如何使用 PIL 使所有白色像素透明? [英] How to use PIL to make all white pixels transparent?

问题描述

我正在尝试使用 Python 图像库使所有白色像素透明.(我是一个试图学习 python 的 C 黑客，所以要温柔)我已经进行了转换(至少像素值看起来是正确的)，但我不知道如何将列表转换为缓冲区以重新创建图像.这是代码

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")

推荐答案

您需要进行以下更改:

• 追加元组 (255, 255, 255, 0) 而不是列表 [255, 255, 255, 0]
• 使用img.putdata(newData)

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

这是工作代码:

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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