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From: "Joris" <joris.at.lebbeke@skynet.be>
To: "Steven Woody" <narkewoody@gmail.com>, "libtiff" <tiff@lists.maptools.org>
References: <877jf1n4kg.fsf@narke.yellow.line>
Subject: Re: [Tiff] tiff unknown field of tag
Date: Thu, 4 Aug 2005 17:10:56 +0200
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Status:   

Steven,

> i got back some scaned tiff's from a photo lab. openning with xv or gimp
> just got a warning message: unkown field of tag 34665(0x8769). i want to know
> what's wrong with thoese files and how do a work around.

The warning is to be regarded as quite harmless. Any unknown (private) tag will
generate that warning, but by definition, a private tag should not contain
crucial data if the image is proper TIFF intended for interchange.

> 1. what means "ICC Profile: <present>" ? and what is ICC ?

There's a tag directory you can consult, with a search page that responds to the
decimal tag code or even search query like 'icc' or any somesuch:

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

The ICC Profile tag page that you can thus find contains a short decription,
which in this particular case is pretty useles for you, as well links to the ICC
specification and the mother of all open source ICC (color management)
libraries.

http://www.color.org/ICC1-V41.pdf
http://www.littlecms.com/

> 2. i noticed this file is uncompressed. so what's the benefit the lab save
>    result in tiff rather than a bmp?

I wouldn't know where to start, all depends on your application which of many
dozens of advantages, and dissadvantages, that are relevant for you. Perhaps you
may find the short introduction to the format in the TIFF FAQ useful:

http://www.awaresystems.be/imaging/tiff/faq.html#q1


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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