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December 2004
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2004.12.13 12:32 "Re: TIFF Pyramid", by Joris Van Damme
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