level of color saturation

level of color saturation

how to have many level of color saturation in a chart. when you try to change the color of a bar at the label settings,at the display you get the type of color in RGB mode, when you click on one color, it changes to type like #FFFCOO.I want to change thetype of color in RGB where i can specify the value of R, G and B. Any tips or ideas