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for some complex and large assemblies, it takes hours to create tiff files for drawings, how shall we reduce the time required to form these tiff files?
I am not sure I have understood your question 100%. Are you trying to find a fast tiff image creator library or you want to accelerate the image processing rate with same library? Hope following post can give you some information.
http://stackoverflow.com/questions/228545/on-ghostscript-fastest-way-to-create-a-blank-tif-document