使用其他颜色更改所有像素的颜色 [英] Change the color of all pixels with another color

问题描述

我想使用Python更改单一颜色。

I would like to change a single color with Python.

如果存在具有PIL的快速解决方案，我会优先选择此解决方案。

If a fast solution with PIL exists, I would prefer this solution.

convert -background black -opaque '#939393' MyImage.png MyImage.png

推荐答案

如果 numpy 尝试做如下操作：

import numpy as np
import Image

im = Image.open('fig1.png')
data = np.array(im)

r1, g1, b1 = 0, 0, 0 # Original value
r2, g2, b2 = 255, 255, 255 # Value that we want to replace it with

red, green, blue = data[:,:,0], data[:,:,1], data[:,:,2]
mask = (red == r1) & (green == g1) & (blue == b1)
data[:,:,:3][mask] = [r2, g2, b2]

im = Image.fromarray(data)
im.save('fig1_modified.png')

但它应该是相当大（〜5x，但更大的图像）更快。

It will use a bit (3x) more memory, but it should be considerably (~5x, but more for bigger images) faster.

还要注意，如果你只有RGB（而不是RGBA）图像，上面的代码稍微比它需要的复杂。然而，这个例子将单独留下alpha带，而更简单的版本不会。

Also note that the code above is slightly more complicated than it needs to be if you only have RGB (and not RGBA) images. However, this example will leave the alpha band alone, whereas a simpler version wouldn't have.

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