Each frame of an animated GIF can have a different palette #4977
Description
This StackOverflow question refers https://stackoverflow.com/q/64334674/2836621
If you look at the animated GIF in that question and analyse it with ImageMagick, you will see that each frame has a different palette:
$ identify -verbose anim.gif | grep -A5 "Colormap:"
Colormap:
0: (6,2,3,1) #060203FF srgba(6,2,3,1)
1: (253,135,19,1) #FD8713FF srgba(253,135,19,1)
2: (29,82,41,1) #1D5229FF srgba(29,82,41,1)
3: (44,74,95,1) #2C4A5FFF srgba(44,74,95,1)
4: (101,134,148,1) #658694FF srgba(101,134,148,1)
--
Colormap:
0: (5,5,6,1) #050506FF srgba(5,5,6,1)
1: (206,130,24,1) #CE8218FF srgba(206,130,24,1)
2: (112,67,11,1) #70430BFF srgba(112,67,11,1)
3: (12,70,103,1) #0C4667FF srgba(12,70,103,1)
4: (15,135,146,1) #0F8792FF srgba(15,135,146,1)
--
Colormap:
0: (5,5,8,1) #050508FF srgba(5,5,8,1)
1: (28,132,103,1) #1C8467FF srgba(28,132,103,1)
2: (15,71,38,1) #0F4726FF srgba(15,71,38,1)
3: (11,74,99,1) #0B4A63FF srgba(11,74,99,1)
4: (7,137,148,1) #078994FF srgba(7,137,148,1)
--
Colormap:
0: (5,5,8,1) #050508FF srgba(5,5,8,1)
1: (33,135,106,1) #21876AFF srgba(33,135,106,1)
2: (21,71,37,1) #154725FF srgba(21,71,37,1)
3: (11,73,100,1) #0B4964FF srgba(11,73,100,1)
4: (8,138,145,1) #088A91FF srgba(8,138,145,1)If you append all the frames side-by-side with ImageMagick, you will get:
convert anim.gif -coalesce +append result.png
If you analyse the same image with PIL:
import numpy as np
from PIL import Image
gif = Image.open('anim.gif')
# Append all frames together into one wide image
for i in range(img.n_frames):
img.seek(i)
frame = img.copy()
print(f'Frame: {i}, palette: {frame.getpalette()[:15]}')
frame = frame.convert('RGB')
if i==0:
combined = np.array(frame)
else:
combined = np.hstack((combined,frame))
Image.fromarray(combined).save('result.png')You get the same palette for all frames:
Frame: 0, palette: [6, 2, 3, 253, 135, 19, 29, 82, 41, 44, 74, 95, 101, 134, 148]
Frame: 1, palette: [6, 2, 3, 253, 135, 19, 29, 82, 41, 44, 74, 95, 101, 134, 148]
Frame: 2, palette: [6, 2, 3, 253, 135, 19, 29, 82, 41, 44, 74, 95, 101, 134, 148]
Frame: 3, palette: [6, 2, 3, 253, 135, 19, 29, 82, 41, 44, 74, 95, 101, 134, 148]
Frame: 4, palette: [6, 2, 3, 253, 135, 19, 29, 82, 41, 44, 74, 95, 101, 134, 148]
Frame: 5, palette: [6, 2, 3, 253, 135, 19, 29, 82, 41, 44, 74, 95, 101, 134, 148]
Frame: 6, palette: [6, 2, 3, 253, 135, 19, 29, 82, 41, 44, 74, 95, 101, 134, 148]
Frame: 7, palette: [6, 2, 3, 253, 135, 19, 29, 82, 41, 44, 74, 95, 101, 134, 148]
Frame: 8, palette: [6, 2, 3, 253, 135, 19, 29, 82, 41, 44, 74, 95, 101, 134, 148]
Frame: 9, palette: [6, 2, 3, 253, 135, 19, 29, 82, 41, 44, 74, 95, 101, 134, 148]
Frame: 10, palette: [6, 2, 3, 253, 135, 19, 29, 82, 41, 44, 74, 95, 101, 134, 148]
Frame: 11, palette: [6, 2, 3, 253, 135, 19, 29, 82, 41, 44, 74, 95, 101, 134, 148]
Frame: 12, palette: [6, 2, 3, 253, 135, 19, 29, 82, 41, 44, 74, 95, 101, 134, 148]
Frame: 13, palette: [6, 2, 3, 253, 135, 19, 29, 82, 41, 44, 74, 95, 101, 134, 148]
Frame: 14, palette: [6, 2, 3, 253, 135, 19, 29, 82, 41, 44, 74, 95, 101, 134, 148]
Frame: 15, palette: [6, 2, 3, 253, 135, 19, 29, 82, 41, 44, 74, 95, 101, 134, 148]
Frame: 16, palette: [6, 2, 3, 253, 135, 19, 29, 82, 41, 44, 74, 95, 101, 134, 148]
And a big mess :-)
Using Pillow v7.2.0 on macOS with Python 3.8.