Gamut Conversion for Bronzing Suppression in Inkjet Printing
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Solution Overview
Problem
Existing image processing and inkjet printing technologies face challenges in suppressing bronzing and optical interference effects, leading to unnatural color perceptions across different print modes due to variations in clear ink application and ink usage amounts.
Innovation Solution
An image processing apparatus and method that generates print data for multiple print modes, utilizing a gamut converting unit to adjust image data so that the same color is reproduced differently based on whether clear ink or colored ink is applied in the final scan, allowing for controlled bronzing suppression and optical interference management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If clear ink is applied to suppress bronzing and optical interference, then color perception becomes more natural, but the print data processing complexity increases due to multiple print modes and gamut conversion requirements
Solution Approach 1:
The printing process is divided into multiple independent print modes (first print mode with colored ink only, second print mode with clear ink only, third print mode with both). Each mode has its own dedicated gamut conversion and print data generation, allowing complex bronzing suppression to be managed through modular processing rather than a single complicated workflow.
Solution Approach 2:
The system dynamically selects and adjusts gamut conversion parameters based on the specific print mode being used. Different gamut conversion settings are applied depending on whether clear ink, colored ink, or both are used, enabling optimal color reproduction and bronzing suppression for each mode while maintaining overall system flexibility.
2Manufacturing precision
If gamut conversion is performed for each print mode, then color accuracy is improved, but processing time and computational resources increase
Solution Approach 1:
Gamut conversion is performed in advance for each print mode during the data preparation stage, before actual printing occurs. By pre-calculating and storing the appropriate gamut conversion parameters for each mode, the system avoids redundant computations during printing, thus maintaining high color accuracy while minimizing real-time processing time.
3Object-affected harmful factors
If clear ink application amount is varied to control bronzing, then optical interference state can be adjusted, but consistent color reproduction across different print modes becomes difficult
Solution Approach 1:
Each print mode has its own optimized clear ink application strategy and gamut conversion parameters tailored to its specific characteristics. The first mode uses parameters optimized for colored ink only, the second for clear ink only, and the third for combined application. This localized optimization allows each mode to achieve its best color reproduction while maintaining overall consistency through mode-specific configurations.
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 effectively reduces color changes and bronzing effects across various print modes, ensuring consistent and natural color perception by adjusting the gamut conversion and clear ink application strategies.
Implementation Method 1
The shift in optical phase based on the light path difference strengthens or weakens the intensity at a specific wavelength to produce light interference, and the tints of bronzing become different
Data Source
AI summary
Differences in color change due to bronze colors and the optical interference state related to bronzing are suppressed among multiple print modes. The blue primary color “Blue” in the standard RGB gamut is mapped to a point (color) that has moved in the clockwise direction, and that color is taken to be the primary color “Blue-s” in the Standard mode gamut. As a result, when an observer observes this color, the color shifted in the counter-clockwise direction is perceived as a color of the same hue as the primary color “Blue-f” in the Fine mode gamut, suppressing the difference in perceived color between the Fine mode and the Standard mode.