A novel colorimetric calibration method for four color printers using yellow, magenta, cyan and black (YMCK) is proposed. In order to determine a unique combination of YMCK, a new concept, that a four dimensional solid spanned by YMCK is projected into three dimensional color space, is introduced. Based on the concept, two categories of criteria are proposed: Three Variable method and Solid Division method. By introduction of the criteria, the number of dimension is reduced to three, and it allows us to use a conventional colorimetric calibration technique.
Also, the gamut sizes of four printers in various conditions are compared in a uniform color space by characterization of YMCK printers with four dimensional look-up-tables. In conclusion, it has been found that ;
(a) Colorimetric calibration can be performed with both methods.
(b) The Three Variable method, which includes conventional YMCK decision techniques, will loose the dark part of the entire color gamut by YMCK. And the shape of the gamut varies depending upon the choice of functions that determine new YMCK values from old YMC values.
(c) The Solid Division method can utilize the entire color gamut along with colorimetric calibration.
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