Is there a command in PIL that is like the reverse operation to getdata()

February 17, 2022

So I have the following code that gets the rgb value of an image in a list like shown:

from PIL import Image
imageInput = Image.open("gradient.png")
r = list(imageInput.getdata())
print(r)

it returns r as an array, now, I have another code that alters that array to change the rgb value, is there a function in PIL that can feed the array to python so it can change the color of the image?

(I have digged through the PIL document and couldn’t find anything)

>Solution :

You are probably looking for putdata() method:

from PIL import Image

imageInput = Image.open("gradient.png")

# convert every tuple to a list:
r = [list(x) for x in imageInput.getdata()]

# Make your changes
for i in range(len(r)):
    r[i][1] = 100
    
# After you are done editing, convert back to tuple:
r = tuple(tuple(x) for x in r)

imageInput.putdata(r)
imageInput.save("new_gradient.png")