random change of color pixel with PIL

[louloudevinci]

Hey !
I wrote this code to randomly change the colors pixels of an image.
The first time, it's good, pixels are randomly changed but after this, it'ls always the same image and pixels...
Can you tell me why ?

from PIL import Image
from random import randint

picture_1 = Image.open("panda.jpg")

largeur, longueur = picture_1.size

print(largeur,"*",longueur)

picture_2 = Image.new("RGB", (largeur, longueur))

for x in range(largeur) :
    for y in range(longueur) :
        (r, g, b) = picture_1.getpixel((x,y))
        r = randint(0,25) ; v = randint(0,255) ; b = randint(0,255)
        picture_2.putpixel((x,y), (r, g, b))


picture_2.save("pandatest6.jpg")
picture_2.show()

[mlieqo]

Hello, hopefully I understand what you want to do - create a new image with the same size as panda.jpg but color of every pixel is randomly generated, so:

        (r, g, b) = picture_1.getpixel((x,y))

What is this line for?

Here:

r = randint(0,25) ;
v = randint(0,255) ;
b = randint(0,255)

Semicolons should be removed and also you have variable called v?

[louloudevinci]

Hey ! You understood me !

(r, g, b) = picture_1.getpixel((x,y))

This line is for get the values of the r, g and b for all the pixels of the image.
I don't need this for change the value after ?

And, I'm french, so "v" is for "vert" which means "green" ^^
I changed it with a "g", but now, my image is just a lot pixels everywheeeeeere...

So, if i change only the r and g for exemple, the image stay correct, but the random thing doesn't work...

Anyway, thanks for your help, i must find an other solution...

[mlieqo]

(r, g, b) = picture_1.getpixel((x,y)

You don't need color of pixel from your original picture because you dont actually use them

So altogether, with loop changed to this:

for x in range(largeur) :
    for y in range(longueur) :
        r = randint(0,25)
        g = randint(0,255)
        b = randint(0,255)
        picture_2.putpixel((x,y), (r, g, b))

it will create a new image with the same size as your original picture and every pixel will have random color.

Or is this not actually what you wanted? :D

[louloudevinci]

Indeed ^^
I wanted to change randomly the color of my image, to get the same image with different colors, but i have no idea how to do this now...
I can just change two variables, it works, but I would like to change them all randomly...