A Method That Uses the Measured Ink Combination Data/Training Set to Compute the Errors That Can Be Universally Applied to Correct the Output of a Prediction Model

Abstract

The present invention relates to a method of generating “expanded color chart” representing various ink combination, for profiling a multi-color printing device or printer, using “reduced set of color chart”, printed using the printer, where a. The expanded color chart is computed by applying “Error Correction” function to the expanded color chart predicted using a theoretical model of color prediction for a given ink combinations in the expanded chart. b. Error Correction function is computed/modelled as function of the variance/difference observed between the color values predicted by the theoretical model and the actual values measured for the ink combinations in the printed “reduced set of color chart”.

We claim: 
     
         1 . A method of generating “expanded color chart” representing various ink combination, for profiling a multi-color printing device or printer, using “reduced set of color chart”, printed using the printer, where
 a. The expanded color chart is computed by applying “Error Correction” function to the expanded color chart predicted using a theoretical model of color prediction for a given ink combinations in the expanded chart. 
 b. Error Correction function is computed/modelled as function of the variance/difference observed between the color values predicted by the theoretical model and the actual values measured for the ink combinations in the printed “reduced set of color chart”. 
 
     
     
         2 . The color profile generated using the “expanded color chart” of  claim 1 . 
     
     
         3 . The method of generating color profile using the “expanded color chart” of  claim 1 , when one of more of the printing inks are fluorescent in nature, where
 a. Firstly, a color is converted into printing ink percentages using combination of inks not involving the fluorescent ink, when unsuccessful then, 
 b. The color is converted into printing ink percentages using the combination of inks involving the fluorescent ink(s). 
 
     
     
         4 . Method of separating the fluorescence factor SRF, from the reflectance data by considering the difference of reflectance values above the substrate reflectance as SRF and 0 in all other cases where it is below the substrate reflectance. 
     
     
         5 . An apparatus consisting of a computing device, a color measuring device and a printer, to be profiled with the reduced set of chart printed using the method of  claim 2 . 
     
     
         6 . An apparatus consisting of a computing device, a color measuring device and a printer, to be profiled with the reduced set of chart printed using the method of  claim 3 . 
     
     
         7 . Printer using the using the profiles of  claim 2  and articles printed thereof. 
     
     
         8 . Printer using the using the profiles of  claim 3  and articles printed thereof.