1. A method performed on one or more processors comprising: receiving a perceptual curve digital code value D for an image; determining a normalized perceptual curve signal value V from a perceptual curve digital code value D determining a normalized color component value C based on a functional model of C = ( max ⁡ [ ( V 1 m - c 1 ) , 0 ] c 2 - c 3 ⁢ V 1 m ) 1 n ; determining an absolute value L from at least the normalized component value C, wherein parameters n, m, c 1 , c 2 , and c 3 are predetermined values; and rendering the image based on the determining of the absolute value L.