Convert colour image into chromaticity image

Any tutorial or any help on how to convert colour image into chromaticity image?

Answer 1

[Walter Roberson]

http://www.mathworks.com/help/toolbox/images/ref/makecform.html

[nonyt]

i need to create my own function. I try to understand how is the one you told me working but is too much staff in it.

Any help how to create my own?

What steps do I need to follow?

[Walter Roberson]

http://www5.informatik.tu-muenchen.de/lehre/vorlesungen/graphik/info/csc/COL_21.htm

http://www.easyrgb.com/index.php?X=MATH&H=02#text2