A script to convert an animated webp image to gif

convert_webp_to_gif.py

from PIL import Image

def convert_webp_to_gif(webp_file, gif_file):
    # Open the WEBP file using the PIL library
    webp_image = Image.open(webp_file)
    
    # Initialize lists to store the frames and durations of the WEBP image
    frames = []
    durations = []
    
    try:
        # Loop through each frame of the WEBP image
        while True:
            # Create a new RGBA image with the same size as the current frame and a transparent background
            canvas = Image.new("RGBA", webp_image.size, (0, 0, 0, 0))
            
            # Paste the current frame onto the canvas using the frame itself as the mask
            canvas.paste(webp_image.copy(), mask=webp_image)
            
            # Add the processed frame to the frames list
            frames.append(canvas)
            
            # Retrieve the duration of the current frame and add it to the durations list
            durations.append(webp_image.info['duration'])
            
            # Seek the next frame in the WEBP image
            webp_image.seek(len(frames))
    except EOFError:
        # Break the loop when there are no more frames
        pass
    
    # Convert the frames to RGBA and quantize them
    gif_frames = [frame.convert("RGBA").quantize(method=2) for frame in frames]
    
    # Check if the image has multiple frames (is an animated GIF)
    if len(gif_frames) > 1:
        # Save the frames as an animated GIF with the specified durations, loop count, transparency, and disposal method
        gif_frames[0].save(gif_file, format='GIF', save_all=True, append_images=gif_frames[1:], loop=0, duration=durations, transparency=0, disposal=2)
    else:
        # Save the single frame as a GIF with transparency
        gif_frames[0].save(gif_file, format='GIF', transparency=0)