Fórum comparar duas imagens #176187

var
  b1, b2: TBitmap;
  c1, c2: PByte;
  x, y, i,
  different, BytesPerPixel: Integer;
  // Se different for diferente de 0, as imagens são diferentes
begin
  b1 := Image1.Picture.Bitmap;
  b2 := Image2.Picture.Bitmap;
  Assert(b1.PixelFormat = b2.PixelFormat);
  different := 0;
  case b1.PixelFormat of
    pf1bit, pf4bit, pf8bit: BytesPerPixel := 1;
    pf15bit, pf16bit: BytesPerPixel := 2;
    pf24bit: BytesPerPixel := 3;
    pf32bit: BytesPerPixel := 4;
  end;
  for y := 0 to b1.Height - 1 do
  begin
    c1 := b1.Scanline[y];
    c2 := b2.Scanline[y];
    for x := 0 to b1.Width - 1 do
      for i := 0 to BytesPerPixel - 1 do
      begin
        Inc(different, Integer(c1^ <> c2^));
        Inc(c1);
        Inc(c2);
      end;
  end;
end;