$pedzel = imagecreate(100,100); 
$zmiana_pedzla = imagecolorallocate($pedzel, 0, 0, 0); 
imagecolortransparent($pedzel, $zmiana_pedzla); 
For ($k = 1; $k < 18; ++$k) { 
   $kolor = imagecolorallocate($pedzel, 255, $k * 15, 0); 
   imagefilledellipse($pedzel, $k * 5, $k * 5, 5, 5, $kolor); 
} 
imagepng($pedzel); 
imagedestroy($pedzel);
