Bug with B&W conversion

Hi,

I'm getting lots of weird conversion corruptions with GraphicsMagick when I convert to B&W.

For example if I do the following conversion:

"c:\Program Files\GraphicsMagick-1.3.12-Q16\gm.exe" convert -monochrome -format tif -compress group4 original.tif error.tif

with the files found here:

error.tif = http://www.mediafire.com/?9g6g74m3t5eg4f5

original.tif = http://www.mediafire.com/?f65syy6gzdah45h

You will notice that error.tif comes out chopped in half.  Other images sometimes come out all white - but large (expanded - bloated) i.e. the Group4 TIF is larger than an uncompressed MONO BMP should be.

I had similar issues with ImageMagick so I moved across to GraphicsMagick as nobody could fix the bugs there.  GraphicsMagick seems to display fewer corruptions but still has the same issues.

Please let me know if you require further examples to reproduce this issue.

Thanks,

Andrew

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