Each Bitmap has a Colour depth property. This determines the maximum number of different colours available for each pixel. Common colour depths are 1-, 4-, 8-, 16- and 24-bits, corresponding to 2, 16, 256, 65000 and 16.7 million colours.
If the colour depth of your screen is less than the colour depth of a Bitmap item, then SIS will dither colours on screen to simulate the colours in the Bitmap item. This can result in a grainy appearance.
If you have a monochrome Bitmap item, then it will draw in black-and-white by default. However you can change the colour of the black pixels by forcing the colour of the overlay it is on.
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