Mega Code Archive
How to invert an image
<![CDATA[
Title: How to invert an image
function InvertBitmap(MyBitmap: TBitmap): TBitmap;
var
x, y: Integer;
ByteArray: PByteArray;
begin
MyBitmap.PixelFormat := pf24Bit;
for y := 0 to MyBitmap.Height - 1 do
begin
ByteArray := MyBitmap.ScanLine[y];
for x := 0 to MyBitmap.Width * 3 - 1 do
begin
ByteArray[x] := 255 - ByteArray[x];
end;
end;
Result := MyBitmap;
end;
procedure TForm1.Button1Click(Sender: TObject);
begin
Image1.Picture.Bitmap := InvertBitmap(Image1.Picture.Bitmap);
Image1.Refresh;
end;
]]>