```-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Some help through Palette Hell... -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Writer: Matthew River Knight Coders using SCREEN 13 often find it necessary to check within the VGA palette to see which RGB values will most closely match any given RGB values. Ideally, we could use a formula to solve this problem for us. Say, for example, I wanted to find the closest match for 62;10;6, our formula might find something like 60;10;6. Fortunately for us, such a formula does exist. To tell how 'far' one color is from another, just use the distance formula: Distance = SQR((R2-R1)^2 + (G2-G1)^2 + (B2-B1)^2) The two colors are R1,G1,B1 and R2,G2,B2. Of course you don't necessarily *have to* have a square root if you only want to find the closest match for a color in an array. Just use its normal. Here's an example: Let's say we want to find the closest match for the color (R,G,B) in the R(),G(),B() array, which contains 16 colors. This is commonly used in dithering. Here's some example code: Distance = 32767 FOR A = 0 TO 15 RD = R(A)-R GD = G(A)-G BD = B(A)-B Normal = RD*RD + GD*GD + BD*BD IF Normal ```