function image_imagick_inverse in Imagick 7
Converts the image to a negative form
Parameters
$image: An image object. The $image->resource value will be modified by this call.
$data: Array of data passed through by the form.
Return value
TRUE or FALSE, based on success.
File
- effects/imagick.inverse.inc, line 13 
Code
function image_imagick_inverse(stdClass $image, $data = array()) {
  return $image->resource
    ->negateImage(FALSE);
}