Me too i need to know!!

Finally, I did it using matlab and I will mail you. Hanan !

I know about library in C#.NEt

called "AForge.Net"

so easy and simple, try to read about it

thanks Nimer,

If I is you image n by m by 3 then (in matlab):

figure

subplot(131)

imhist(I(:,:,1)); %R

subplot(132)

imhist(I(:,:,2)); %G

subplot(133)

imhist(I(:,:,3)); %B