2015.08.19 13:52 "[Tiff] Large files under Windows", by Bob Friesenhahn

2015.08.26 01:02 "Re: [Tiff] Large files under Windows", by Bob Friesenhahn

Please note that I have not actually tested the large file support. I have only verified compilation and that the libtiff test suite passes under MinGW 32 and 64-bit, 64-bit Cygwin, and 32/64-bit Unix systems.

I have now done some testing. I created a 25GB BigTIFF file using GraphicsMagick (using libtiff 4.0.4 and GraphicsMagick's own large file implementation). I then used 'tiffcp' compiled with 64-bit MinGW and -D__MSVCRT_VERSION__=0x800 to copy to a new file. Tests were run on tiffcp using tif_win32.c and tif_unix.c. A md5sum of the result computed the same between both implementations. I then extracted a rectangle from the huge image using GraphicsMagick and checked that it was an expected image.

I have not seen results from large image testing from anyone else. More testing is useful to make sure that the next libtiff release does not have unexpected issues.

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