On Mar 12, 2005, at 8:07 AM, Frantisek wrote:
GD> add them to the sensor data. Optional processing that can be done on
GD> the RAW format file is compression (stripping unused bits, packing and
GD> lossless compression operations to reduce the file size), but otherwise
Well written Godfrey!
I would just add that what processing is done on RAW files is usually not disclosed by the manufacturer. Some Nikon's cameras RAW compression is not really lossless, it's probably lossy (though nobody knows exactly). Some Canon's cameras have RAW files sharpened internally without user's option or telling him. God knows about Pentax ;-)
I'm not sure about the Nikon compression. On the Canon, my understanding was that the sharpening is applied as constants in the metadata, and should be undoable.
Yeah, who knows what Pentax does, but I'd say Pentax likely does very little given that they didn't even do bit stripping in the D and do in the DS...
Godfrey
