Final answer:
The mirror function allows you to create a mirror image of the left half of an image and overwrite the right half with this mirror image.
Step-by-step explanation:
The mirror function allows you to create a mirror image of the left half of an image and overwrite the right half with this mirror image. In the case of odd-numbered columns, the middle column remains unchanged. This function is commonly used in image processing and computer graphics to create symmetrical images or effects.