Formula to determine brightness of RGB color

Question

I\'m looking for some kind of formula or algorithm to determine the brightness of a color given the RGB values. I know it can\'t be as simple as adding the RGB values toget

Answer 1

I found this code (written in C#) that does an excellent job of calculating the "brightness" of a color. In this scenario, the code is trying to determine whether to put white or black text over the color.