Reversing a GIF Using Python Pillow (PIL)

This tutorial explains how to reverse an animated GIF by loading it with Pillow, extracting each frame, reversing the frame order, and saving the result as a new GIF.

Import the required library:

from PIL import Image, ImageSequence

Load the GIF and split it into frames:

# Load local GIF
image = Image.open("cg.gif")
# GIF frame iterator
list = ImageSequence.Iterator(image)

Save each frame to a folder and collect them:

imgs = []
k = 1
for frame in list:
    frame.save("./chenge/img_%d.png" % k)
    imgs.append(frame.copy())
    k += 1

Reverse the frame list and save the new reversed GIF:

imgs.reverse()
imgs[0].save("reverse_cg.gif", save_all=True, append_images=imgs[1:])

The article also provides the complete source code combining all the steps above.