Color Gamut Compression Preserving Relative Differences
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Solution Overview
Problem
Electronic visual displays can only reproduce a limited range of colors, known as the gamut, which is smaller than the range of colors perceived by the human eye, making it difficult to accurately display and compare colors that fall outside this range.
Innovation Solution
A method to display colors on an electronic visual display by determining if colors are out of the gamut, applying a compression factor to bring the most remote color within the gamut while preserving the relative color differences between colors, and adjusting co-ordinates to ensure accurate representation of colors within the gamut.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If colors outside the gamut are displayed using conventional methods, then the display can show a wider range of colors, but the color information is lost or distorted due to clipping or compression
Solution Approach 1:
The patent introduces an intermediary color space transformation system that maps out-of-gamut colors through a series of controlled transformations. The system uses a reference color and calculates transformation factors that preserve color relationships while adapting to the display's gamut limitations, thereby displaying colors outside the typical gamut without losing important color information.
Solution Approach 2:
The patent changes the parameter representation of colors by transforming them from a standard color space into a display-adapted color space. This involves calculating transformation factors based on the reference color and display characteristics, then applying these factors to adjust the color parameters (hue, saturation, lightness) to preserve relative color differences while ensuring displayability.
2Adaptability or versatility
If a compression factor is applied to bring all colors within the gamut, then all colors can be displayed, but the relative color differences between colors are not preserved
Solution Approach 1:
The patent applies local quality by treating different colors differently based on their specific characteristics and relationships. Instead of applying a uniform compression to all colors, the system calculates individual transformation factors for each color based on its distance from the reference color and its specific hue, saturation, and lightness properties, thereby preserving local color differences while ensuring all colors fit within the gamut.
Solution Approach 2:
The patent introduces dynamics by making the color transformation adaptive rather than static. The transformation factors are dynamically calculated based on the reference color and the specific colors being displayed, allowing the system to adjust the compression and transformation parameters in real-time to preserve color relationships while maintaining gamut compliance.
3Reliability
If colors are clipped to the gamut boundary, then the display remains within acceptable color ranges, but the original color information and nuances are lost
Solution Approach 1:
The patent applies preliminary action by performing color space transformation and calculation of transformation factors before the actual color display. The system pre-calculates the necessary adjustments based on the reference color and display characteristics, then applies these transformations to preserve color nuances while ensuring the final displayed colors remain within the reliable gamut boundaries.
Data Source
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AI summary
The present invention relates to a method of displaying colours on an electronic visual display. The colours correspond to a principal colour and one or more auxiliary colours each of which is defined by colour co-ordinates within a colour space. When one or more of the colours is out of the gamut of the display, adjustments are made to the co-ordinates of each colour to allow adjusted colours to be displayed that preserve the colour differences between the principal colour and each of the one or more auxiliary colours.