Loads two different images: - the 1st is the RGB channels - the 2nd is interpreted as greyscale and fetch in the alpha channel of the result. The returned OwnedImage!RGBA should be destroyed with destroyFree.
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Loads two different images: - the 1st is the RGB channels - the 2nd is interpreted as greyscale and fetch in the alpha channel of the result. The returned OwnedImage!RGBA should be destroyed with destroyFree.