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.

-- jussi.hukka...@gmail.com
What if this weren't a hypothetical question?

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