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Asked: 2026-05-11T13:59:38+00:00

I’m trying to make all white pixels transparent using the Python Image Library. (I’m

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I’m trying to make all white pixels transparent using the Python Image Library. (I’m a C hacker trying to learn python so be gentle) I’ve got the conversion working (at least the pixel values look correct) but I can’t figure out how to convert the list into a buffer to re-create the image. Here’s the code

img = Image.open('img.png') imga = img.convert('RGBA') datas = imga.getdata()  newData = list() 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)  imgb = Image.frombuffer('RGBA', imga.size, newData, 'raw', 'RGBA', 0, 1) imgb.save('img2.png', 'PNG')
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1 Answer

  1. 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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