def _crop(self, image, width, height, x_offset, y_offset):
        return image.crop((x_offset, y_offset,
                           width + x_offset, height + y_offset))
Crops the ``image``, starting at ``width`` and ``height``, adding the
dataset/ETHPy150Open gtaylor/django-athumb/athumb/pial/engines/pil_engine.py/PILEngine._crop