Not Overlaying text

[audiopro]

I have this script which creates a thumbnail from a large picture.
I am trying to add text over it but with little success.

<?php
$img_name=$_GET['imnam'];
$max_width    = 150; // maximum x aperture  in pixels
$max_height   = 150; // maximum y aperture in pixels
$size=GetImageSize($img_name);
$width_ratio  = ($size[0] / $max_width);
$height_ratio = ($size[1] / $max_height);
 
if($width_ratio >=$height_ratio) 
{
   $ratio = $width_ratio;
}
else
{
   $ratio = $height_ratio;
}
 
$new_width    = ($size[0] / $ratio);
$new_height   = ($size[1] / $ratio);
Header("Content-Type: image/jpeg");
$src_img = ImageCreateFromJPEG($img_name);
$thumb = ImageCreateTrueColor($new_width,$new_height);
ImageCopyResampled($thumb, $src_img, 0,0,0,0,($new_width-1),($new_height-1),$size[0],$size[1]);
ImageJPEG($thumb);

$textcolor = imagecolorallocate($thumb, 255, 255, 255);

imagestring($thumb, 5, 0, 0, "AD", $textcolor);

ImageDestroy($src_img);
ImageDestroy($thumb);
?>

I have got the overlay script from the following, which works on it's own but not with the first part of my script.

<?php
// create a 100*30 image
$im = imagecreatetruecolor(100, 30);

// white background and blue text
$bg = imagecolorallocate($im, 255, 255, 255);
$textcolor = imagecolorallocate($im, 0, 0, 255);

// write the string at the top left
imagestring($im, 5, 0, 0, "Hello world!", $textcolor);

// output the image
header("Content-type: image/jpeg");
imagejpeg($im);
?>

Please tell me what I am missing.
What is the function of $bg?

Keith

http://www.studiosoft.co.uk

 

[audiopro]

Terminal numbness I'm afraid
I was outputting the image before putting the text on.

Keith

http://www.studiosoft.co.uk