2002.03.05 15:38 "Re: 16 bit LAB in TIFF - documentation update", by Martin Bailey
This is the official update for 16 bit LAB data in TIFF files, part of the documentation update coming out with the Photoshop 7 SDK.
I'm afraid I'm going to abuse your generosity also. But this is a draft, so picking up problems is good, right?
- The numeric range values for a* and b* conflict with the description - if you multiply the max 8 bit values by 256 as described, you don't end up with the numbers given.
- Why does the WhitePoint tag not apply? How do you figure out whether a Lab encoded file is D50, or D65, or anything else come to that. I never understood that statement in TIFF 6. Mart� Maria reads TIFF6 as stating that Lab data must be D65, but it only says that is generally used.
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