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Sometimes in run-time you need play with colors. For example, you have the some color value and you want to make it more dark or light. The next two function were written for it.

function Dark(Col: TColor; Percent: Byte): TColor;
var R, G, B: Byte;
begin
  R := GetRValue(Col);
  G := GetGValue(Col);
  B := GetBValue(Col);
  R := Round(R*Percent/100);
  G := Round(G*Percent/100);
  B := Round(B*Percent/100);
  Result := RGB(R, G, B);
end;

function Light(Col: TColor; Percent: Byte): TColor;
var R, G, B: Byte;
begin
  R := GetRValue(Col);
  G := GetGValue(Col);
  B := GetBValue(Col);
  R := Round(R*Percent/100) + Round(255 - Percent/100*255);
  G := Round(G*Percent/100) + Round(255 - Percent/100*255);
  B := Round(B*Percent/100) + Round(255 - Percent/100*255);
  Result := RGB(R, G, B);
end;

Published: December 30, 1999

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