>>> import Numeric
>>> r = [[4,5,6],[4,2,4]]
>>> g = [[0,1,2],[0,4,0]]
>>> b = [[1,0,2],[1,2,2]]
>>> f = Numeric.zeros((3,2,3))
>>> f[0,:,:], f[1,:,:], f[2,:,:] = r, g, b
>>> print f[0,:,:]
[[4 5 6]
[4 2 4]]
>>> print f[1,:,:]
[[0 1 2]
[0 4 0]]
>>> print f[2,:,:]
[[1 0 2]
[1 2 2]]
>>> g = iargb2ycbcr(f)
>>> print g[0,:,:]
[[ 17.126 17.789 18.746]
[ 17.126 18.726 17.224]]
>>> print g[1,:,:]
[[ 127.847 126.969 127.408]
[ 127.847 127.418 128.286]]
>>> print g[2,:,:]
[[ 129.685 129.827 129.756]
[ 129.685 127.264 129.614]]
