<? 
$im = imagecreatefromjpeg("LesGirlLilac.jpg");
header ("Content-type: image/jpeg"); 
$height=imagesy($im); 
$width=imagesx($im); 
$im2=imagecreatetruecolor($width,$height); 

for ($x=0;$x<$width;$x++){ 
        for ($y=0;$y<$height;$y++){ 
                $rgb = ImageColorAt($im, $x, $y); 
                $r = ($rgb >> 16) & 0xFF; 
                $g = ($rgb >> 8) & 0xFF; 
                $b = $rgb & 0xFF; 
                $r2=$r; 
                $g2=$g; 
                $b2=$b; 
$r=$r2+$g2+$b2; 
$g=$r2+$g2+$b2;
$b=$r2+$g2+$b2; 

$c[1] = imagecolorallocate($im2, $r, $g, $b);
$c[2] = imagecolorallocate($im2, $r2, $g, $b2); 
$c[3] = imagecolorallocate($im2, $r2, $g2, $b); 
$c[4] = imagecolorallocate($im2, $r/2, $g/2, $b/2); 
$c[5] = imagecolorallocate($im2, $r2/2, $g/2, $b2/2); 

$number = rand(1,5); 
$colour = $c[$number];  
imagesetpixel($im2, $x, $y, $colour);
}
}
imagejpeg($im2); 
imagedestroy($im);
imagedestroy($im2);
?>