Dear Maintainer,
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Debian 8, up today
Open any image with GIMP. Go to "export as" and select a tif extension. Use LZW
compression. File is created but it is corrupted/distorted. The same problem
has been discussed here <https://forums.opensuse.org/showthread.php/506050
-GIMP-export-TIF-format-problems>
GIMP version 2.8.14-1+b1
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I have also encountered this bug. Debian 8; Linux 3.16.0-4-amd64 libtiff5 4.0.3-12.3 gimp 2.8.14-1+b1 GIMP with libtiff5 exports uncompressed TIFF images correctly. However, if LZW or Deflate compression is selected, the resulting image gets corrupted. PackBits compression seems to work just fine. To reproduce, first open the file flower-uncompressed.tif in GIMP 2.8.14: http://bit.ly/1O8bZFv Export the image as a new TIFF file, using either LZW or Deflate compression method. Open the resulting image in GIMP. It will look like flower-lzw.tif here, when obviously it is supposed to be a pixel-perfect copy of the original, only a smaller file. http://bit.ly/1ISUx0G In another system running Debian 7 with gimp 2.8.2-2+deb7u1 and libtiff4 3.9.6-11, there was no problem with LZW export. I never tried Deflate there.
I tested this with GIMP 2.8.10 in Ubuntu 14.04, where the libtiff5 package is version 4.0.3-7ubuntu0.3. Both LZW and Deflate worked fine, so it seems the bug has appeared between 4.0.3-7 and 4.0.3-12.3. However, the inner workings of libtiff5 are beyond my understanding.
The reason why the bug didn't appear in 4.0.3-7ubuntu0.3 seems to be that they disabled the patch that fixed CVE-2014-8128. https://bugs.launchpad.net/ubuntu/+source/tiff/+bug/1439186
Is there a workaround for this bug? I'm running into trouble creating a figure for a paper, for which I have a short time limit. :(
I can't see any easy workaround other than, obviously, not using LZW compression. However, the problem seems to have been fixed in libtiff 4.0.5. Now there's also 4.0.6, which I haven't tried: http://download.osgeo.org/libtiff/ You need to build and install the new version and make sure GIMP (or whatever software you're using) sees it instead of the buggy 4.0.3. Now LZW seems to work.
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Dear maintainer, would it be possible to pull testing's 4.0.6 version to stable? It seems to work fine in a Jessie environment, as I figured out when I installed 4.0.6 after 4.0.3 had ruined some 48 bit scans... Cheers -- Torsten
Dear maintainer ! I can confirm that installing the debian Stretch version (libtiff5_4.0.6-2_amd64.deb) fixes the problem on Jessie. Regards, Karl Kashofer
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This bug should be closed with libtiff 4.0.3-12.3+deb8u3 I have tested the conversion of several images to tif with lzw compression, and the pictures are writte correctly.
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