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Using GD to replace colors
First, here's a helpful function from another tutorial.
<?
function Hex2RGB($color){
    $color = str_replace('#', '', $color);
    if (strlen($color) != 6){ return array(0,0,0); }
    $rgb = array();
    for ($x=0;$x<3;$x++){
        $rgb[$x] = hexdec(substr($color,(2*$x),2));
    }
    return $rgb;
}
?>


<?
$im = imagecreatefromgif ("./path/to/some/gif/file.gif");

// convert all black (0,0,0) to provided hex ($_GET['c'])
$index = imagecolorclosest ( $im,  0,0,0);
$co = Hex2RGB($_GET['c']);
imagecolorset($im,$index,$co[0],$co[1],$co[2]);
//output
header("Content-type: image/gif");
imagegif($im);
imagedestroy($im);
?>


Read Previous:
Using GD to resize a jpg		Read Next:
GD & the mathematics of stringed instruments
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Skills:
  • Global (via Email/Skype/AIM(ichat)/Yahoo)
    • Web Development Consulting
    • Custom Web App Development (PHP/MySQL/jQuery/CSS) Cross-Browser & OS
    • Cellphone App Development (Android/MobileWeb)
    • Music Lessons & Education for Beginner Guitar, Piano, Bass, which transfers over to many other instruments I am comfortable playing but not yet at teaching.
    • Music - Soundtrack Composition & Voice Work
  • Local, Most all the above, but also:
    • Music Performance (Harp, Voice, Guitar, Piano, Bass, Latin Percussion)
    • Being your venue's soundman
    • Video Streaming live music and other live events anywhere that can provide wifi
    • Training Video Streaming to your venue's trusted soundperson