python - Python3 PIL（枕头）draw.pieslice坏弧

Question

我正在用 PIL 做一个简单的 pieslice

image = Image.new("RGBA", (256, 128), "#DDD")
draw = ImageDraw.Draw(image, image.mode)
draw.pieslice((0, 0 , 64, 64), 180, 270, fill="white)

del draw

image.save("file.png", "PNG")

如您所见，弧线并不完美。如何用 PIL 制作完美的弧线？

Answer 1

在更大的图像上绘制，然后缩小：

N=4
image = Image.new("RGBA", (256*N, 128*N), "#DDD")
draw = ImageDraw.Draw(image, image.mode)
draw.pieslice((0, 0 , 64*N, 64*N), 180, 270, fill="white")
del draw
image = image.resize((256,128)) # using user3479125's correction
image.save("file2.png", "PNG")

Answer 2

unutbu 回答的注意事项：现在 resize() 返回一个调整大小的图像副本。所以不会修改原版。所以这应该是：

N=4
image = Image.new("RGBA", (256*N, 128*N), "#DDD")
draw = ImageDraw.Draw(image, image.mode)
draw.pieslice((0, 0 , 64*N, 64*N), 180, 270, fill="white")
del draw
image = image.resize((256,128))
image.save("file2.png", "PNG")