Wide-Gamut Color Conversion Without Clipping
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Solution Overview
Problem
Conventional color conversion methods for wide-gamut color spaces often result in gamut clipping, which prevents proper representation of gradations and details when converting YCC data to RGB and subsequently to CMY data for direct printing, leading to suboptimal image quality.
Innovation Solution
A color conversion method that checks if RGB data is outside the gamut range, extends and clips it, divides it into regions, and applies a mapping operation using nonlinear functions to maintain wide-gamut characteristics, allowing for precise representation of colors without clipping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional YCC-to-RGB conversion with clipping is used, then the conversion process is simple and fast, but the wide-gamut color characteristics are lost and image quality deteriorates
Solution Approach 1:
The color conversion process is segmented into multiple stages: initial YCC-to-RGB conversion, gamut boundary detection, selective extension of out-of-gamut colors, and region-based mapping. This segmentation allows precise handling of different color regions while maintaining overall process efficiency.
Solution Approach 2:
The invention changes the parameter range by extending RGB values beyond the conventional 0-255 range to accommodate wide-gamut colors. By allowing temporary extension of color values and applying intelligent clipping only when necessary, the system preserves color characteristics while ensuring printer compatibility.
2Reliability
If RGB data is clipped to standard range, then compatibility with standard printers is maintained, but gradations and details are lost
Solution Approach 1:
The system performs preliminary detection of out-of-gamut colors before final clipping. By identifying which colors fall outside the printable gamut in advance, the system can apply selective extension and region-based mapping to preserve gradation information that would otherwise be lost in conventional clipping.
Solution Approach 2:
The invention introduces an intermediary processing stage between YCC conversion and final printer output. This intermediate stage includes gamut boundary detection and selective color extension, acting as a mediator that preserves wide-gamut characteristics while preparing data for standard printer compatibility.
3Adaptability or versatility
If wide-gamut colors are extended beyond standard range, then color characteristics are preserved, but standard clipping must be applied which may cause loss
Solution Approach 1:
The system applies different processing strategies to different color regions. In-gamut colors are handled with standard conversion, while out-of-gamut colors receive selective extension and region-based mapping. This local quality approach ensures color accuracy is maintained where needed without unnecessary processing elsewhere.
Data Source
AI summary
A color conversion method for wide-gamut color spaces, in which color conversion is performed without gamut clipping so that data corresponding to a predetermined wide-gamut color space can be directly output by a display device that supports a different wide-gamut color space from the predetermined wide-gamut color space, and which maintains characteristics of the predetermined wide-gamut color space. The color conversion method includes converting data of a predetermined wide-gamut color space into data of the RGB color space, determining whether the RGB data is outside the gamut of the RGB color space, extending the RGB data and clipping the extended RGB data if the RGB data is outside the gamut of the RGB color space, and dividing the clipped RGB data into a number of regions and performing a mapping operation in units of regions.