from PIL import Image, ImageDraw
img = Image.open(input('Введи название картинки: '))
draw=ImageDraw.Draw(img)
pix=img.load()
r=0
g=0
b=0
for i in range(img.width):
    for j in range(img.height):
        r += pix[i,j][0]
        g += pix[i,j][1]
        b += pix[i,j][2]
Sr = r//(img.width*img.height)
Sg = g//(img.width*img.height)
Sb = b//(img.width*img.height)
for i in range(img.width):
    for j in range(img.height):
        draw.point((i,j),(Sr,Sg,Sb))
img.show()