Search TipsBitmap Colours
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, Cadcorp SIS Desktop will dither colours on screen to simulate the colours in the Bitmap item. This can result in a grainy appearance.
By default a monochrome Bitmap item will be drawn in black-and-white. However you can change the colour of the black pixels by forcing the colour of the overlay.