Think of it as RGB values like in graphics. If you have full blue, you get bright blue 48 = 100%.
48,48,48, should be white but it does not work that way with the RGB LEDs. It is usually a white pink. So the opposite, 0,0,0 is black. Black is the absence of color. (r,g,b) so if you have 0,0,10 you will have a dark blue, but only as dark as "light" can permit. Mixing color with light is called additive. This is different than stuff like paint where when RGB is mixed it will make black (or yucky brown).
Check this outIf you are using the Ice buttons they are white. So if there is even just a little light in the room it will be perceived as blue white. At dim levels you ave a white ring with a blue center. This is just how it is and no real way to get around it. Personally though, I love how the ice buttons look. They allow for such pure colors.
AFE has a randomize LEDs when it is in screen saver mode. Man, my CP looks like a bowl of skittles.