GIF degrading after initial frame when import

[tomhaydn]

I'm trying to create a programatic assembler for a variety of animated gifs. I want to do this by grabbing each of the parts (each individually animated) and layering them to create the final GIF. All parts apart from the background have transparency.

from PIL import Image, ImageSequence, GifImagePlugin
import os


bg = Image.open('images/bg/Background Sky.gif')
body = Image.open('images/body/Body Blue.gif')
eyes = Image.open('images/eyes/Eyes Green.gif')
headwear = Image.open('images/headwear/Headwear Party Hat.gif')

frames = []
for idx, frame in enumerate(ImageSequence.Iterator(bg)):
    frame = Image.new('RGBA', (640, 640), color=(255,0,0,0))
    frame.paste(ImageSequence.Iterator(bg)[idx])
    frame.paste(ImageSequence.Iterator(body)[idx], mask=ImageSequence.Iterator(body)[idx].convert("RGBA"))
    frame.paste(ImageSequence.Iterator(eyes)[idx], mask=ImageSequence.Iterator(eyes)[idx].convert("RGBA"))
    frame.paste(ImageSequence.Iterator(headwear)[idx], mask=ImageSequence.Iterator(headwear)[idx].convert("RGBA"))
    
    frames.append(frame)

print(frames)

#frames[0].save('images/generated/output.gif', save_all=True, append_images=frames[0:])
frames[0].save('images/generated/output.gif', save_all=True, append_images=frames[1:], loop=0)

This is the final output:

This is the raw background:

I have tried to set the frame to a copy of the frame within the for loop:
frame = frame.copy()

But this fails also.

[tomhaydn]

Upon further investigation, it seems that non-animated parts of the gif are 'removed' on subsequent frames.

[radarhere]

You've provided "Background Sky.gif". Would you also be able to provide "Body Blue.gif", "Eyes Green.gif" and "Headwear Party Hat.gif"?
I realise they are probably not the core of the problem, but it would just be helpful to be able to easily run your sample code.

[tomhaydn]

Let's simplify it...

from PIL import Image, ImageSequence, GifImagePlugin

bg = Image.open('images/bg/Background Sky.gif')

frames = []
for idx, frame in enumerate(ImageSequence.Iterator(bg)):
    frame = Image.new('RGBA', (640, 640), color=(255,0,0,0))
    frame.paste(ImageSequence.Iterator(bg)[idx])
    
    frames.append(frame)

print(frames)

frames[0].save('images/generated/output.gif', save_all=True, append_images=frames[1:], loop=0)

The issue occurs on its own. Have tried an array of different ways, including tweaking the disposal. See below saves each frame individually but gives the same result:

from PIL import Image, ImageSequence, GifImagePlugin
import os

bg = Image.open('images/bg/Background Starry Night.gif')

print(bg.info)
print(bg.palette)
print(bg.mode)
print(bg.format)
print(bg.load())

print(bg.n_frames)
bg.convert('RGBA')
bg.save('images/generated/outputmain.gif', format='GIF', save_all=True, disposal=2)
for idx in range(bg.n_frames):
    bg.seek(idx)
    bg.save('images/generated/output'+ str(idx) +'.png', disposal=2, optimize=False, interlace=False, include_color_table=True)

[radarhere]

I've created PR #5857 to resolve this.

With it,

from PIL import Image, ImageSequence, GifImagePlugin

bg = Image.open('images/bg/Background Sky.gif')

frames = []
for idx, frame in enumerate(ImageSequence.Iterator(bg)):
    frame = Image.new('RGBA', (640, 640), color=(255,0,0,0))
    frame.paste(ImageSequence.Iterator(bg)[idx])
    
    frames.append(frame)

print(frames)

frames[0].save('images/generated/output.gif', save_all=True, append_images=frames[1:], loop=0)

now gives