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From: =?iso-8859-1?Q?Mart=ED_Maria?= <marti@littlecms.com>
To: <tiff@olympiakos.com>, "Chris Cox" <ccox@adobe.com>
References:  <Pine.SO4.4.05.10202281344150.7937-100000@scooby.simplesystems.org> <p04320405b8a9d81a9d7b@[153.32.48.223]>
Subject: Re: 16 bit LAB in TIFF - documentation update
Date: Tue, 5 Mar 2002 10:05:01 -0320
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Hi Chris,

In first place I would like to thank both Adobe for this TN and you for
posting it here. Joris and me were struggling against several of those mutually
incompatible proprietary encoding, and for sure the Adobe note has been
clarifier.

I have still a couple of questions, which I'm sending to you abusing of your kindness.
I understand probably you didn't even wrote this, but as a Adobe representative you
are my best choice to get these ones answered.

a) A lot of experimentation did show me that Adobe is using D50 as white point. This
clashes with the D65 required by old spec. Which white point is supposed to be used?

b) About ICCencoding. Lately, ICC has released spec 4.0, with several major changes.
One of them that PCS L is no longer encoded as 0...ff00 but 0..ffff
I'm amazed by the side effects this would have in, for example, TIFF Lab. The note talks
about ICCLab with encoding 0..65280 But in current ICC spec PCS is encoded as 0..65535.

Please take these comments just as what they are. Not complains but only additional
clarifications . I'm very happy to have now the "canonical" guide to Lab TIFF

With Best Regards,
Martí Maria
The little cms project
http://www.littlecms.com
marti@littlecms.com


----- Original Message -----
From: "Chris Cox" <ccox@adobe.com>
To: <tiff@olympiakos.com>
Sent: Monday, March 04, 2002 11:00 PM
Subject: 16 bit LAB in TIFF - documentation update


> 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.
>
> This covers the existing CIELab encoding and the new ICCLab encoding.
>
>
> An RTF version of the documentation is attached.
> A formatted PDF (104K) can be found at
> http://www.chriscox.org/PhotoshopLABTIFF.pdf
>
> (Sorry I had to put it on my own website, but Adobe's website team
> was going to take at least another 4 weeks)
>
> Chris


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