I have never been to worried about white balance as i tend to shoot RAW but i would still love to know how to get it right if i need to.
So how exactly do you do a 'Custom White Balance'?
Some people say white card and some say grey card :-s
How big does this card need to be? Do i have to carry an A4 piece around with me? Does the shot of the card need to fill the frame?
Can someone guide me from start to finish?
thanks

