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TIF Alpha+LZW conversion problems

https://magick.imagemagick.org/viewtopic.php?t=7388

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TIF Alpha+LZW conversion problems

Posted: 2006-09-13T06:49:31-07:00
by dargaud
I have a problem when converting TIF images using LZW compression that also contain an alpha channel. The result is garbage...
Examples of conversion:

convert 20060831-SergentVPano_LZW.tif jpg:20060831-SergentVPano_LZW.jpg
convert 20060831-SergentVPano_Packbits.tif jpg:20060831-SergentVPano_Packbits.jpg

As you see on the sample images, packbit compression works fine.
Image

Posted: 2006-09-13T07:16:45-07:00
by magick
The conversion worked fine for us. We're using ImageMagick 6.2.9-5, the current release.

Posted: 2006-09-13T07:56:02-07:00
by dargaud
Sorry, I forgot the version number: 6.0.4-1 which is the most recent Cygwin version.

Posted: 2006-09-13T15:58:40-07:00
by dargaud
Downloaded and compiled latest version. Works fine now. Thanks. I should give feedback to the cygwin folks instead.
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