Convert webp animations to gif preserving image quality (RGB = 24bit)

README.md

Posted as a comment in this stackexchange question

https://unix.stackexchange.com/questions/419761/webp-animation-to-gif-animation-cli

Usage:

1. Make sure python3 is installed.
2. Install Pillow package

python3 -m pip install --upgrade Pillow

3. Download this script and run it as

python_pillow_webp2gif.py {{animated_image}}.webp

4. Use gif output produced by name

{{animated_image}}.gif

python_pillow_webp2gif.py

#!/usr/bin/env python3
from sys import argv
from pathlib import Path
from PIL import Image, ImageSequence


def webp2gif(path: Path):
    img = Image.open(path)

    frames: list[Image.Image] = []
    for frame in ImageSequence.Iterator(img):        
        im2 = Image.new("RGB", frame.size, (255, 255, 255))        
        bands = frame.split()
        mask = bands[3] if len(bands)>3 else None
        im2.paste(frame, mask=mask)
        frames.append(im2.convert('RGB'))

    frames[0].save(path.with_suffix('.gif'),
                   format='gif',
                   save_all=True,
                   append_images=frames[1:],
                   optimize=True,
                   duration=img.info.get("duration", 10),
                   loop=img.info.get("loop", 0),
                   quality=100)


webp2gif(Path(argv[1]))

Thank you!

I suggest replacing line 13 (im2.paste(frame, mask=frame.split()[3])) with these 3 lines:

bands = frame.split()
mask = bands[3] if len(bands)>3 else None
im2.paste(frame, mask=mask)

If the .webp contains only R, G, B and no A (opacity) bands, there are only 3 bands, so 'frame.split()[3]' causes an exception.

Thanks for the example.

@reviveMC74 thanksss i was stuck here

I suggest replacing line 13 (im2.paste(frame, mask=frame.split()[3])) with these 3 lines:

bands = frame.split()
mask = bands[3] if len(bands)>3 else None
im2.paste(frame, mask=mask)

If the .webp contains only R, G, B and no A (opacity) bands, there are only 3 bands, so 'frame.split()[3]' causes an exception.

Thanks for the example.

Thanks, applied.