Overprint Prediction via Segmented Spectral Analysis
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Solution Overview
Problem
Current methods for predicting overpressure in packaging printing are inefficient and imprecise, requiring extensive measurement and evaluation of numerous color combinations, which is economically and practically challenging, especially when dealing with large color sets and varying carrier materials.
Innovation Solution
A method that breaks down measured values into transmission components for single and double passes through the print medium, considering realistic light paths and scattering, to predict overprint results with high accuracy using spectral analysis and empirical corrections, allowing for flexible responses to new color combinations without compromising prediction quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If hundreds and more color combinations are printed as color fields for measurement, then measurement precision is improved, but productivity deteriorates due to the large number of printing and evaluation efforts required
Solution Approach 1:
The patent segments the complex overprint prediction problem into separate single-color measurement components. Instead of measuring complete overprint combinations, it measures individual colors on unprinted and black preprinted substrates, then computationally combines these segmented measurements to predict overprint results, significantly reducing the number of physical printings required
Solution Approach 2:
The patent performs preliminary measurements of individual colors on unprinted and black preprinted substrates before actual overprint prediction. These preliminary measurements capture the interaction between each color and the substrate, which are then reused for multiple overprint predictions, eliminating the need to re-measure the same color-substrate interactions repeatedly
2Adaptability or versatility
If the color set size is increased, then adaptability is improved for handling various packaging printing jobs, but device complexity increases due to the larger number of color combinations to be managed
Solution Approach 1:
The patent introduces an intermediary computational model that acts as a mediator between simple single-color measurements and complex overprint predictions. This model mathematically combines individual color measurements to predict overprint results, allowing the system to handle large color sets without requiring corresponding increases in measurement and evaluation complexity
Solution Approach 2:
The patent creates simplified copies of the overprint measurement problem by measuring individual colors separately on standardized substrates. These simplified measurements are then computationally recombined to represent complex overprint scenarios, reducing the need to physically create and measure every possible color combination
3Measurement precision
If spectral analysis is performed on each color field, then measurement precision is improved, but loss of time increases due to the extensive measurement and evaluation process
Solution Approach 1:
The patent segments the time-consuming spectral analysis into separate measurements for individual colors on unprinted and black preprinted substrates. These segmented spectral measurements are then computationally combined rather than performing separate spectral analyses on complete overprint combinations, reducing total measurement time while maintaining precision
Solution Approach 2:
The patent performs preliminary spectral measurements of individual colors on unprinted and black preprinted substrates, which are then reused for multiple overprint predictions. This preliminary action captures the essential spectral characteristics once, eliminating the need to repeatedly measure the same color-substrate interactions for different overprint combinations
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly reduces effort while achieving highly accurate overprint predictions, accounting for carrier materials, layer thickness, and printing processes, enabling precise color representation and combination optimization.
Implementation Method 1
spectral reflectance of both the carrier and each printed level of a color are determined either by measurement or by finding the value in a database
Implementation Method 2
an individual color prediction is then first made for each of the n printing colors. This includes three transmission components and the associated transmission spectra for each of the tonal values
Implementation Method 3
the measured values are broken down into the proportion of the unprinted carrier, the proportion of the single passage of light through the colored layer and that of the double passage of light through the color layer
Implementation Method 4
the usual realistic light paths are taken into account, because in general, in addition to reflection, there is also lateral scattering of the light in the print medium
Data Source
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AI summary
The method involves determining individual color forecast for each printing color, where the forecast comprises three transmission portions and associated transmission spectrums for respective tone values. The transmission portions and the associated transmission spectrums are determined for different color combinations, and an entire reflection spectrum of over-printing is forecasted based on the determined transmission portions with the transmission spectrum and a reflection spectrum of an unprinted substrate (11).