How to set an individual pixel's color

Question

I'm trying to loop through each pixel of an image, process that pixel, and set the pixel to a new color.

I've tried using Pillow:

from PIL import Image
picture = Image.open("image.png")

# Get the size of the image
width, height = picture.size

# Process every pixel
for x in range(0, width):
    for y in range(0, height):
        current_color = picture.getpixel( (x,y) )
        print(current_color)
        new_color = processPixel(current_color)
        picture.putpixel( (x,y), new_color)

But printing current_color just prints 0 for each pixel in the image

Here is the picture I'm using

Have a look here... https://stackoverflow.com/a/52307690/2836621 — Mark Setchell, Mar 30 '19 at 17:16

Inon Peled · Accepted Answer · 2019-03-30T17:06:32.923

0

Use picture.size without parentheses.

As for the printed color, the picture you posted has "P" mode in PIL, which is not "RGB" mode, hence the zeros you get.

edited Mar 30 '19 at 17:06

answered Mar 30 '19 at 16:53

Inon Peled

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That works, but `picture.getpixel((x,y))` still returns 0 (and the picture isn't all black) – Param Mar 30 '19 at 16:57
For me, your code works fine with an all-red png image. Paste your image online so that we can try it out. – Inon Peled Mar 30 '19 at 17:00
Thanks... it was just something wrong with that picture and it seems like every other image works – Param Mar 30 '19 at 17:04
Yeah, the picture you posted is apparently not in RGB mode. – Inon Peled Mar 30 '19 at 17:05

How to set an individual pixel's color

1 Answers1