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from PIL import Image
im= Image.open('monkey.jpg')
img = im.copy()
width, height = img.size
red, green, blue = (0,0,0)
for i in range(width):
    for j in range(height):
        pixel = img.getpixel((i,j))
        red += pixel[0]
        green += pixel[1]
        blue += pixel[2]
        newpixel = img.putpixel((i,j),(red*2,green,blue))

#python
from PIL import Image

img  = Image.open('monkey.jpg')
width, height = img.size

for i in range(width):
    for j in range(height):
        pixel = img.getpixel((i,j))
        red   = pixel[0]
        green = pixel[1]
        blue  = pixel[2]
        newpixel = img.putpixel((i,j), (red*2,green,blue))

img.save("test.jpg", "jpeg")