Reproduction Color Profile Correction Using Differential Colorimetric Values
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Solution Overview
Problem
The existing color prediction systems for spot color inks struggle to achieve accurate reproduction color profiles when combined with process inks, as they rely on predicted colorimetric values rather than measured values, leading to unnatural colors due to the lack of conformity between predicted and measured values.
Innovation Solution
A reproduction color profile correction device and method that calculates differential colorimetric values between predicted and measured values for process ink combinations, and adjusts these values using an adjustment factor to correct the colorimetric values for spot color ink combinations, ensuring conformity with measured values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a reproduction color profile is created using predicted colorimetric values from a color prediction model for spot color ink combinations, then the profile can be generated without actual printing and measurement, but the predicted values may not conform to measured values leading to unnatural colors
Solution Approach 1:
The patent introduces an adjustment factor as an intermediary element that mediates between the predicted colorimetric values and the actual measured values. This adjustment factor is calculated based on the difference between predicted and measured values for process ink combinations, and then applied to correct the predicted values for spot color ink combinations, thereby achieving conformity without requiring actual printing and measurement of all color combinations
Solution Approach 2:
The patent creates a virtual color chart through color prediction models that copies the essential colorimetric relationships without requiring physical printing. By using adjustment factors derived from measured process ink combinations, the system creates a corrected virtual representation of spot color ink combinations, achieving accurate color profiles without physical prototypes
2Manufacturing precision
If measured colorimetric values are obtained from actual color charts for all ink combinations, then color reproduction accuracy is maximized, but the process becomes impractical for spot color ink combinations
Solution Approach 1:
The patent makes the adjustment factor calculation process universal by using it for both process ink combinations and spot color ink combinations. The same correction methodology derived from measured process ink data is applied to correct predicted spot color ink values, eliminating the need for separate measurement processes for different ink types
Solution Approach 2:
The patent extracts the essential correction information (adjustment factors) from the measured process ink color chart data and separates it from the specific ink combination context. These extracted adjustment factors can then be applied to spot color ink combinations without requiring actual measurement of those specific combinations
Data Source
AI summary
A reproduction color profile correction system includes, a differential colorimetric value calculator which calculates a differential colorimetric value that is a difference between a predicted colorimetric value and a measured colorimetric value, the predicted colorimetric value being a colorimetric value of a predicted reproduction color corresponding to a process ink combination of an ink combination, and a measured colorimetric value being a colorimetric value obtained by measuring a reproduction color in a color chart corresponding to the process ink combination, and a colorimetric value corrector which corrects, by using the differential colorimetric value, a predicted colorimetric value of a reproduction color reproduced by the ink combination.