Color Error Diffusion Using Reverse Color Conversion
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Solution Overview
Problem
Existing color error diffusion methods fail to accurately translate digital color image data between different color spaces, particularly between input devices operating in spaces like sRGB and output devices operating in CMYK, leading to inaccuracies in color representation.
Innovation Solution
A reverse color conversion procedure is employed to create a final color palette for error diffusion, starting from a calibrated color profile associated with the input device, involving steps like color conversion, vector error diffusion, and the generation of a look-up table to relate input and output color spaces, ensuring accurate color representation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional color error diffusion methods are used to translate digital color image data between different color spaces, then the processing is simple and fast, but the color representation accuracy deteriorates
Solution Approach 1:
The invention creates a final color palette in advance through reverse color conversion from the input device's color space to the output device's color space. This pre-computed palette stores the optimal color mappings, allowing the error diffusion process to use accurate color translations without performing complex real-time conversions during actual image processing.
Solution Approach 2:
The invention introduces a calibrated color profile as an intermediary element that characterizes the input device's color space. This profile serves as a reference that enables accurate reverse color conversion, acting as a mediator between the input and output device color spaces to ensure precise color representation.
2Measurement precision
If reverse color conversion is used to create an accurate final color palette, then color representation accuracy is improved, but the processing complexity increases
Solution Approach 1:
The reverse color conversion and final color palette creation are performed in advance during a calibration phase, not during real-time image processing. This preliminary action separates the complex computation from the actual application, allowing accurate color translations to be ready when needed without causing time loss during operational use.
Data Source
AI summary
A color error diffusion method effective between a color image input device operating in one color space and a color image output device operating in another color space. The method includes the steps of (a) preparing a final color palette for use in a practice of vector error diffusion intermediate the color image input and output devices, and (b) basing that preparing upon a reverse color conversion step which is effectively applied to a generated calibrated color profile associated with operation of the color image input device.