Resize rectangular image to square, keeping ratio and fill background with black

Question

I\'m trying to resize a batch of grayscale images that are 256 x N pixels (N varies, but is always ≤256).

My intention is to downscale the images.

The resiz

Answer 1

from PIL import Image

def reshape(image):
    '''
    Reshapes the non-square image by pasting
    it to the centre of a black canvas of size
    n*n where n is the biggest dimension of
    the non-square image. 
    '''
    old_size = image.size
    max_dimension, min_dimension = max(old_size), min(old_size)
    desired_size = (max_dimension, max_dimension)
    position = int(max_dimension/2) - int(min_dimension/2) 
    blank_image = Image.new("RGB", desired_size, color='black')
    if image.height