A Weighted luminance is a grayscale version of an image created by a perceptual weighting of the red, green and blue channels. Instead of averaging the red, green and blue values of an image to create a black and white version, a weighted luminance image commonly consists of 59% of the green, 30% of the red and 11% of the blue values of the color image. These percentages match the color bias of the human perceptual system and provide a more representative contrast in the black and white derivative.