numpy: unique list of colors in the image

Question

I have an image img:

>>> img.shape
(200, 200, 3)

On pixel (100, 100) I have a nice color:

>>>         


        

Answer 1

If for any reason you will need to count the number of times each unique color appears, you can use this:

from collections import Counter
Counter([tuple(colors) for i in img for colors in i])