Hue Mapping for Color Gamut Consistency
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Solution Overview
Problem
Existing color gamut mapping methods suffer from degradation of color consistency due to non-uniform saturation modifications and abrupt changes in gamut boundaries, particularly when the source and target color gamuts have misaligned primary colors and different hue definitions, leading to significant hue shifts and reduced artistic intent preservation.
Innovation Solution
A method that performs hue mapping by aligning the hues of primary and secondary colors between the source and target color gamuts, allowing for adaptive hue rotation based on chroma differences, which minimizes color neighborhood degradation and maintains artistic intent by applying moderate hue shifts only when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing color gamut mapping methods are used to map source colors to target colors, then color gamut conversion is achieved, but color consistency deteriorates due to non-uniform saturation modifications and abrupt changes in gamut boundaries
Solution Approach 1:
The color gamut mapping process is segmented into multiple operations: hue rotation to align primary colors, followed by saturation scaling. This segmentation allows each operation to address specific aspects of color transformation independently, preventing the cumulative degradation of color consistency that occurs in single-step mapping methods.
Solution Approach 2:
The patent applies hue rotation as a preliminary action before saturation scaling. By first aligning the hues of primary colors between source and target gamuts, the method prepares the color space in a way that enables subsequent uniform saturation modifications without causing abrupt boundary changes or color neighborhood deformation.
2Adaptability or versatility
If saturation and lightness are compressed or expanded to fit target gamut boundaries, then gamut mapping is achieved, but hue consistency deteriorates due to abrupt changes at gamut boundaries
Solution Approach 1:
The patent performs hue rotation as a preliminary action to align the orientation of source and target gamut boundaries. This preliminary alignment ensures that subsequent saturation compression or expansion operations occur along consistent angular references, preventing abrupt hue changes at gamut boundaries and maintaining hue consistency throughout the mapping process.
3Manufacturing precision
If full hue rotation is applied to align source and target color gamuts, then hue alignment is improved, but significant hue shifts occur that reduce artistic intent preservation
Solution Approach 1:
The patent applies hue rotation selectively to align primary and secondary colors while preserving the relative hue relationships of other colors in the spectrum. This local approach to hue alignment ensures that only necessary adjustments are made, maintaining artistic intent while achieving proper gamut mapping alignment.
Solution Approach 2:
The patent applies partial hue rotation rather than full 360-degree rotation, adjusting hues only to the extent necessary to align primary and secondary colors between source and target gamuts. This partial action avoids excessive hue shifts that would distort the artistic intent of the original content.
Data Source
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AI summary
An aspect of present principles is directed to methods and systems for gamut mapping colors from a either a source color gamut or a content color gamut towards a target color gamut. A source hue of the source specific colors and a source hue of the content specific colors is changed towards a target hue of the corresponding target specific colors. Color gamut mapping is performed for the source colors of either the whole source color gamut or the content color gamut towards the target color gamut based on the mapped specific colors. The specific colors are selected from primary colors, secondary colors, a group of primary colors and secondary colors.