Cannot save luminance bmp files...
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When an image is converted to luminance (8 bpp/1 Bpp)
it cannot be save correctly as a bitmap... Had a quick
look at the source and as far as I can tell it doesn't
contain any code for saving this format correctly...
See patch 2805446.
https://sourceforge.net/tracker/?func=detail&aid=2805446&group_id=4470&atid=304470