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From: "Joris" <joris.at.lebbeke@skynet.be>
To: "Ross A. Finlayson" <raf@tiki-lounge.com>,
        "Tiff mailing list" <tiff@remotesensing.org>
References: <200408200818.i7K8Ikxg015200@whale2.fsr.net>
Subject: Re: [Tiff] Tiff conversion using libtiff
Date: Fri, 20 Aug 2004 10:56:55 +0200
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Ross,

> Here is a section of the code in the tiff2pdf.c file that checks when
> the PhotometricIntepretation field is RGB that the number of samples is
> 3, for Red, Green, and Blue:

Presumably, PhotometricInterpretation = RGB and SamplesPerPixel = 1 could even
be a valid combination, if and only if the Indexed tag is also present. See

http://partners.adobe.com/asn/developer/pdfs/tn/TIFFPM6.pdf#page=11

or

http://www.awaresystems.be/imaging/tiff/tifftags/indexed.html

I must admit I have never seen such 'Indexed' image in the wild, so I'm looking
forward to a tiffinfo or whatever tag dump. Note that it might not be a good
idea to fool LibTiff into thinking PhotometricInterpretation = Palette without
checking for presence of Indexed first.

> Hey I've been developing Yet Another TIFF Tag Viewer

Cheers!

> I've
> noticed that on Joris' web page there are still yet a few private tags
> that I did not know of, see
> http://www.awaresystems.be/imaging/tiff/tifftags.html .

Likewise, your list contains a lot that I didn't yet have any data on.

And thanks for the pointer. Indeed, since yesterday, a 'TIFF Tag Reference' is
on-line. Anyone with remarks, thoughts, wishes, or willing to submit
specifications on private tags, should contact me at joris.at.lebbeke@skynet.be.


Have a nice day,

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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