Python Pillow – Set Pixel Value

Pillow – Get pixel value at a position in image

We can set the pixel value in an image at specified coordinates in Pillow, by calling Image.putpixel() function on the given image and passing the pixel coordinates tuple and pixel value as arguments.

Python Pillow – Set Pixel Value

Syntax of putpixel() function

The syntax of putpixel() function from PIL.Image module is

PIL.Image.putpixel(xy, value)

where

ParameterDescription
xyThe coordinate, given as (x, y).
valueThe pixel value. If image is multi-channel, then it is a tuple, where each value in tuple represents value for the respective channel.

Examples

1. Set pixel at (50, 100) to while color, in image

In the following example, we read an image test_image.jpg into an Image object. Then, we set the pixel at (50, 100) with a pixel value of (255, 255, 255) using Image.putpixel() function.

We save the resulting image to a file resulting_image.jpg.

Python Program

from PIL import Image

# Open the image
image = Image.open("test_image.jpg")

# (x, y) position
xy = (50, 100)
# Pixel value
value = (255, 255, 255)

# Set pixel value
image.putpixel(xy, value)
image.save("resulting_image.jpg")
Copy

Original Image [test_image.jpg]

Python Pillow - Convert image from JPEG to PNG Example - Output image

Output Image [resulting_image.jpg]

Python Pillow – Set Pixel Value

You can notice a white pixel on the top left corner, at (50, 100) position. Because a pixel value of (255, 255, 255) represents white color.

Summary

In this Python Pillow Tutorial, we learned how to set the pixel at an XY position in the image with a specific pixel value using PIL.Image.putpixel() function, with the help of examples.

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