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

RGB Luminance value = 0.3 R + 0.59 G + 0.11 B

http://www.scantips.com/lumin.html

If you're looking for how close to white the color is you can use Euclidean Distance from (255, 255, 255)

I think RGB color space is perceptively non-uniform with respect to the L2 euclidian distance. Uniform spaces include CIE LAB and LUV.