def _create_background_image(self):
""" Create the background image, which consists of the two images side-by-side with a colored backdrop.
This must be recreated if the image size, padding, or background color changes. """
self._calculate_image_positions()
w, h = self._calculate_background_image_size()
image = Image.blank(w, h)
image.paste(self._image1, self._image1_position)
image.paste(self._image2, self._image2_position)
image, factor = self._rescale_to_max_size(image)
self._background_image = image
self._scale_factor = factor
def inverse_transform_image(self, image, output_size):
offset = - self._translation
warped = Image.blank(output_size[0], output_size[1], image.channels)
warped.paste(image, offset)
return warped
