Creating a Colour Wheel in lab colour space

Hello Matlab community, I don't seem to be having much luck figuring this out on my own, so I thought I would appeal to you folks on here. I'm very new to MATLAB and so please forgive my rather simplistic questions here.

But what I need to do for an experiment is to generate a colour wheel that would look something like this: http://colors.napcsweb.com/colorschemer/images/cs_RYB.gif

But the wheel itself needs to be in CIELAB colour space. I don't really understand how to start doing this. We ran a previous experiment in my lab that contained a colour wheel in the HSV space . . .I've included the first part of the code below where it generates 252 colours in HSV space. Basically I need to do something like this, but generated in the CIELAB space. Any thoughts/ideas?

Thanks so much in advance.

for i = 1:252
    val = 1/252*i
    H = val; 
    S = 1;
    V = 1;
    if S == 0 %HSV from 0 to 1 
        R = V * 255; 
        G = V * 255; 
        B = V * 255; 
    else
       var_h = H * 6;
       if ( var_h == 6 )  
           var_h = 0;      %//H must be < 1
       end
       var_i = floor( var_h );             %//Or ... var_i = floor( var_h );
       var_1 = V * ( 1 - S );
       var_2 = V * ( 1 - S * ( var_h - var_i ) );
       var_3 = V * ( 1 - S * ( 1 - ( var_h - var_i ) ) );

     if ( ar_i == 0 ) 
         var_r = V     ; 
         var_g = var_3 ; 
         var_b = var_1 ;
     elseif ( var_i == 1 ) 
         var_r = var_2 ; 
         var_g = V     ;
         var_b = var_1 ;
     elseif ( var_i == 2 ) 
         var_r = var_1 ; 
         var_g = V     ; 
         var_b = var_3 ;
     elseif ( var_i == 3 )  
         var_r = var_1 ; 
         var_g = var_2 ; 
         var_b = V     ;
     elseif ( var_i == 4 )  
         var_r = var_3 ; 
         var_g = var_1 ; 
         var_b = V     ;
     else    
          var_r = V     ; 
          var_g = var_1 ; 
          var_b = var_2 ;
     end

     R = var_r * 255     ;            % //RGB results from 0 to 255
     G = var_g * 255;
     B = var_b * 255;
  end

newmap(i,1:3) = [R G B];

[irvin rynning]

Did you ever get it to work? your link to the colours is broken by the way, and you are missing an end which terminates the for loop

Answer 1

[Daniel Shub]

I believe you can convert your RGB values to CIELAB with colorspace from the FEX.

Answer 2

[Image Analyst]

You might be able to find it here: http://www.mathworks.com/matlabcentral/fileexchange/40640-computational-colour-science-using-matlab-2e in Stephen Westland's File Exchange. He's the professor who quite literally wrote the book on colour science using MATLAB.