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...compare two images pixel by pixel?
Autor: Lord Crc
[ Print tip ]  

Tip Rating (37):  
     


procedure TForm1.Button1Click(Sender: TObject);
var
  
b1, b2: TBitmap;
  c1, c2: PByte;
  x, y, i,
  different: Integer; // Counter for different pixels
begin
  
b1 := Image1.Picture.Bitmap;
  b2 := Image2.Picture.Bitmap;
  Assert(b1.PixelFormat = b2.PixelFormat); // they have to be equal
  
different := 0;
  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 // 1, to 4, dep. on pixelformat
      
begin
        
Inc(different, Integer(c1^ <> c2^));
        Inc(c1);
        Inc(c2);
      end;
  end;
end;

 

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