The Resample method should change the DPI. If you want to change it from 72 to 200 you should call it with 200,200. It does not use doubles because Magick++ also not do that. This seems like something I will have to fix in ImageMagick and Magick.NET because the density is a double instead of an integer in MagickCore. I will create a work item for this and work on this next week when I am back home.
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