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From: =?iso-8859-1?Q?Mart=ED_Maria?= <marti@littlecms.com>
To: "Joris Van Damme" <as.van.damme.joris@planetinternet.be>,
   "Dwight Kelly" <dkelly@apago.com>, <tiff@olympiakos.com>
References: <Pine.LNX.4.21.0110051822440.18017-100000@gate.apago.com> <003601c14e73$cbdbcdb0$02001aac@MM2000> <3BD889D0.F777CE11@planetinternet.be> <001f01c15e22$1e1e8460$02001aac@MM2000> <3BD95B0C.5D5DC94E@planetinternet.be> <004101c15e55$2c8c7c40$02001aac@MM2000> <3BD9749E.17F4D870@planetinternet.be>
Subject: Re: 16-bit ICC L*a*b* ?
Date: Fri, 26 Oct 2001 17:34:37 -0320
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Hi, 

On Fri, 26 Oct 2001, [iso-8859-1] Dwight Kelly wrote:
>There are two photometric tag values for Lab color in TIFF. 
>
>value 8 is defined as "1976 CIE L*a*b*"
>value 9 is defined as "ICC L*a*b"

That is!. Seems Dwight Kelly discovered the difference. I'm sending to you a 
small TIFF16 I have. It is labeled as Photometric 8. I'm pretty shure your big image 
is labeled as Photo=9. So, using ICC encoding. That is, an offset of  128 applied 
to a, b. Photo 8 is using the signed word way. Or at least that is what seems. 

Pfew!, if this is the case, seems I can avoid your 30Mb sample ;-)

Regards,
Marti.




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