Colour Reduction & Conversion

[Monkey King]

Does anybody have a neat and nifty way of converting a bitmap to a color palette consisting of three system colours, e.g. system highlight, background and shadow.

I want to use the bitmaps as backdrops for forms but in such a way as they blend into the existing color scheme.

Cheers

[oetje]

Memory is cheap, so more and more people run windows with more then 256 colours. So there aren't any color palettes on most systems.

[Monkey King]

Without getting hooked up in semantics, I meant "the colour palette" as defined by the bitmap itself. Using a reduced colour range. As long as I know the range of colours used it should be possible to mask through each pixel and convert their colour to one in a suitable range.