See IM Examples Bugs...
http://www.imagemagick.org/Usage/bugs/testing/
Combine with other color channels, and ColyBlack from an RGB greyscale image
are broken.
I have reported this, as shown by the above page, but it helps for others who need these features to also report a problem. It will get fixed faster that way.
Obtaining Pure black text in CMYK
- anthony
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Re: Obtaining Pure black text in CMYK
Anthony Thyssen -- Webmaster for ImageMagick Example Pages
https://imagemagick.org/Usage/
https://imagemagick.org/Usage/