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python - Change color in RGB images

I have an image (I have it in both NumPy and PIL format), and I want to change where RGB values are [0.4, 0.4, 0.4] to [0.54, 0.27, 0.07].

By doing this, I want to change the road color from gray to brown:

road

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You can try this numpy approach:

img[np.where(img == (0.4,0.4,0.4))] = (0.54,0.27,0.27)

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