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From: "Joris" <joris.at.lebbeke@skynet.be>
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        "Andrey Kiselev" <dron@ak4719.spb.edu>, <tiff@remotesensing.org>
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Subject: Re: [Tiff] TIFF Pyramid
Date: Mon, 13 Dec 2004 13:32:59 +0100
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I wrote:
> In the first image IFD, the SubIFDs tag is set with value
> 3, and that yields a file with one main (biggest) image and 3 downsample
> SubIFDs. If I change the value 3 of the SubIFDs tag to e.g. 2, it works as
> expected, one main image is written, 2 SubIFDs are linked to that main image,
> and the last is again written as a top-level IFD.

I just noticed, it doesn't actually produce a SubIFD chain, but a SubIFD array.
Meaning, the first SubIFD doesn't point to the second etc, but all SubIFDs are
directly pointed to from the SubIFD tag.

I do think that's uncommon, but it's valid, I think, according to the
specification supplement that described SubIFDs tag.



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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