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Darkness

procedure Darkness( Bitmap:TBitmap; Amount: integer);
var
Wsk:^Byte;
H,V: Integer;
begin
  Bitmap.pixelformat:=pf24bit;
  for V:=0 to Bitmap.Height-1 do begin
    WSK:=Bitmap.ScanLine[V];
    for H:=0 to Bitmap.Width*3-1 do
    begin
    Wsk^:=IntToByte(Wsk^-(Wsk^*Amount)div 255);
    inc(Wsk);
  end;
 end;
end;
to image delphi effect darkness by drs on May 07, 2007
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