Legacy ImageMagick Discussions Archive

Using IM 6.9.8.3 Q16 this works fine to change only the red channel:

convert logo: -channel r -fill "gray(200)" -opaque "gray(255)" +channel tmp.png

But the same fails in IM 7.0.5.4 Q16 --- it seems to affect all channels:

magick logo: -channel r -fill "gray(200)" -opaque "gray(255)" +channel tmp.png

Mac OSX SnowLeopard

(Workaround is to separate channels, process, then combine. But should not IM 7 work the same as IM 6 in this case?)

Confirmed using v6.9.5-3 and v7.0.3-5 on Windows 8.1.

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 @ http://www.imagemagick.org/download/beta/ by sometime tomorrow.

This issue seems to be fixed in the latest beta as of today. (6.9.8.5 and 7.0.5.6)

[resolved] possible bug -channel IM 7