In [1]:

    

from PIL import Image
import numpy as np


    

In [2]:

    

im = np.array(Image.open('data/src/lena_square.png'))


    

In [3]:

    

im_1_22 = 255.0 * (im / 255.0)**(1 / 2.2)
im_22 = 255.0 * (im / 255.0)**2.2


    

In [4]:

    

im_gamma = np.concatenate((im_1_22, im, im_22), axis=1)


    

In [5]:

    

pil_img = Image.fromarray(np.uint8(im_gamma))
pil_img.save('data/dst/lena_numpy_gamma.jpg')