The problem with .bum file size is that they are uncompressed .bmp files. But, the other problem is that compressing .bum files (normal map) is not a good thing. At least lossy compression compromises data integrity in this case (remember these aren't 'images' per se, but data maps). I agree, though, that .bum files should become extinct. The issue here is that support must remain as long as they exist in content. What should be done is a permanent conversion to height map (bump map) with links fixed in the Poser file.

C makes it easy to shoot yourself in the foot. C++ makes it harder, but when you do, you blow your whole leg off.

 -- Bjarne Stroustrup

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