Improperly saving gif frame with some gif images

[mrnextdoor0000]

from PIL import Image, ImageSequence

def getframe(src, out):
    with Image.open(src) as img:
        print(f'file opened')
        i = 0
        for frame in ImageSequence.Iterator(img):
            if i == 1:
                frame.save(out)
                break
            else:
                i += 1

i used this method to get a 2nd frame of a gif image.
i got the frame but it was not good.
source gif:

result 2nd frame i got (gif format):

i tried to get 1st frame and 1st frame was very good unlike the 2nd.

i also tried another gif image has transparency.
i added convert function before save the frame

frame = frame.convert('RGB')

source gif:

result 2nd frame i got (jpg format):

i think the second case was occured since i did not set the background color. But there is no options about background of jpeg with Image.save().

There is some bug.. or something i missed.
Please let me know, thank you.

i used python 3.9.7 and pillow 8.3.2

[mrnextdoor0000]

I tried to get frames of Merry Christmas file with another tools, photoscape, photoshop and they gave fine frames. So I think it might be a problem with decoding gif format in pillow.
I read #1525, tried to paste a converted frame to a previous frame. It did not work. The converted frame was pasted with its noise.

[radarhere]

There is a known bug in Pillow when reading subsequent GIF frames with different palettes. For example, see #4977 for instance, which bizarrely enough, is dealing with your exact same image.

[mrnextdoor0000]

I found similar issues, #1692 , #1717 . It seems that no one has solved it in about 5 years..

[wiredfool]

@mrnextdoor0000 Feel free to send a PR!

[tomhaydn]

Related to #5837 ?

[radarhere]

#5857 will fix the first image. Here is the second frame with that PR.

[radarhere]

For the second image, the background color is actually coming from the image. The way that GIF stores transparency is by designating a certain color to the "transparent" one. So when you remove that transparency in order to save it as a non-transparent JPEG, it becomes visible.

If you want to select a background color, here is an example where green is the background color -

from PIL import Image

with Image.open("source.gif") as img:
    img.seek(1)
    img = img.convert("RGBA")
    background = Image.new("RGB", img.size, "#0f0")
    background.paste(img, (0, 0), img)
    background.save("out.jpg")

Let us know if that isn't satisfactory for any reason.