Image.save(append_images) cropping using bg color instead of alpha #7207
Description
What did you do?
I used Image.save(append_images=[]) to generate gif but it cropped part of the image (got boundary box of the image wrong). It throws away alpha when preparing to add image and then it relies only on bg color, which does not work when the image has the same color as background.
What are your OS, Python and Pillow versions?
- OS: Linux (Debian GNU/Linux 12 (bookworm) x86_64)
- Python: 3.11.2
- Pillow: 9.5.0
code:
from PIL import Image, ImageDraw
with Image.open('testin3.png') as avatar:
frames = []
deformWidth = [-1, -2]
deformHeight = [4, 3]
width, height = 80, 80
x, y = 112, 122
for i in range(2):
frame = Image.new("RGBA", (x, y), (0, 0, 0, 0))
width = width - deformWidth[i]
height = height - deformHeight[i]
avatar = avatar.resize((width, height))
avatar = avatar.convert("P", palette=Image.ADAPTIVE, colors=200).convert("RGBA")
frame.paste(avatar, (x - width, y - height), avatar)
frames.append(frame)
frames[0].save(
"testout.gif",
save_all=True,
append_images=frames[1:],
duration=400,
loop=0,
transparency=0,
disposal=2,
optimize=False
)testin3.png: 
testout.gif: 
It could be solved by this.