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From: Phil Harvey <phil@owl.phy.queensu.ca>
Subject: Re: [Tiff] Interpreting SubIFDs tag
Date: Wed, 31 Jan 2007 14:24:16 -0500
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Status:   

I just scanned my set of test images.  Unfortunately I don't have a  
sample where the next IFD pointer is used in the SubIFD.  However, I  
did note there are a number of images where the next IFD pointer is  
not even written for Interop and Exif IFD's (ie. not zero but not  
meaningful either).  So it looks like one should ignore the next IFD  
pointer for these IFD's.

So my question is:  For what IFD's is the next-IFD pointer  
meaningful? (IFD0 obviously, SubIFD apparently, but what is the  
official word on Interop and Exif IFD's, and what about GlobParam and  
GPS IFD's?)

TIA.

- Phil

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