Grayscale by Average

Problem

Convert an RGB image to grayscale using the simple channel average.

For each [r, g, b] pixel return round((r + g + b) / 3, 2). An empty image returns []; this differs from the weighted luminance conversion.

case 1

in: [[[[0,0,0],[255,255,255]]]]

expected: [[0,255]]

case 2

in: [[[[30,60,90]]]]

expected: [[60]]

case 3

in: [[[[1,2,4]]]]

expected: [[2.33]]

case 4

in: [[]]

expected: []

Starter codePython

def grayscale_average(image):
    # Your code here
    pass

4 test cases · run your code against them in the editor