CMYK jpegs' colors are not read correctly.

http://musicbrainz.org/release/35bc7d37-1a88-4c82-805b-dc530f0115db/cover-art

CMYK original: http://coverartarchive.org/release/35bc7d37-1a88-4c82-805b-dc530f0115db/6093149408.jpg
RGB self-converted: http://coverartarchive.org/release/35bc7d37-1a88-4c82-805b-dc530f0115db/6093156024.jpg

The thumbnail for the CMYK image is saved in RGB colorspace but with the wrong colors:
http://ia700501.us.archive.org/2/items/mbid-35bc7d37-1a88-4c82-805b-dc530f0115db/mbid-35bc7d37-1a88-4c82-805b-dc530f0115db-6093156024_thumb250.jpg (thumbnail for the self-converted RGB jpeg)
vs.
http://ia700501.us.archive.org/2/items/mbid-35bc7d37-1a88-4c82-805b-dc530f0115db/mbid-35bc7d37-1a88-4c82-805b-dc530f0115db-6093149408_thumb250.jpg (thumbnail for the CMYK image is saved with wrong colors into RGB colorspace)