Help me .... colors arn't converted perfactly

Hi... !
I m working on color conversions in different color spaces like RGB to
CMYK, RGB to HSB, CIEXYZ to RGB, CMYK, HSB, CIELAB and viseversa,using Microsoft visual C++ 6.0 I am
using the algorithm which is discussed in one of the RIT white papers, or on http://easyrgb.com but I got stuck due to a reason that all of my conversions match to all of the
applications acept Abobe photoshop , I think they uses embebed gama
correction in their conversion scheme. Please guide me if i m wrong?
secondly one of my friend told me that gamma correction is also present in
CMYK I totally disagee with him. please tell me is he right? if yes then
please also guide me how to introduce gamma correction in CMYK in my
conversion module!
Thanks
U.Khan :confused: :confused: