Abstract: An input device includes a control surface for a color correction system. The control surface includes a housing with an upwardly facing control panel. The control panel has a proximal edge which is nearest a user and a distal edge that is furthest from a user in normal use. The control panel includes a plurality of controls. The plurality of controls includes: a plurality of trackballs, wherein each trackball comprises a ball and a control ring, said ball cooperating with at least one encoder to generate a multi-dimensional control signal based on motion of the ball, and said control ring cooperating with at least one encoder to generate a one dimensional control signal based on the rotational motion of the ring, wherein the ball of said trackball is mounted concentrically with said control ring; a plurality of control buttons; and a plurality of knobs coupled to respective rotary encoders.