PHP GD inappropriate transparancy [closed]

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When i cr开发者_如何学Copped a png image using php gd library it cropped in a strange way. As it is partially cropped. I think the transparency is not working properly.

Here is my code

      imagesavealpha($this->image, true);
      $bg = imagecolorallocatealpha($this->image, 0, 0, 0, 127);
      imagefill($this->image, 0, 0, $bg);
      imagepng($this->image,$filename);

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Sounds like you like you are giving your new image the wrong size.

How do you crop the image? imagecopyresampled? http://php.net/manual/en/function.imagecopyresampled.php