Python3 PIL (Pillow) draw.pieslice bad arc - python

I'm dawing a simple pieslice with PIL
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")
As you can see the arc is not perfect. How I can make a perfect arc with PIL?


Draw on a larger image, then downscale:
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")


Note for unutbu's answer:
Now the resize() returns a resized copy of an image. So it doesn't modify the original. So this should be:
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")

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font = ImageFont.truetype("calibri.ttf", 48)
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size = draw.textsize(text, font=font)
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I solved in this way. I created two image with two different colors, and then paste them in another one image.
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cropping an image in a circular way ang paste on another image, using python

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This is the image that I want to crop in circular way
This is how the image should be looked like after cropping
This is the image on which I want to paste the circular shaped image
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from PIL import Image, ImageDraw, ImageFilter
im1 = Image.open('rocket.jpg')
im2 = Image.open('lena.jpg')
#height, width, channels = im1.shape
width, height = im1.size
print(height, width)
# ![rocket_pillow_paste_out](data/dst/rocket_pillow_paste_out.jpg)
mask_im = Image.new("L", im2.size, 0)
draw = ImageDraw.Draw(mask_im)
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back_im = im1.copy()
back_im.paste(im2, (0, 0), mask_im)
back_im.save('rocket_pillow_paste_mask_circle.jpg', quality=95)
# ![rocket_pillow_paste_mask_circle](data/dst/rocket_pillow_paste_mask_circle.jpg)
mask_im_blur = mask_im.filter(ImageFilter.GaussianBlur(10))
mask_im_blur.save('mask_circle_blur.jpg', quality=95)
back_im = im1.copy()
back_im.paste(im2, (0, 0), mask_im_blur)
back_im.save('rocket_pillow_paste_mask_circle_blur.jpg', quality=95)
# ![rocket_pillow_paste_mask_circle_blur](data/dst/rocket_pillow_paste_mask_circle_blur.jpg)

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when i trying to run this code, my image breaks
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mask_draw = ImageDraw.Draw(mask)
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I fix this with Image.alpha_composite()

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