-compose CopyBlack

Post any defects you find in the released or beta versions of the ImageMagick software here. Include the ImageMagick version, OS, and any command-line required to reproduce the problem. Got a patch for a bug? Post it here.
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snibgo
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-compose CopyBlack

Post by snibgo » 2019-08-01T08:17:32-07:00

"-compose CopyBlack" inverts the black level. Test case:

Code: Select all

magick rose: -colorspace CMYK ( +clone ) -compose CopyBlack -composite -colorspace sRGB copyblk.png
Image

Tested with IM v7.0.7-28 on Windows 8.1.

It seems to be a bug in composite.c. See thread https://www.imagemagick.org/discourse-s ... =1&t=10322
snibgo's IM pages: im.snibgo.com

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magick
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Re: -compose CopyBlack

Post by magick » 2019-08-02T16:35:57-07:00

Thanks for the problem report. We can reproduce it and will have a patch to fix it in GIT master branch @ https://github.com/ImageMagick/ImageMagick later today. The patch will be available in the beta releases of ImageMagick @ https://www.imagemagick.org/download/beta/ by sometime tomorrow.

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