gimpgradients @Returns: @num_gradients: @Returns: @Returns: @name: @Returns: @num_samples: @Returns: @num_samples: @positions: @Returns: @name: @sample_size: @width: @grad_data: @Returns: @gradient_callback: @popup_title: @initial_gradient: @sample_size: @Returns: @gradients_callback: @gradient_callback: @Returns: @gradients_callback: @gradient_callback: @gradient_name: @Returns: @gradients_callback: