numpy with python: convert 3d array to 2d

Question

Say that I have a color image, and naturally this will be represented by a 3-dimensional array in python, say of shape (n x m x 3) and call it img.

I want a new 2-d

Answer 1

Let's say we have an array img of size m x n x 3 to transform into an array new_img of size 3 x (m*n)

new_img = img.reshape((img.shape[0]*img.shape[1]), img.shape[2])
new_img = new_img.transpose()