Help with image color modification

[BigDan531]

okay guys below is my code

<?php
session_start();
header ("Content-type: image/png");


$img_handle = imageCreateFromPNG("bg2.PNG");
$color = ImageColorAllocate ($img_handle, 100, 100, 100);
ImageString ($img_handle, 5, 20, 13, $_SESSION['rkey'], $color);
ImagePng ($img_handle);
ImageDestroy ($img_handle);

?>

The current output is 134534(example)
But i would like the output to be 134534.

Any ideas on how i would go about to achieve this output.

Thanks
Danny