Legacy ImageMagick Discussions Archive

I get strange artifacts when running "convert testRGB.jpg -quality 100 -colorspace CMYK testCMYK.jpg" the image is showing squares of slightly different colors on dark areas with the size of 16x16 pixels. Anyone know why and how to fix it?

I cannot reproduce that on IM 6.7.3.4 Q16 beta on Mac OSX Tiger.

You might post a link to your input image. Also you did not say what version of IM or what platform. If old version of IM, then consider upgrading.