I am trying to convert the Lab values to its corresponding RGB values.I don\'t want to convert Lab image to RGB image but some values of L a and b.The function cvCvtColor only w
look at the OpenCV source code or documentation for cvCvtColor and implement the equations yourself (they're all explicitly given on that page)
create a dummy image with the few Lab values you want to convert (say 1 by n by 3, where n is the number of values you want to convert) and use cvCvtColor around that.