Absolute Color Picker - RGB 3D

Color selection on this tab can be made with the help of two controls:
- The first one lets us choose the color using the pseudo 3D RGB model of color. Each axis has a scroll. Moving the scroll from the center to borders will change the saturation of every color constituent. Moreover saturation of color constituent will increase while moving outwards.
- The second one allows changing brightness (from lowest at the bottom to highest at the top).