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Date: Thu, 13 Jan 2005 10:48:47 -0600 (CST)
From: Bob Friesenhahn <bfriesen@simple.dallas.tx.us>
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To: Claude Houle <CHoule@mediagrif.com>
cc: "libTIFF (E-mail)" <tiff@remotesensing.org>,
        Joris <joris.at.lebbeke@skynet.be>
Subject: Re: TIFF - Unknown field with tag 34665 ( Part 3 )
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On Thu, 13 Jan 2005, Claude Houle wrote:

> Hi all,
>
> My first problem was due to CMYK Colorspace Problem and was easily fixed
> thanks to the clear insights of Mr. Jorris. Yet I have another problem which
> I cannot seem to find what it is. And perhaps you will be able to see the
> problem when you see the pictures. Unfortunately, the pictures are pretty
> big, and there is a 40K Limit to the mailing list ( Believe I tried... ).
>
> I uploaded a ZIP File to my personnal home page (
> http://www.darkwanderer.org/files/Sample2.zip ) which contain all the
> evidences gathered so far.
>
> The zip file contain :
>
> 1- The Original Adobe TIFF Image
> 2- A Screenshot from IMDisplay in action for  the TIFF File. ( You will see
> the picture degradation )
> 3- A Screenshot from GIMP ( What the picture should look like in IMDisplay )

ImageMagick and GraphicsMagick have a bug.  No doubt about it.  Your 
image uses 7 samples per pixel and IM/GM are mis-handling the extra 
samples.

Maybe you can use tiffcp to produce a TIFF containing just 4 samples 
per pixel so that ImageMagick loads it more correctly.

Bob
======================================
Bob Friesenhahn
bfriesen@simple.dallas.tx.us
http://www.simplesystems.org/users/bfriesen
