What is the correct way to change image channel ordering between channels first and channels last?

Question

I can not for the life of me figure out how to switch the image ordering. images are read in (x,x,3) format, theano requires it to be in (3,x,x) format. I tried changing the ord

Answer 1

x = np.zeros((12, 12, 3))
y = np.rollaxis(x, 2, 0)
y.shape

(3, 12, 12)