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From: "Joris" <joris.at.lebbeke@skynet.be>
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Subject: Re: [Tiff] CIELAB/ITULAB
Date: Thu, 16 Dec 2004 21:09:48 +0100
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> So I extended the libtiff by the Decode tag and tried
PhotometricInterpretation=10
> (ITULAB) with the default values for Decode (taken from
> http://www.awaresystems.be/imaging/tiff/tifftags/decode.html). Unsurprisingly,
> some of the viewers refused the TIFF file but the rest showed the same wrong
> colors.

I misread part of this in previous reply, sorry.

Setting the tag with default values as a last resort does not have a great
chance to improve any compatibility of your files in any readers. After all,
readers that are ITULAB aware, are most probably either
a) ignoring the tag and using the defaults anyway
b) reading the tag, and thus using the same defaults

It would change something if some buggy reader was ITULAB aware in a buggy way,
and nevertheless solid enought to read and respect the tag. Not very likely.

Most readers are just not ITULAB aware. If you don't actually need the TIFFs to
be in that particular colorspace (understanding you correctly this time?) then
convert colorspace between jpeg reading and tiff writing, thus writing out TIFFs
in a much better supported space like even plain old RGB.

Joris Van Damme
info@awaresystems.be
http://www.awaresystems.be
Download your free TIFF tag viewer for windows here:
http://www.awaresystems.be/imaging/tiff/astifftagviewer.html

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