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Thread-Topic: [Tiff] TIFF standards and technical notes
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From: "Sheila M. Morrissey" <Sheila.Morrissey@portico.org>
To: "Gerben Vos" <Gerben@ZyLAB.COM>,
	<tiff@lists.maptools.org>
Subject: Re: [Tiff] TIFF standards and technical notes
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Gerben, Thank you for this information. 
Rebards,
Sheila

________________________________

From: Gerben Vos [mailto:Gerben@ZyLAB.COM]
Sent: Tue 1/6/2009 5:51 AM
To: tiff@lists.maptools.org
Cc: Sheila M. Morrissey
Subject: Re: [Tiff] TIFF standards and technical notes



Whatever you do, please disregard section 22 of the TIFF specification
completely, and only use TIFF TechNote 2 (or apparently the Photoshop
TTN). Section 22 is self-contradictory and incomplete. libtiff has
reading and writing support for TTN2. After a lot of hard work and
reverse engineering, Joris van Damme has implemented read-only support
for TIFF variants created by the section 22 implementations that he
could find (and many of these were indeed incompatible amongst
themselves); this work has also been incorporated into libtiff, but it
should only be used if you really, really, really have to. Please don't
ever create new TIFF files based on section 22.

I don't know about section 21 or the details regarding YCbCr images,
sorry.

Regards,
                    Gerben Vos.


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