Scalable Gloss Effect via Colorant Stack Height Variation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing digital image printing/copying systems fail to effectively prevent unauthorized reproduction of high-value documents due to limitations in conventional halftone gloss marks, which require minimum size, non-scalable designs, and are not detectable in scanned reproductions.
Innovation Solution
A method involving printing with first and second colorant combinations that create a solid color region with different colorant stack heights, allowing the gloss mark to be visible only when viewed at an angle, while appearing uniform at straight-on viewing, enabling scalable and high-resolution gloss effects using standard colorants and media.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional halftone gloss marks are used, then security watermarking is achieved, but the gloss mark requires minimum size and cannot be scaled
Solution Approach 1:
The patent changes the fundamental parameter from halftone dot patterns to colorant stack height variations. By controlling the vertical stacking of colorant layers rather than spatial dot patterns, the gloss mark can be rendered at any size without minimum constraints, enabling true scalability while maintaining security functionality
Solution Approach 2:
The invention transitions from two-dimensional halftone dot arrangements to a three-dimensional colorant stack structure. By utilizing the vertical dimension (stack height) to encode gloss information, the system eliminates the minimum size constraint that plagues 2D halftone approaches, allowing gloss marks to be scaled to any dimension
2Manufacturing precision
If halftone dot structures are used, then gloss effect is achieved, but the structure cannot be printed at high resolution
Solution Approach 1:
The patent replaces complex spatial halftone patterns with simple colorant stack height variations. This parameter change from 2D spatial modulation to 1D vertical stacking dramatically simplifies the printing process while enabling high-resolution output, as it eliminates the need for precise dot placement and pattern reproduction
Solution Approach 2:
The invention extracts the essential gloss-marking function from the complex halftone structure, isolating only the critical element: colorant stack height variation. By removing the unnecessary halftone dot pattern complexity, the system achieves high-resolution printing capability while maintaining the security watermarking function
3Manufacturing precision
If colorant stack height variation is used, then scalable high-resolution gloss effect is achieved, but different colorant combinations are required
Solution Approach 1:
The patent makes the colorant stack height mechanism universal by demonstrating that any colorant combination can be used to create gloss marks. The same vertical stacking principle applies regardless of whether using CMYK, spot colors, or specialized security inks, making the technology broadly applicable across different printing systems and color requirements
4Reliability
If halftone gloss marks are used, then security watermarking is achieved, but the watermark is detectable in scanned reproductions
Solution Approach 1:
The patent replaces the optical halftone pattern system with a colorimetric system based on colorant stack heights. Since standard scanners detect reflected light intensity rather than colorant layer thickness, the gloss mark information embedded in vertical stacking is invisible to scanning systems, effectively preventing digital reproduction while maintaining human-observable security features
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution allows for the creation of scalable and high-resolution gloss effects that are undetectable in straight-on views or scanned reproductions, effectively preventing unauthorized reproduction by maintaining a uniform appearance under normal conditions.
Implementation Method 1
When the document D is viewed at an oblique angle, however, there will be a significant difference in the light reflected from the respective first and second halftone structures of the gloss mark object GO and background GB
Data Source
AI summary
A method for defining a gloss effect in a printed document includes printing a document region with first and second colorant combinations. The first colorant combination defines a first colorant stack height and said second colorant combination defines a second colorant stack height that differs from the first colorant stack height. As such, the document region has a first appearance when viewed straight-on and a second appearance when viewed at an angle. In one example, the first colorant combination is black (K) colorant that results in a one-level stack height and the second colorant combination is cyan, magenta, and yellow (CMY) colorants that result in a three-level stack height. In another example, the second colorant combination can be cyan, magenta, yellow and black (CMYK) colorants that define a four-level stack height. In such case, both colorant combinations appear as black in straight-on viewing or scanning, while the average color and/or luminance of the colorant combinations will differ from each other when the document region is viewed at an oblique angle. The desired gloss font or other gloss effect is defined by selective placement of the first and second colorant combinations relative to each other. Font sizes of 3 points or less can be defined.