I made some improvements in function SetImageChannelDepth, using parallelism
via OpenMP.

My tests demonstrated that in average the new code is 43% faster in dual
cores (Intel C2D e6750)

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

Thanks

-- 
Tiago Rezende Campos Falcão
---------------------------------------------------
Laboratory of Information Systems
Institute of Computing
University of Campinas - UNICAMP
13083-970, Campinas, SP, Brazil
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