'Copy image to tmp and return tmp path.
We do this because the task `resize_preview` removes the src file when
finished.'

def get_image(self, filename):

    src = get_image_path(filename)
    dst = os.path.join(settings.TMP_PATH, 'preview', filename)
    copy_stored_file(src, dst, src_storage=local_storage, dst_storage=private_storage)
    return dst
