I got the image like this (it's a graph):
(source: kitconet.com)
I want to change the colours, so the white is black, the graph line is light blue, etc.. is it possible to achieve with GD and PHP?
This will replace the white color with Gray
$imgname = "test.gif";
$im = imagecreatefromgif ($imgname);
$index = imagecolorclosest ( $im, 255,255,255 ); // get White COlor
imagecolorset($im,$index,92,92,92); // SET NEW COLOR
$imgname = "result.gif";
imagegif($im, $imgname ); // save image as gif
imagedestroy($im);