#!/usr/bin/php
<?php
if($im = imagecreatefromgif($argv[1])) {
  for ($c = 0; $c < imagecolorstotal($im); $c++) {
    $col = imagecolorsforindex($im, $c);
    if($col['blue'] > $col['green'])
      imagecolorset($im, $c, $col['red'], $col['blue'], $col['red']);
  }
  echo 'image colorized\n.';
  imagegif($im, $argv[1]);
  imagedestroy($im);
} else 
  echo 'colorizing failed\n.';
?>