Replace a Color (RGB) from an Image using Python Pillow

python-pillow-image-change-background.py

from PIL import Image

img = Image.open("test_image.jpg")
img = img.convert("RGB")

datas = img.getdata()

new_image_data = []
for item in datas:
    # change all white (also shades of whites) pixels to yellow
    if item[0] in list(range(190, 256)):
        new_image_data.append((255, 204, 100))
    else:
        new_image_data.append(item)
        
# update image data
img.putdata(new_image_data)

# save new image
img.save("test_image_altered_background.jpg")

# show image in preview
img.show()

if item[0] in list(range(190, 256)):

How does one determine this range? Thanks!

if item[0] in list(range(190, 256)):

How does one determine this range? Thanks!

Hello there,
In this example, I get the first value i.e item[0] of the tuple e.g. RGB(190, 240, 200).
Hence, item[0] = 190, which in range of my condition.
Then I replace that pixel with yellow i.e RGB(255, 204, 100).

This condition can change, it depends on what colour in image i.e test_image.jpg you want to replace. I attached a short sample using the exact code. I hope that's clear!

Screen.Recording.2021-06-14.at.10.27.50.AM.mov

In this example, I get the first value i.e item[0] of the tuple e.g. RGB(190, 240, 200).
Hence, item[0] = 190, which in range of my condition.
Then I replace that pixel with yellow i.e RGB(255, 204, 100).

Can you please be more specific or show the code as how we are suppose to do that

@fschatbot Use MS paint's colour picker or use GIMP and guess the colour range. There is no definite method to determine the range.