Color Adjustment Method for Consistent Shading Across Printers
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Solution Overview
Problem
There are individual differences in the brightness and saturation of ink between different printing apparatuses, leading to variations in printed objects even when using the same data, making it challenging to achieve consistent color reproduction across different devices.
Innovation Solution
A color adjustment method that compares and adjusts the number of dots in printed patterns to match the degree of shading between two printing apparatuses, using a reference pattern with dots of different sizes and numbers, and a modified pattern to determine a single pattern with minimal difference in shading, allowing for consistent color output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the same printing data is used across different printing apparatuses, then the printing process is simple and efficient, but the brightness and saturation of ink vary between devices leading to inconsistent color reproduction
Solution Approach 1:
The patent changes the dot number parameter in printing data based on measured brightness values. By adjusting the dot number (a key printing parameter) according to actual measurements from each device, the system compensates for individual device variations in ink brightness and saturation, achieving consistent color reproduction across different printing apparatuses while maintaining printing efficiency
Solution Approach 2:
The patent implements a feedback mechanism where the actual brightness of printed patterns is measured and used to adjust subsequent printing parameters. The system measures the brightness of test patterns printed by each device, calculates the appropriate dot number adjustment, and applies this feedback to generate corrected printing data, ensuring consistent color output across different devices
2Manufacturing precision
If manual color adjustment methods are used to correct individual device differences, then color consistency can be improved, but the adjustment process becomes complex and time-consuming
Solution Approach 1:
The patent enables each printing apparatus to automatically perform its own color adjustment by measuring its printed output and calculating its specific correction parameters. The system prints test patterns, measures their brightness, and autonomously determines the dot number adjustments needed, eliminating the need for complex manual intervention or external calibration equipment
Solution Approach 2:
The patent creates a standardized reference pattern that is copied and printed by each device. By comparing the measured brightness of each device's copied pattern against the reference, the system automatically determines the appropriate adjustment parameters, simplifying the calibration process while ensuring consistency across devices
Data Source
Figure 1
Figure 2A~2C
Figure 3A~3B
AI summary
A color adjustment method includes first printing in which a first pattern formed of a plurality of first dots is printed by a first printing apparatus and second patterns which are formed of second dots of a same color as the first dots and which differ from each other in number of the second dots are printed by a second printing apparatus, and first comparing in which the first pattern is compared with the second patterns, and from the second patterns, the second pattern with as small as possible a color difference from the first pattern is selected, and first information is determined based on the second pattern.