How to convert numpy array into image using PIL?

Question

The following code gives me black images and I can't understand why:

Imports:

import numpy as np
from PIL import Image

Code:

arr2 = np.zeros((200,200), dtype=int)
arr2[80:120,80:120]=1
im = Image.fromarray(arr2,mode="1")
im.save("C:/Users/Admin/Desktop/testImage.jpg")

Answer 1

I think you want something more like this, using Boolean True and False:

import numpy as np
from PIL import Image

# Create black 1-bit array
arr2 = np.full((200,200), False, dtype=bool)

# Set some bits white
arr2[80:120,80:120]=True

im = Image.fromarray(arr2)

im.save('a.png')

print(im)
<PIL.Image.Image image mode=1 size=200x200 at 0x103FF2770>