Dot Arrangement Control for Wide Color Gamut Printing
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Solution Overview
Problem
Conventional color printers face challenges in achieving a wider color gamut without increasing costs or apparatus size, as techniques either require additional color materials or fail to effectively manage dot arrangements to avoid color development impairments.
Innovation Solution
A color processing apparatus generates dot arrangement signals to arrange dots of different color structures on a recording medium, forming a polyhedron in the color space that allows for wider color gamut representation without adding new color materials, by controlling the arrangement of dots to represent colors on the gamut boundary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional color materials (red, green, blue) are used to widen the color gamut, then the color gamut is widened, but the cost and apparatus size increase
Solution Approach 1:
The invention changes the parameter of dot arrangement patterns instead of changing color materials. By defining multiple dot structures with different color material arrangements and selectively using them based on position and color requirements, the system achieves wider color gamut without adding new color materials or increasing apparatus size
Solution Approach 2:
The invention segments the dot arrangement into multiple discrete dot structures (first through fourth dot structures) with specific color material configurations. Each dot structure is assigned to specific position regions and color ranges, allowing precise control over color output while using only the original four color materials
2Manufacturing precision
If dots of particular colors are arranged not to overlap those of other colors, then color development of particular colors is improved, but the color gamut becomes narrow
Solution Approach 1:
The invention applies different dot structure types to different position regions (first position region, second position region, etc.) and different color ranges. By locally optimizing dot arrangements for specific regions and colors rather than applying a uniform non-overlapping rule, the system achieves both good color development and wide color gamut
Solution Approach 2:
The invention dynamically selects among multiple dot structure types based on position and color requirements. The dot arrangement is not static but adapts to different regions and color values, allowing overlapping in some cases and non-overlapping in others, thus achieving both good color development and wide gamut
3Manufacturing precision
If dots of particular colors are arranged not to overlap those of other colors, then color development of particular colors is improved, but additional color materials are required to achieve wide gamut
Solution Approach 1:
The invention makes the four color materials (cyan, magenta, yellow, black) serve multiple functions by arranging them in different dot structures and position regions. The same color materials can represent different colors and achieve different color development effects depending on their arrangement pattern, eliminating the need for additional color materials while maintaining wide gamut and good color development
Data Source
AI summary
Image processing is performed for an image recording apparatus which records an image by arranging, on a recording medium, dots of a plurality of types of dot structures having different arrangements of color materials to be used. A dot arrangement signal which corresponds to an input color signal and represents the arrangement of dots of the plurality of types of dot structures is generated. Image data which arranges dots of the plurality of types of dot structures on a recording medium based on the dot arrangement signal is output.