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Subject: RE: Re[2]: [Tiff] Status of ISO JBIG and CIELAB JPEG support
Date: Tue, 26 Sep 2006 14:20:38 -0700
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From: "Chris Cox" <ccox@adobe.com>
To: "Jean-Yves Le Ridant" <jeanyves.leridant@wanadoo.fr>,
        "A Wandering LibTIFF User" <tifflist@r.paypc.com>
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Status:   


Wait, what?

Photoshop doesn't support ITULAB.
Photoshop only supports CIELAB and ICCLAB encodings in TIFF.

Chris



-----Original Message-----
From: tiff-bounces@lists.maptools.org on behalf of Jean-Yves Le Ridant
Sent: Tue 9/26/2006 10:53 AM
To: A Wandering LibTIFF User
Cc: tiff@lists.maptools.org
Subject: Re[2]: [Tiff] Status of ISO JBIG and CIELAB JPEG support
 

I agree with Joris that fax000003507.tif seems to be a well
formed ITULAB. ( from my materials and Photoshop ).

The linear rescale to apply to a and b to get "possible"
colors meet the spec. of ITULAB.

IMO, ( if I undestand and your main goal, if not only goal,
is read/write ITULAB Tiff ), it could far more easier and faster,
rather than expect have a libtiff processing LAB files,
of process yourself jpeg data stream, using the read/write
encoded data interface.

The add to Tiff Specifications for jpeg in tiff, well
explain the organisation of data against jpeg markers,
this meet of course well jpeglib requests and capacities,
and is not far complicated.

--
Jean-Yves


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