[PHP] writing text on images

[e c h o p l u s A T w o r k]

Hi all,
I've stored on a db using blob fields, the content of some image file.
Ayones know how to write on these image on fly w/o using the filesystem? I
mean:

<?
$sql="SELECT file_img FROM ..";
....
while($val=mysql_fetch_row($select)){
    header("Content-type: image/jpeg");
    $img=$val[0];
    //here I need to write on this $img ... but How can I do?
...
?>

many thanks in advance
max




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