procedure ColorToGrayscale(Dst, Src: TCustomBitmap32; PreserveAlpha: Boolean = False);
Calculates color intensity from Src and writes it as a grayscale image into Dst. The alpha channel in Dst will be set to $FF by default. However, you can override this behaviour by setting PreserveAlpha to True.
This function supports in-place operation, that is Dst may be the same as Src.
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