see if the GD library is install in server Correctly
Haim Evgi
2009-07-09 05:37:51
Compare your local phpinfo() to the live phpinfo() and look for differences.
Turn on full error reporting in the image generation script:
ini_set("display_errors","2");
error_reporting(E_ALL);
Then run it directly by pointing your browser at the URL that renders the image.