Radial Hue Layer Color Conversion Table for Accurate RGB to CMYK Mapping
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Solution Overview
Problem
Conventional color conversion tables, particularly those using orthogonal grids, fail to accurately reflect human perception of color, leading to poor color reproducibility and compatibility issues with existing systems, as they do not account for the sensitivity to achromatic color, chroma, and hue variations.
Innovation Solution
A cubic grid color conversion table is developed, where grid points are arranged radially around an achromatic color axis, allowing for better alignment with human color perception by dividing lines into equal parts and stacking hue layers to form orthogonal grids, enabling more accurate color conversion and adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional orthogonal grid color conversion table is used, then the structure is simple and easy to implement, but the color conversion accuracy and compatibility with human perception are poor
Solution Approach 1:
The color conversion table is divided into multiple hue layers, each containing grid points for a specific hue range. This segmentation allows the table to capture human perception characteristics for different hues while maintaining an organized structure that can be systematically processed and converted.
Solution Approach 2:
The patent introduces a hue dimension to the traditional RGB-CMYK conversion table structure. By adding hue as a separate dimension and organizing grid points according to hue angles, the table achieves more accurate color conversion that aligns with human perception while maintaining compatibility with existing systems.
2Measurement precision
If grid points are arranged irregularly to match human perception, then color accuracy improves, but compatibility with existing systems and processing ease deteriorate
Solution Approach 1:
The color conversion table is divided into multiple hue layers, each containing grid points for a specific hue range. This segmentation allows the table to capture human perception characteristics for different hues while maintaining an organized structure that can be systematically processed and converted.
Solution Approach 2:
The patent changes the arrangement parameters of grid points from uniform orthogonal coordinates to hue-based angular coordinates. By organizing grid points according to hue angles and chroma values, the table achieves more accurate color conversion that aligns with human perception while maintaining compatibility with existing systems.
3Measurement precision
If radial grid arrangement is used to improve color conversion, then color accuracy enhances, but compatibility with existing orthogonal grid systems deteriorates
Solution Approach 1:
The color conversion table is designed to serve multiple functions: it maintains compatibility with existing orthogonal grid systems while simultaneously enabling accurate color conversion according to human perception. The hue layer structure allows the table to work with both conventional and advanced color processing methods.
Solution Approach 2:
The patent introduces a hue dimension to the traditional RGB-CMYK conversion table structure. By adding hue as a separate dimension and organizing grid points according to hue angles, the table achieves more accurate color conversion that aligns with human perception while maintaining compatibility with existing systems.
Data Source
AI summary
A color conversion program including a grid point arranging part which arranges, between an input device represented by three values of RGB and four values of CMYK, grid points as correspondence of the RGB value of the input device and the CMYK value of the output device in a radial direction from a prescribed achromatic color axis to generate a radial color conversion table; and a color conversion table restructuring processing part which stacks, in the order of hue, a hue layer consisting of a surface of a hue and a surface of its complementary hue of the radial color conversion table to generate an orthogonal grid color conversion table in which the grids form an orthogonal grid.