I've used this simple script to create a dynamic image.

<?
header ("Content-type: image/png");
$im = imagecreate (400, 30);
$black = ImageColorAllocate ($im, 0, 0, 0);
$yellow = ImageColorAllocate ($im, 235, 235, 51);
ImageTTFText ($im, 20, 0, 5, 25, $yellow, "impact.ttf","some text here");
ImagePNG($im);
?>

Now I want the text aliased (sharp, crisp, smooth, etc.) like you can do in photoshop? Is it possible? I looked at all the image related functions in the documentation, but don't find one (imageAlphaBlending?). Thanks!