Title: Ho to Darken or Lighten TColor
function TMainForm.ChangeColor(InputColor: TColor; Lighten: Boolean; n: Extended): TColor;
var
r,g,b: extended;
begin
// Grab RGB values
r := GetRValue(InputColor);
g := GetGValue(InputColor);
b := GetBValue(InputColor);
// Do the operation
if Lighten = True then
begin
r := r+((r/255)*100);
g := g+((g/255)*100);
b := b+((b/255)*100);
end else
begin
r := r-((r/255)*100);
g := g-((g/255)*100);
b := b-((b/255)*100);
end;
// Check whether result is in range
if r 255 then r := 255;
if r 0 then r := 0;
if g 255 then g := 255;
if g 0 then g := 0;
if b 255 then b := 255;
if b 0 then b := 0;
// Send it out
Result := RGB(byte(Round(r)),byte(Round(g)),byte(Round(b)));
end;