Color Incrementing

Does anyone know of an alternative way to increment an objects specific R, G or B colour value? What I am trying to accomplish is to take a group of objects and increment the red, green or blue value by 5 without effecting the other values. This has to be an increment on all existing values of each individual object. So if 3 objects have 3 different RGB's but I want to increase the RED on all of them by 5. EXAMPLE Object 1 : R-35 G-35 B-35 Changed to R-40 G-35 B-35 Object 2 : R-55 G-100 B-150 Changed to R-60 G-100 B-150 ETC.... I know this sounds specific but I am trying to create an RGB table the easiest way possible. In this example I`m referring to RGB but it could be for CMYK as well. Thanks