Patent ID: 8797596

Claim:
An operating device comprising: a color information storage unit configured to store color information representing a plurality of colors different from each other; a display unit configured to display a plurality of images corresponding to the plurality of colors represented by the color information stored in the color information storage unit; a plurality of selection parts configured to be respectively associated with the plurality of images displayed on the display unit, and to indicate whether a corresponding image is in a selected state or an unselected state; an intermediate color calculating unit configured to calculate color information representing an intermediate color of two colors indicated by images respectively corresponding to two selection parts in the selected state, based on color information respectively corresponding to the two selection parts; an intermediate color adding unit configured to execute an intermediate color addition to display an image corresponding to the intermediate color on the display unit, and to provide an intermediate color selection part indicating whether the image is in a selected state or an unselected state, based on color information of the intermediate color calculated by the intermediate color calculating unit; and an output unit configured to output the color information of the intermediate color corresponding to the intermediate color selection part, if the intermediate color selection part is selected, wherein the intermediate color adding unit continues the intermediate color addition if at least one of the two selection parts continues to be in the selected state, and interrupts the intermediate color addition if the two selection parts both transition to the unselected state.