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Question

Please define this function to do the following:


extract_layer(image, color)

Description:

It extracts a single color out of the RGB values of the color image and returns this layer as

a grayscale image. Input image should not be altered in any way.

Parameters: image (3D list of int) is the color image, color (string) is either 'red' or 'green' or

'blue'

Return value: A 2D list of int

Example:

extract_layer([ [[1,0,4], [8,0,9],[3,1,3]],

[[7,4,9], [4,5,9],[7,6,0]],

[[0,0,6], [2,8,3],[5,4,3]] ], 'red') → [[1,8,3], [7,4,7], [0,2,5]]


Restrictions

 You are not allowed to import anything.

 You are not allowed to use recursion, classes, exceptions, and list comprehensions

 From the built-in functions, you are allowed to use: range(), len(), sorted(), int(), sum()

 From list methods, you are allowed to use:

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