else:
region_y1 //= pixels_per_byte * self.colorspace.bytes_per_cell
region_y2 //= pixels_per_byte * self.colorspace.bytes_per_cell
else:
region_y1 //= pixels_per_byte * self.colorspace.bytes_per_cell
region_y2 //= pixels_per_byte * self.colorspace.bytes_per_cell