Color Conversion Definition for Mixed Illumination
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Solution Overview
Problem
Current methods for creating color conversion definitions in image output devices, such as printers, fail to optimize output color reproduction across various illumination lights and observational environments, leading to inconsistent color appearances and an uncomfortable feeling when viewed under different lighting conditions. Additionally, these methods require extensive color measurement and calculation, are not versatile, and do not account for the frequency of use in each environment.
Innovation Solution
A method for creating a color conversion definition that involves assuming observational environments with different illumination lights, determining measured color values under mixed illumination, and creating a color conversion definition based on these values to minimize color differences across multiple environments, allowing for user-defined priorities and weighting, thereby reducing the number of color measurements and calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If separate color conversion definitions are created for each illumination light to optimize output color reproduction, then color accuracy under specific illumination is improved, but the number of color measurements and calculations increases significantly
Solution Approach 1:
The patent merges multiple illumination light conditions into a single mixed illumination light for color measurement. By combining the spectral characteristics of multiple illumination lights (e.g., daylight, fluorescent, incandescent) into one composite illumination spectrum, the system creates a single color conversion definition that accounts for all observed illumination conditions simultaneously, rather than requiring separate measurements for each light source
Solution Approach 2:
The patent creates a universal color conversion definition that functions across multiple illumination conditions. The mixed illumination light approach produces a single color conversion table that can be used universally for all observed illumination environments, eliminating the need for separate conversion definitions for each light source while maintaining color accuracy across all conditions
2Manufacturing precision
If color conversion definition is optimized for a single illumination light, then color reproduction under that specific light is accurate, but color appearance varies uncomfortably under different illumination lights
Solution Approach 1:
The patent combines multiple illumination light spectra into a single mixed illumination light that represents the aggregate of all observed lighting conditions. By measuring device colors under this composite illumination rather than individual lights, the resulting color conversion definition inherently accounts for variations across all illumination types, producing consistent color appearance regardless of which specific light source is used during observation
Solution Approach 2:
The patent changes the illumination parameter from single-source to multi-source mixed illumination. By modifying the spectral composition of the measurement illumination to include contributions from multiple light sources, the system transforms the color measurement process to capture device color characteristics that remain stable across varying illumination conditions, thereby improving adaptability without sacrificing accuracy
3Ease of manufacture
If conventional color conversion methods are used, then the process is simple, but it does not account for frequency of use in different observational environments
Solution Approach 1:
The patent introduces dynamic weighting factors that reflect the frequency of use for each observational environment. The mixed illumination light composition is adjusted based on these weights, allowing the color conversion definition to adapt to the actual usage patterns of different lighting conditions. This dynamic approach maintains procedural simplicity while incorporating environmental adaptability through configurable weight parameters
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 enables optimal output color reproduction with reduced differences in appearance under various illumination lights, allowing for user-defined weighting and frequency-based adjustments, making it applicable to conventional applications and modules, and enabling color correction for each color material.
Implementation Method 1
a response from the cones is handled as a CIEXYZ color coordinate system... tristimulus values X, Y, and Z are expressed by: X=k∫φ(λ)x(λ)dλ, Y=k∫φ(λ)y(λ)dλ, Z=k∫φ(λ)z(λ)dλ
Implementation Method 2
a spectral distribution φ (λ) of a reflected light which enters the human eyes from the object is expressed by φ(λ)=R (λ)P (λ)
Data Source
AI summary
The present invention is to provide methods and apparatuses for creating color conversion definition to make the same output result appear without any uncomfortable feeling when a same output result is observed under different illumination lights. To achieve this, the method comprising the successive steps of: (a) assuming an observational environment under an illumination light in which a difference in color appearance of an output result of the image output device in a plurality of observational environments with different illumination lights to observe the output result is made less; (b) determining measured color values of a device color of the image output device in the observational environment under the illumination light in which a difference in each color appearance is made less; and (c) creating a color conversion definition on the basis of the measured color values of the device color of the image output device determined at step (b).