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Subject: RE: [Tiff] Color TIFF/JPEG compression questions
Date: Mon, 2 May 2005 13:48:48 -0500
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Thread-Topic: [Tiff] Color TIFF/JPEG compression questions
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From: "Frank, Jason" <JasonFrank@srcp.com>
To: "Joris" <joris.at.lebbeke@skynet.be>, <tiff@remotesensing.org>
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Status:   

You're right, I was testing with the quad-jpeg-rgb.tif file.  Please
accept my apologies.

-----Original Message-----
From: Joris [mailto:joris.at.lebbeke@skynet.be] 
Sent: Monday, May 02, 2005 1:44 PM
To: Frank, Jason; tiff@remotesensing.org
Subject: Re: [Tiff] Color TIFF/JPEG compression questions

Jason

> So, I think that tiffinfo might be playing correctly here (since it 
> agrees with tiffdump, and I don't see any obvious problems with the
> code.)

We should check that we are talking about the exact same quad-jpeg.tif.
I know for a fact that AsTiffTagViewer shows exactly what is there, and,
unlike LibTiff, that stuff isn't burdoned with an actual image decoder
part and a subsampling-fixup scheme and such... So if AsTiffTagViewer
doesn't mention the tag, and tiffinfo does, I know for a fact that
tiffinfo must be wrong.

A newer version of AsTiffTagViewer that isn't published yet, also
supports hex viewing of just about any structure in a TIFF file. With
this version I was able to triple-check, and sure enough, the tag count
of this IFD shows as 14 in a hex dump that is merely a hex dump and
cannot possibly be wrong. 14 is the number of tags shown by both
versions of AsTiffTagViewer. So tiffinfo *does* add the default or
fixed-up or whatever values of YCbCrSubsampling even though the tag is
*not* there.

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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