Spot Color Ink Subset Selection for Printer Gamut Optimization
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Solution Overview
Problem
Printers often use more inks than necessary when printing spot colors, leading to inefficiency and increased susceptibility to color variation and system errors, as existing methods optimize for smooth image rendering rather than accuracy in spot color reproduction.
Innovation Solution
The use of subsets of available inks, where the dominant ink is determined based on the color wheel arrangement, and a black ink scheme is optimized using Gray Component Replacement (GCR) to minimize the number of inks required for accurate spot color reproduction, with the option to choose between max-K, min-K, or fractional black usage based on user settings or thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If ink profiles are optimized for smooth rendering of images, then image quality is improved, but the number of inks required increases
Solution Approach 1:
The patent segments the full ink set into multiple subsets, each capable of reproducing spot colors independently. Instead of using all available inks for every spot color, the system divides the ink resources into smaller functional groups, allowing selective application of the most appropriate subset for each specific color matching task.
Solution Approach 2:
The patent applies partial action by using only the necessary subset of inks required for accurate spot color reproduction rather than applying all available inks. The system determines the minimum adequate ink combination needed for each spot color, avoiding excessive ink usage while maintaining color accuracy through selective ink application.
2Adaptability or versatility
If more inks are used in the recipe, then color rendering flexibility is improved, but color variation and system errors increase
Solution Approach 1:
The patent implements dynamic ink subset selection based on the specific spot color being reproduced. The system adapts by choosing different ink subsets depending on the color characteristics, rather than using a fixed comprehensive ink set for all colors. This dynamic approach maintains versatility while reducing the number of inks involved in each specific printing operation.
Solution Approach 2:
The patent extracts and removes unnecessary inks from the printing recipe for each spot color. By identifying and eliminating inks that are not essential for achieving the target color match, the system reduces color variation and system errors while maintaining the ability to render diverse colors through selective extraction of required ink combinations.
3Adaptability or versatility
If all available inks are used for spot color printing, then gamut coverage is improved, but printer efficiency decreases
Solution Approach 1:
The patent segments the ink set into multiple subsets that collectively cover the full gamut while enabling efficient spot color reproduction. Each subset is optimized for specific color ranges, allowing the printer to achieve comprehensive gamut coverage through selective combination of subsets rather than simultaneous use of all inks, thereby improving printer efficiency.
Solution Approach 2:
The patent changes the parameter of ink subset composition based on the specific spot color requirements. By dynamically adjusting which inks are included in the active subset for each printing task, the system maintains full gamut capability while optimizing for efficiency in each individual operation, avoiding the inefficiency of using all inks for every color.
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AI summary
Optimization of ink recipes for spot colors in printers. Often, ICC Profiles are optimized for smooth rendering of images; thus, color recipes often contain more inks than are required for matching a color when generated from a Profile. When transitioning from one color to another, it is better to make smaller changes in inkings. This goal is not served when printing spot colors. Spot colors are often single, solid colors that do not vary in gradients from one to another. Herein is a discussion including dividing an N-ink set into subsets, generating an ink recipe for a desired recipe in each ink subset, and selecting a subset based on predetermined criteria. Where a spot color is out of Gamut, that color is mapped to the Gamut.