I don't need, in fact. It's the little things that the artist does not need.
But if in fact, the default choice is the component H (hue hue). In this case, the color column is the choice of shade of color, square field, you select the saturation (S, saturation, horizontal) and brightness (B, brightness, vertical) color. Accordingly, switching to component S, we in the color column select saturation, and the square box shade and brightness of color. Switching to B, the color column is selected the brightness, and on hue and saturation. This is true for the components R, G, B. Only in this case, we are already working with a color representation not as HSB (hue, saturation, brightness), and RGB (red, green, blue). That is, choosing R component, the color column is governed by the intensity of the red color components (R, red), and the square of the intensity of the blue (B, blue, horizontal) and green (G, green, vertical) color component. Consequently, choosing G or B we choose a component that will be adjusted in the color column (and the remaining two will be adjusted on a square field).