Use aggdraw when you want to draw beautifully with pillow

I had a chance to draw a figure using pillow, but when I drew it with the default, it became a fluttering image. If you want to make it clean, you can export it in double size and specify antialiasing when resizing, but it's a bit annoying. I found a module that can be drawn beautifully from the beginning, so I will write it down.

Reference https://stackoverrun.com/ja/q/3880127 Reference https://aggdraw.readthedocs.io/en/latest/

Draw normally with pillow

It looks like this when drawing normally using pollow. Can you see that the horns are not processed and the jagi is out?

from PIL import Image, ImageDraw

image = Image.new('RGB', (300, 300), (255, 255, 255))
draw = ImageDraw.Draw(image)
draw.line((150, 50, 250, 250, 50, 250, 150, 50), fill=(0, 0, 0), width=20)
draw.line((10, 140, 290, 160), fill=(0, 0, 0), width=20)

image.save('test1.png', quality=100)

Draw normally with a pillow and round the corners

For the time being, rounding of corners is implemented in the new version of pillow. Just add * joint = "curve" * to the argument.

from PIL import Image, ImageDraw

image = Image.new('RGB', (300, 300), (255, 255, 255))
draw = ImageDraw.Draw(image)
draw.line((150, 50, 250, 250, 50, 250, 150, 50), fill=(0, 0, 0), width=20, joint="curve")
draw.line((10, 140, 290, 160), fill=(0, 0, 0), width=20)

image.save('test2.png', quality=100)

This will round the corners. The beginning and end of writing are not processed, so if you're curious, trace the first side again.

from PIL import Image, ImageDraw

image = Image.new('RGB', (300, 300), (255, 255, 255))
draw = ImageDraw.Draw(image)
draw.line((150, 50, 250, 250, 50, 250, 150, 50, 250, 250), fill=(0, 0, 0), width=20, joint="curve")
draw.line((10, 140, 290, 160), fill=(0, 0, 0), width=20)

image.save('test3.png', quality=100)

Draw with aggdraw

Installation was normal with pip

pip install aggdraw

With aggdraw, you can draw as it is on the Image created by pillow. It's like defining a pen and writing with it. Can you see that the jagi is gone because it does antialiasing and alpha synthesis on its own?

from PIL import Image
import aggdraw

image = Image.new('RGB', (300, 300), (255, 255, 255))
draw = aggdraw.Draw(image)
pen = aggdraw.Pen((0, 0, 0), 20)
draw.line((150, 50, 250, 250, 50, 250, 150, 50, 250, 250), pen)
draw.line((10, 140, 290, 160), pen)
draw.flush()

image.save('test4.png', quality=100)

bonus

There is also a brush (fill)

from PIL import Image
import aggdraw

image = Image.new('RGBA', (300, 300), (255, 255, 255, 255))
draw = aggdraw.Draw(image)
brush = aggdraw.Brush((0, 0, 0), 255)
draw.line((150, 50, 250, 250, 50, 250, 150, 50, 250, 250), brush)
draw.flush()

image.save('test5.png', quality=100)