Color adjustment apparatus

A color adjustment apparatus comprising:

• a color space conversion means for converting a trichromatic signal to a chromaticity signal representing the two elements of the rectangular coordinate system of the plane representing two of the three attributes of color, specifically the hue and saturation components;
• a pointed color color signal setting means for setting a pointed color signal expressed by trichromatic color;
• a color adjustment area setting means for setting in a rectangular coordinate system an area used for color adjustment with said pointed color signal located at the center thereof;
• a target color color signal setting means for setting a target color signal expressed by trichromatic color;
• a second color conversion means for generating a converted color signal (R.sub.h, G.sub.h, B.sub.h) in said color adjustment area, said converted color signal obtained by shifting an original color signal (R, G, B) by an amount equal to a change from said pointed color signal to said target color signal;
• a weighting coefficient setting means for setting a weighting coefficient (.omega.) such that the weighting coefficient is highest at the center of said color adjustment area, and is reduced towards the peripheral of said color adjustment area;
• and
• a second color adjustment operating means for generating a corrected color signal (Rc, Gc, Bc) which is a sum of said converted color signal and said original color signal added at the rate of said weighting coefficient (.omega.).

A color adjustment apparatus comprising:

• a means for inputing chromaticity signal;
• a pointed color chromaticity signal generating means for generating a pointed color chromaticity signal representing the saturation and hue of the pointed color;
• a subtracting means for subtracting the pointed color chromaticity signal from an original chromaticity signal;
• a rectification smoothing means for rectifying and smoothing the output of the subtracting means;
• a limiting means for limiting the output of the rectification smoothing means to be within a predetermined maximum level;
• a phase shift means for shifting the phase of the original chromaticity signal;
• an amplification means for amplifying the output of the phase shift means by a predetermined gain level to produce an amplified chromaticity signal;
• and
• a third color adjustment operating means for performing an interior division operation on the original chromaticity signal and the amplified chromaticity signal to obtain a color adjusted chromaticity signal.