Поменять левую и правую половину изображения местами PIL Python

def twist_image(input_file_name, output_file_name):
    from PIL import Image
 
    im = Image.open(input_file_name)
    x, y = im.size
 
    a = im.crop((0, 0, int(y * 0.5), x))
    b = im.crop((int(y * 0.5), 0, x, y))
 
    im.paste(b, (0, 0))
    im.paste(a, (int(x * 0.5), 0))
 
    im.save(output_file_name)

def twist_image(input_file_name, output_file_name):
    from PIL import Image
 
    im = Image.open(input_file_name)
    pixels = im.load()
    x, y = im.size
    xx = x // 2
    for i in range(xx):
        for j in range(y):
            r, g, b = pixels[i, j]
            rr, gg, bb = pixels[xx + i, j]
            pixels[i, j] = rr, gg, bb
            pixels[xx + i, j] = r, g, b
    im.save(output_file_name)

def twist_image(input_file_name, output_file_name):
    from PIL import Image, ImageChops
    im = Image.open(input_file_name)
    x, _ = im.size
    im=ImageChops.offset(im, x//2, 0)
    im.save(output_file_name)

from PIL import Image
 
 
def twist_image(input_file_name, output_file_name):
    a = Image.open(input_file_name)
    pix = a.load()
    x, y = a.size
    for i in range(x // 2):
        for j in range(y):
            pix[(x // 2 + i), j], pix[i, j] = pix[i, j], pix[(x // 2 + i), j]
    a.save(output_file_name)