초록 ▼

A system is provided for receiving R, G and B data in digital form, such as produced by an artist using a “paint”program on a monitor screen, and converting such data to CMYB data for printing. The system independently determines tone correction values for grey balance control and color values and c

A system is provided for receiving R, G and B data in digital form, such as produced by an artist using a “paint”program on a monitor screen, and converting such data to CMYB data for printing. The system independently determines tone correction values for grey balance control and color values and combines such values to produce a highly accurate reproduction of what is viewed on a screen. Calibration procedures are provided which rapidly converge and which allow quick and accurate adjustment, such as may be required to match a particular monitor and printing inks.

대표청구항 ▼

A method for controlling production of black and cyan, magenta and yellow chromatic colors in reproduction of images, comprising the steps of supplying original image digital data in the form of groups of input data each of which defines R, G and B values variable within a certain range and respecti

A method for controlling production of black and cyan, magenta and yellow chromatic colors in reproduction of images, comprising the steps of supplying original image digital data in the form of groups of input data each of which defines R, G and B values variable within a certain range and respectively corresponding to intensity values of red, green and blue component colors of an individual pixel of an original image, and digitally processing said groups of input data to produce from each group of input data a corresponding group of output digital data for control of reproduction of an individual pixel of said original image in at least three output colors, said processing of said groups of input data including the steps of determining from said R, G and B values for each original image pixel a grey factor corresponding to whichever of said R, G and B values represents the least effective intensity, determining an output black value as a function of said grey factor, producing cyan, magneta and yellow color values which are such as to obtain a color reproduction of each original image pixel having a color other than grey, and producing cyan, magenta and yellow output chromatic values from said color values for use with said output black value in reproduction of each said original image pixel, said producing of said cyan, magenta and yellow color values including the steps of determining from said R, G and B values a saturation factor corresponding to whichever of said R, G and B values represents the greatest intensity, and thereafter determining each of said cyan, magenta and yellow output color values as a direct function of calibration values and said grey factor, said saturation factor and said R, G and B values for each original image pixel to produce a tone correction for each pixel.