watermark image, loosing quality

[davieboy]

<?php  

header("Content-type: image/jpeg");  

$insertfile = imagecreatefromjpeg('watermark.JPG');  

$insertfile_width = imagesx($insertfile);  

$insertfile_height = imagesy($insertfile);  

$newimage = imagecreatetruecolor($insertfile_width, $insertfile_height);  

$newimage = imagecreatefromjpeg($_GET['imgsrc']);  

$size = getimagesize($_GET['imgsrc']);  

$dest_x = $size[0] - $insertfile_width - 0;  

$dest_y = $size[1] - $insertfile_height - 0;  

imagecopymerge($newimage, $insertfile,$dest_x,$dest_y,0,0,$insertfile_width,$insertfile_height,100);  

imagejpeg($newimage);  

imagedestroy($newimage);  

imagedestroy($insertfile);  

?>

the above code seams to be loosing a bit of quality on the images when using it.
Any reason why?

David

[bradgrafelman]

Well, you're not using imagecreatetrucolor()... you create a true color image, but then overwrite the resource using imagecreatefromjpeg().