2012.02.10 15:15 "Re: [Tiff] Versioning and Forks of LibTiff", by Bob Friesenhahn

What is the relationship between this LibTiff and the LibTiff from Aperio (http://www.aperio.com/bigtiff/)?

It is very confusing because the version numbers and the release dates are pretty much the same.

Is the code the same and just the versioning different? Or is it a real "fork" with different code bases? Is the one from Aperio "newer" or has more features (because they are at version 4.1 and LibTiff at version 4.0)? Is there a reason to choose one library over the other?

The page you reference at Aperio seems pretty clear. Aperio libtiff forked from libtiff in 2007, starting with libtiff 3.8.2 code. The code is obviously not the "same" although Aperio libtiff is free to pick up any improvements from libtiff.

I'm currently trying to understand an issue where I get BigTiff data which was generated by a version "4.1" of libtiff and I'm experiencing problems because of duplicated StripOffset tags, which prevents the file from working with ImageJ.

Would it be possible that the problem disappears when I switch to the "other" fork?

It is certainly possible that using Aperio libtiff will help when reading TIFF files written by Aperio libtiff.

If there is some issue with Aperio libtiff then you should report it to the developers of Aperio libtiff.

Bob
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Bob Friesenhahn
bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/