imagecreatetruecolor ?

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Hi all!
I´m trying to create a true color Jpeg thumbnail, I take a picture
(Jpg/jpeg) resized and copied -> inserted to database and a thumbnail is
saved in a diffrent folder BUT....the thumb looks wierd.

It does NOT look like its made out of true color..lol
where do I go wrong?
=)



//_-----------------------------------pic part of
function --------------------------

     $tmp_img = imagecreatetruecolor($new_width, $new_height);
      imagecopyresized($tmp_img, $img, 0, 0, 0, 0, $new_width, $new_height,
$width, $height);
      $thumb = $tmp_img;
      imagejpeg($thumb, $thumb_path);

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