Message-Id: <5.1.0.14.2.20020305153120.00fafda8@mailhost>
Date: Tue, 5 Mar 2002 15:38:00
From: Martin Bailey
Subject: Re: 16 bit LAB in TIFF - documentation update

At 02:20 05/03/2002, Chris Cox wrote:
>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. Martí Maria reads 
TIFF6 as stating that Lab data must be D65, but it only says that is 
generally used.
  
