Image Lib - Resize failure

[eluser]gRoberts[/eluser]
Well i thought i had fixed it. It seems that this works for the specific image i had but doesn't work for gifs.

Would there be any reason why it wont work?

I have attached the image that doesn't work using GD2 and CI's image lib.

Code:

public function generate($source, $output, $width, $height) {

            
            $size = getimagesize($source);

            if($size[0] > $width || $size[1] > $height) {

                $src = imagecreatefromjpeg($source);
                
                $original_width = imagesx($src);
                $original_height = imagesy($src);

                if($original_width > $original_height) {
                    $new_width = $width;
                    $new_height = $original_height*($width/$original_width);
                } else {
                    $new_height = $width;
                    $new_width = $original_width*($width/$original_height);
                }
                $op_img = imagecreatetruecolor($new_width, $new_height);
                imagecopyresampled($op_img, $src, 0, 0, 0, 0, $new_width, $new_height, $original_width, $original_height);
                imagejpeg($op_img, $output);

            } else
                copy($source, $output);

        }