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January 2007
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2007.02.01 18:17 "Re: Interpreting SubIFDs tag", by Phil Harvey
> Here is the document that invented the SubIFD concept -- this is the > "Tiff Trees" approach. > (http://partners.adobe.com/public/developer/en/tiff/TIFFPM6.pdf) To quote this specification: "If there is more than 1 child image for a given parent image, the NextIFD value of Child #1 must point to Child #2, and so on. The last Child’s NextIFD value must be zero." I should point out that Adobe themselves don't store multiple SubIFD's like this. The current version of the Adobe DNG converter writes multiple SubIFD's by storing a separate pointer for each in the SubIFD tag (and each SubIFD has a zero NextIFD pointer). But this is definitely not the first time that Adobe has ignored their own specification. - Phil