Re: Submit Patch

> http://www.lis.ic.unicamp.br/~tiago/ImageMagick/parallel_SetImageChannelDepth.patch

Instead of making q private, change lines like q->red to (q+x)->red.
Don't forget to delete the q++ statement.  With this change, q_original
is not needed.  It may run in the same time as your patch but it seems
cleaner.  Try timing on both methods and see which is speeder.