Questions and postings pertaining to the usage of ImageMagick regardless of the interface. This includes the command-line utilities, as well as the C and C++ APIs. Usage questions are like "How do I use ImageMagick to create drop shadows?".
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When you rotate the image other than 90 degrees you are introducing transparency which caused the image to saved slightly differently. You may want to force a compliant BMP image by saving with a bmp3 prefix. For example, use the filename `bmp3:image.bmp'. The prefix forces the BMP image to be a type that your BitBlt() method may be more ameniable to.