How to save an 2d grey image to png using PIL

To save a 2D grey image to png using PIL in Python, you can follow these steps:

1. Import the necessary modules:

from PIL import Image
import numpy as np

2. Load the image into a numpy array using the imread function from the imageio module:

img = np.array(imageio.imread('image.png'))

3. Convert the numpy array to a PIL Image object:

im = Image.fromarray(img)

4. Save the image as a png file using the save method of the PIL Image object:

im.save('output.png')

Here's the complete code:

from PIL import Image
import numpy as np
import imageio

# Load image into numpy array
img = np.array(imageio.imread('image.png'))

# Convert numpy array to PIL Image object
im = Image.fromarray(img)

# Save image as png
im.save('output.png')