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source bitmap color key

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why the color key does not work when I change the pixel attributes from 16 to 32 on my notebook. It shows a white background instead of a transparent background that I get with 16 bit color attribute. Thanks Love is illusion. Hate is real. I would rather be crazy.

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Because the color value is different in 32 bit. For exapmle, the white color is 0xffff in 16 bit and 0x00ffffff in 32 bit.

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what you are saying makes sense, however when I use the 32 bit values for white 0x00ffffff I still get the white back ground compared with the transparent I get when I set the attributes to 16.

Where can I read more about this subject?

thanks

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