Method and apparatus for controlling tint in a digital color display system

Abstract

Abstract To provide a method and an apparatus for controlling a tint in a digital color display system capable of efficiently performing tint control of displayed colors by a simple circuit. A tint control method in a digital color display system is executed in accordance with the following items (1) to (3): (1) when the maximum and the minimum among R, G, B are the maximum gray scale value (=L=2<n>-1) and the minimum gray scale value (=L=0) respectively, a step of transforming the input color into a color of a different tint having the maximum value among R, G, B equal to the maximum gray scale value (=L=2<n>-1) and the minimum value among R, G, B equal to the minimum gray scale value (=0), based on the user defined maximum transformation value (=Atm) and the transformation direction (either from (R, G, B) = (L, 0, 0) via (R, G, B)=(0, L, 0) to (R, G, B)=(0, 0, L) or (R, G, B)=(0, 0, L) via (R, G, B)=(0, L, 0) to (R, G, B)= (L, 0, 0)); (2) when the maximum and the minimum among R, G, B are Dmax and Dmin respectively (0 < Dmin < DMAX < L=2<N>-1), a step of transforming the input color into a color of a different tint having the maximum value among R, G, B equal to Dmax and the minimum value among R, G, B equal to Dmin, based on a smaller transformation value At computed from the Atm and transformation direction same as the case of the Atm; and (3) when all values R, G, B are equal, a step of not transforming the input color in accordance with any input set value.

Inventors

• 👤 Kazushi Yamauchi
• 👤 Masayuki Sohda

Bibliographic Details