On Aug 19, 2004, at 4:25 PM, Ken Lin wrote:
Assuming each pixel took one byte to store its' content, then there are 2 MB
worth of additional information on top of the 6.2 megapixels of RGB
information in each RAW file ? I would not likely think so (personal
opinion here only). I don't know how much storage would EXIF or any other
related information are in a RAW file, but surely these additional
information couldn't take up 2 MB worth?? (coincidentally this would have
taken one and half 3.5" floppy diskettes to store, remember those plastic
square things?)
A couple things; first, there's a byte and a half (12 bits) worth of data per pixel in the raw file, not just 1 byte worth. With the D60 (and 10D/300D?), there's also a half-size JPEG hiding in there. The RAW image data is slightly compressed in the .CRW file, but not all that much. If I remember correctly, the top 10 bits are compressed with something ZIP-like, while the bottom 2 bits are kept as-is, because they're too noisy to compress much.
Scott
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