Convert Facebook-downloaded stickers to GIF animations! You need Pillow and an image2gif script to use this. (The latter can be found in my Gist.)

sticker-convert.py

#!/usr/bin/env python3

from os import path, makedirs

from PIL import Image
import image2gif

def splitImage_2x2(image):
    w, h = image.size
    assert((w % 2, h % 2) == (0, 0))
    w1, h1 = w // 2, h // 2
    crop_spec = [
        (0  , 0  , w1 , h1), (w1 , 0  , w  , h1),
        (0  , h1 , w1 , h ), (w1 , h1 , w  , h )
    ]
    return [ image.crop(tup) for tup in crop_spec ]

def splitImage_3x3(image, cells):
    w, h = image.size
    assert((w % 3, h % 3) == (0, 0))
    w1, h1 = w // 3, h // 3
    w2, h2 = w1 * 2, h1 * 2
    crop_spec = [
        (0  , 0  , w1 , h1), (w1 , 0  , w2 , h1), (w2 , 0  , w  , h1),
        (0  , h1 , w1 , h2), (w1 , h1 , w2 , h2), (w2 , h1 , w  , h2),
        (0  , h2 , w1 , h ), (w1 , h2 , w2 , h ), (w2 , h2 , w  , h )
    ]
    return [ image.crop(tup) for i, tup in enumerate(crop_spec) if i < cells ]

def convert(fin, fout, frames):
    print("Processing {}...".format(fin))

    img = Image.open(fin).convert("RGBA")
    assert(frames >= 4 and frames <= 9)
    if frames == 4:
        imageArr = splitImage_2x2(img)
    elif frames > 4:
        imageArr = splitImage_3x3(img, frames)

    # XXX: subRectangles option results in wrong position somehow but it should be turned on...
    image2gif.writeGif(path.join(fout, fin), imageArr, duration=0.139, dispose=2, subRectangles=False)

if __name__ == "__main__":
    # src_2x = "orig/"
    src_2x = "gif/"
    src_3x = "gif_3x/"
    distDir = "export/"
    makedirs(path.join(distDir, src_2x), exist_ok=True)
    makedirs(path.join(distDir, src_3x), exist_ok=True)

    # convert(path.join(src_2x, "851591_279586302215635_1194745542_n.png"), distDir, 4)
    convert(path.join(src_2x, "1.gif"), distDir, 4)

    for i in range(1, 40):
        convert(path.join(src_2x, "{}.gif".format(i)), distDir, 4)

    convert(path.join(src_3x, "40.gif"), distDir, 8)
    convert(path.join(src_3x, "41.gif"), distDir, 7)
    convert(path.join(src_3x, "42.gif"), distDir, 8)