High-speed color saturation converter for digital color data

A converter for changing a saturation of color data representing three primary colors, comprising:

• means for providing r, g, and b data corresponding to the primary color data;
• means for generating changeable matrix parameters .alpha. and .beta. by which the saturation is defined;
• and
• means for converting the r, g, and b data into r*, g* and b* data using a conversion matrix such that a color saturation of the r*, g*, and b* data can be changed independently of an intensity of the r*, g* and b* data according to said matrix parameters .alpha. and .beta., said conversion matrix being defined in the following relation;
• ##EQU11## where K in the above relation is a proportional constant defining the intensity of the r*, g* and b* data.

A converter for changing a hue of color data representing three primary colors, comprising:

• means for providing r, g, and b data corresponding to the color data;
• and
• means responsive to variable parameters K and .theta., for converting the r, g, and b data into r*, g*, and b* data using a conversion matrix, such that a hue of the r*, g*, and b* data can be changed independently of an intensity of the r*, g* and b* data according to said parameter .theta., said conversion matrix being defined in the following relation:
• ##EQU12## where the parameters K and .theta. define the intensity and hue of the r*, g*, and b*, respectively.

A color processor for controlling a color saturation of a composite color signal including a luminance signal Y, a color-difference signal (R-Y), and a color-difference signal (B-Y), comprising:

• means for converting an analog composite color signal into digital signals Y, (R-Y), and (B-Y);
• means responsive to variable parameters K and a, for converting the digital signals Y, (R-Y), and (B-Y) into digital signals Y*, (R-Y)*, and (B-Y)* using a conversion matrix, such that a saturation of a color signal produced from the signals Y*, (R-Y)* and (B-Y)* can be changed independently of an intensity of the color signal according to said parameter a, said conversion matrix being defined in the following relation:
• ##EQU13## where k1, k2, and k3 are predetermined coefficients, and the parameters K and a define the intensity and saturation of the color signal, respectively;
• and
• means for converting the signal Y*, (R-Y)*, and (B-Y)* into a processed composite color signal.