nikon will likely release some new camera that "this year's" software won't be able to read until the software is updated.