python - Change color in RGB images

Question

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:

Answer 1

You can try this numpy approach:

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