Pascal Getreuer

Thanks, Matteo!

The difference between this package and my previous 2006-2008 Color Space Converter is that colorspace is now implemented in C code. There are two advantages to this. First, colorspace now runs in MATLAB as a MEX function, which is noticeably more efficient than the previous M-code version. Second, colorspace can also be used from normal C and C++ programs---MATLAB is not required to use colorspace.

In case MEX is not an option, a pure M-code version of colorspace is also included (effectively an updated version of the previous colorspace).

Additionally, the sRGB definition of gamma-corrected RGB is now used, and two spaces have been added (HSI and CIE CAT02 LMS).

Thanks for your great work!
I have used the function “colorspace( )” which can be found in the page of "http://www.mathworks.com/matlabcentral/fileexchange/28790-colorspace-transformations" as follows:

rgb = imread('peppers.png');
C = makecform('srgb2lab');
lab = applycform(rgb,C);

lab_2 = colorspace('lab<-rgb', rgb);
lab_3 = lab2uint8(lab_2);

I was surprised that the values in lab and lab_3 were quite different. I want to know the mistake in my code or my logical.

Thanks a lot.