<?php
header ("Content-type: image/png");
$text=implode($argv," ");
$image=imageCreateFromPNG("basic.png");
$background_color = ImageColorAllocate ($im, 100, 100, 255);
$text_color=imageColorAllocate($image,255,100,100);
$textX=(imageSX($image)-imageFontWidth(4)*strlen($text))/2;
imageString($image,5,$textX,10,$text,$text_color);
imagePNG($image);
imageDestroy($image);
?>
    
This is only a small modification of the example given in the manual, but the $text_color is always white.

This works for JPEG, but the quality suffers, and my build of PHP doesn't support GIF's.