Color Separation Table for Printing Apparatus Hue Control
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Solution Overview
Problem
Current image processing technologies face challenges in reproducing bright colors and controlling hue shifts, particularly when using basic color recording materials, leading to false gradation sequences and reduced chroma in color reproduction.
Innovation Solution
The use of a printing apparatus that combines basic color recording materials with particular color recording materials to achieve maximum ink application, allowing for hue adjustment and high chroma reproduction by determining the optimal amounts of each ink to compensate for hue shifts and enhance color reproduction characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If basic color recording materials (C, M, Y) are used for color reproduction, then the color reproduction region is limited, but using additional particular color recording materials increases device complexity
Solution Approach 1:
The patent combines basic color recording materials (C, M, Y) with particular color recording materials (R, G, B) in a unified color separation processing system. This merging allows the system to leverage both the established CMY color model and the extended RGB color gamut, achieving broader color reproduction capability while managing device complexity through integrated processing
2Manufacturing precision
If maximum ink application is used to achieve high chroma, then color saturation is improved, but hue shifts and false gradation sequences occur
Solution Approach 1:
The patent dynamically adjusts ink application parameters by introducing particular color recording materials in addition to basic colors. The color separation processing selectively applies R, G, or B recording materials based on the specific color region, enabling high chroma reproduction in certain areas while maintaining hue accuracy in others through parameter optimization
3Illumination intensity
If particular color recording materials are used to expand color gamut, then brighter colors are achieved, but false gradation sequences and hue shifts increase
Solution Approach 1:
The patent applies particular color recording materials selectively in specific local regions rather than uniformly across the entire image. The color separation processing determines where R, G, or B recording materials should be applied based on local color characteristics, achieving brightness enhancement in areas that benefit from extended gamut while preserving gradation accuracy in regions where basic CMY colors suffice
Data Source
AI summary
Lattice point data of each lattice point on W-C line in a color separation table reproducing primary color C is determined so that C ink monotonically increases from W point to C point. Also, particular color G for toning is used to monotonically increase from the halfway of W point to C point and lattice point data is determined so that the basic color C ink and the particular color G ink are mixed at C point. In a case where the reflection characteristics is made such that the basic color C ink thus produces the coloring closer to a blue color, the particular color G ink having high chroma and many portions overlapped in the zone of the C ink and the green color is used at a high density portion of the device primary color C. This realizes control of the hue shift and the high chroma both.