IM 6.7.6.6 Mac OSX Snow Leopard.
I don't know if this has been reported already, but converting an RGB image to CMYK and separating channels shows the black channel to be in color.
convert mandril.jpg -colorspace CMYK -separate miff:- | convert -delay 50 - -loop 0 mandril_cmyk_anim.gif
possible bug cmyk separation IM 6.7.6.6
Re: possible bug cmyk separation IM 6.7.6.6
We can reproduce the problem you posted and have a patch. Look for it in ImageMagick 6.7.6-7 Beta by sometime tomorrow. Thanks.