made a red/cyan color anaglyph, andcomposite -stereo 0 %~2 %~1 %out%
made a grayscale one.composite -stereo 0 %~2 -colorspace gray %~1 -colorspace gray %out%
But in IM 7 the same lines (prefixed with magick) make all-red images.
Did I miss a documentation update, or is something broken?