使用PIL（Python成像库）按像素比较两个图像 [英] Comparing two images pixel-wise with PIL (Python Imaging Library)

问题描述

我需要一个比较两个相同大小的PIL图像的功能。我们称它们为A和B.结果应该是一个相同大小的新图像。如果A和B中的像素相同，则应将其设置为固定颜色（例如黑色），否则应将其设置为与B相同的颜色。

I need a function which compares two PIL images of the same size. Let's call them A and B. The result is supposed to be a new image of the same size. If a pixels is the same in both A and B it's supposed to be set to a fixed color (e.g. black), otherwise it's supposed to be set to the same color as B.

是否有用于实现此功能的库而没有对所有像素进行昂贵的循环？

Is there a library for implementing this functionality without an expensive loop over all pixels?

推荐答案

不确定其他库，但你可以用PIL做这件事，比如......

Not sure about other libraries, but you can do this with PIL, with something like...

from PIL import Image, ImageChops

point_table = ([0] + ([255] * 255))

def black_or_b(a, b):
    diff = ImageChops.difference(a, b)
    diff = diff.convert('L')
    diff = diff.point(point_table)
    new = diff.convert('RGB')
    new.paste(b, mask=diff)
    return new

a = Image.open('a.png')
b = Image.open('b.png')
c = black_or_b(a, b)
c.save('c.png')

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