I use python. Today I try to convert an image(rgb) to luv.
The [Doc](http://docs.opencv.org/2.4/modules/imgproc/doc/miscellaneous_transformations.html#cvtcolor)
However , I am confused with the result.So I have a trial.
import cv2
import numpy as np
im=np.array([[[0.78039217, 0.73333335, 0.73333335]]],dtype=float32)
im_xyz=cv2.cvtColor(im,cv2.COLOR_RGB2XYZ) #the result is array([[[ 0.71641064, 0.74334133, 0.79932952]]], dtype=float32)
im_luv=cv2.cvtColor(im,cv2.COLOR_RGB2LUV)#array([[[ 76.84296417, 6.9851861 , 1.50677502]]], dtype=float32)
However,I use the matlab to rgb2luv,the result is 89.0798 ， 3.5388 ， 0.7616.
So I try the xyz to luv, the value of L is also is 89.08016438386028.
Why the result of the function cvtColor(im,cv2.COLOR_RGB2LUV) is not 89?
3Qs a lot.
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