How to use PIL to make all white pixels transparent?

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You need to make the following changes:

  • append a tuple (255, 255, 255, 0) and not a list [255, 255, 255, 0]
  • use img.putdata(newData)

This is the working code:

from PIL import Image

img = Image.open('img.png')
img = img.convert("RGBA")
datas = img.getdata()

newData = []
for item in datas:
    if item[0] == 255 and item[1] == 255 and item[2] == 255:
        newData.append((255, 255, 255, 0))
    else:
        newData.append(item)

img.putdata(newData)
img.save("img2.png", "PNG")

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