Convert RGB to L*a*b* (Lab Color space) in OpenCV

Problem 1: 
Using cvCvtColor convert a sRGB image into Lab image; In other words change the color space from RGB to LAB
Problem 2: 
Do the same in MATLAB and compare results

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Lets begin with problem 2


I_srgb=imread('C:\view0.png');
I_lab = applycform(I_srgb,makecform('srgb2lab', 'AdaptedWhitePoint', whitepoint('D65')));

Lets print some values from three channels (L , a , b)

I_lab(1,1:10,1)

ans =

  184  186  195  202  203  208  213  214  206  235

Trial>> I_lab(1,1:10,2)

ans =

  128  127  125  125  125  124  123  123  125  129

Trial>> I_lab(1,1:10,3)

ans =

  148  152  154  153  153  152  149  147  147  148

Now in OpenCV here is the program

What will be archived in this blog

In this blog, we will archive the most common problems related to OpenCV. We will try to propose the solution as well.