how to categrise pictures according to picture colour and texture using c++???
You will need some libraries to do the job. I think you will find some free libraries, just try to google. I will try to find if I have some time.
what kind of libraris?
I am not sure, because i have never worked with images but for image manipulating you have to use librarys(writing your own would be pointless and hard ass task). Have a look at libpng and cimg. I don't know if you can do what you want with those but you can try.