def cropping_mask
      return if crop_from.blank? || crop_size.blank?
      crop_from = point_from_string(read_attribute(:crop_from))
      crop_size = sizes_from_string(read_attribute(:crop_size))

      point_and_mask_to_points(crop_from, crop_size)
    end
def cropping_mask
      return if crop_from.blank? || crop_size.blank?
      crop_from = point_from_string(read_attribute(:crop_from))
      crop_size = sizes_from_string(read_attribute(:crop_size))

      point_and_mask_to_points(crop_from, crop_size)
    end
A Hash of coordinates suitable for the graphical image cropper.

 @return [Hash]