[Magick-bugs] IM 6.3.9 - YUV combine broken or not implemented?

[duc.sequere.aut.de.via.decede at imagemagick.org]

> convert photo.jpg -colorspace YUV -separate yuv-channel-%d.png

The PNG image format does not support the YUV colorspace, instead it converts
non-RGB colorspace to RGB before the image written.  Try using an intermediate
image format that supports YUV such as YUV or MIFF.