Printing Process Adaptation for Black Build-up and Color Match
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Solution Overview
Problem
Existing methods for adapting color values from a first printing process to a second printing process fail to maintain the black build-up and can exceed the maximum permitted area coverage sum, leading to inaccuracies in color reproduction and potential damage to printing presses.
Innovation Solution
A method that combines two printing process adaptations, one without maintaining black build-up and another while maintaining it, using a weighted averaging of transformed color values with a weighting function based on the proportion of chromatic inks to ensure the black build-up is preserved and the area coverage sum is not exceeded.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If color values are transformed using a single printing process adaptation method, then either visual color match or black build-up maintenance is achieved, but not both simultaneously
Solution Approach 1:
The invention divides the color transformation process into two separate adaptations: a first adaptation that prioritizes visual color match, and a second adaptation that maintains black build-up. These two segmented transformations are then combined through weighted averaging to achieve both objectives simultaneously.
Solution Approach 2:
The invention changes the weighting parameter dynamically based on the chromatic ink proportion in the source color values. When chromatic ink proportion is high, more weight is given to visual color match; when it is low, more weight is given to black build-up maintenance. This parameter change enables adaptive balancing of the two conflicting requirements.
2Quantity of substance
If black build-up is maintained strictly during color transformation, then ink application is controlled, but color visual impression may diverge between printing processes
Solution Approach 1:
The weighting function dynamically adjusts the balance between black build-up maintenance and visual color match based on the chromatic ink proportion. This parameter change ensures that ink application is controlled appropriately for different color types while preserving visual accuracy where needed.
3Manufacturing precision
If area coverage sum is not limited during color transformation, then color accuracy is improved, but printing press damage and smearing may occur
Solution Approach 1:
The weighting function responds to the chromatic ink proportion parameter to adjust the transformation outcome. For colors with low chromatic content, the transformation prioritizes black build-up maintenance, which inherently limits area coverage and prevents smearing and press damage while maintaining sufficient color accuracy.
Data Source
AI summary
A method of adapting color values, which have been produced for a first printing process to a second printing process, is performed so that the visual impressions of the colors in the two printing processes are identical. Starting from a first printing process adaptation U without maintaining the black build-up, which transforms the color values [C1,M1,Y1,K1] of the first printing process into color values [C2,M2,Y2,K2]U of the second printing process, and a second printing process adaptation V while maintaining the black build-up, which transforms the color values [C1,M1,Y1,K1] of the first printing process into color values [C2,M2,Y2,K2]V of the second printing process, a new printing process adaptation W is determined by weighted averaging of the transformed color values [C2,M2,Y2,K2]U and [C2,M2,Y2,K2]V.