PHP/Graphics Image/imagecolortransparent

Adding Transparency

   <source lang="html4strict">

<?

   $image = imagecreatetruecolor(400,400);
   $black = imagecolorallocate($image, 0, 0, 0);
   imagecolortransparent($image, $black);

?>

 </source>
   
  

Using Brushes

   <source lang="html4strict">

<?

   $brush = imagecreate(100,100);
   $brushtrans = imagecolorallocate($brush, 0, 0, 0);
   imagecolortransparent($brush, $brushtrans);
   for ($k = 1; $k < 18; ++$k) {
           $color = imagecolorallocate($brush, 255, $k * 15, 0);
           imagefilledellipse($brush, $k * 5, $k * 5, 5, 5, $color);
   }
   imagepng($brush);
   imagedestroy($brush);

?>

 </source>