Ink Density Lookup Table for Special Ink Color Separation
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Solution Overview
Problem
Printing technologies using special inks like fluorescent ink face issues with color reproduction when image data is compressed using lossy compression systems, leading to deviations in RGB values that can result in improper color representation and loss of special ink effects in print products.
Innovation Solution
An information processing apparatus and method that converts image data into density data using a look-up table, where grid points in RGB color coordinates are associated with density values corresponding to multiple inks, ensuring a first grid point with a non-zero density value for a specific ink and a second grid point with zero density value, preventing adjacent grid points, allowing for accurate ink color separation and maintaining special ink effects even with lossy compression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If lossy compression is applied to image data to reduce data weight, then data transmission efficiency is improved, but color accuracy deteriorates causing RGB value deviation and loss of special ink effects
Solution Approach 1:
The patent applies preliminary action by performing ink color separation conversion before compression. The look-up table is pre-configured with grid points that ensure special ink density values are maintained, so that even after lossy compression, the RGB values remain within the threshold range that preserves special ink effects. This preventive measure addresses color accuracy loss before it occurs during compression.
Solution Approach 2:
The patent changes parameters by modifying the look-up table structure to use non-adjacent grid points for special ink density values. This parameter change ensures that compressed image data with deviated RGB values still maps to appropriate ink density combinations that preserve fluorescent and metallic ink effects, thereby maintaining color accuracy despite compression.
2Adaptability or versatility
If replacement color technology is used to represent special inks, then compatibility with general applications is improved, but color reproduction reliability deteriorates when RGB values deviate due to compression
Solution Approach 1:
The patent applies local quality by treating special ink color separation differently from normal ink separation. The look-up table is designed with specific grid points that ensure special inks (fluorescent, metallic) receive dedicated density value assignments. This localized special handling ensures that even when RGB values deviate due to compression, the special ink effects are reliably reproduced by mapping to appropriate density values in the look-up table.
Solution Approach 2:
The patent performs preliminary action by pre-configuring the look-up table with grid points that guarantee special ink density values are assigned correctly. This preliminary setup ensures that when image data undergoes lossy compression and RGB values deviate, the color separation process still reliably produces the intended special ink effects, thereby maintaining color reproduction reliability.
3Device complexity
If adjacent grid points are used in the look-up table for simplicity, then device complexity is reduced, but manufacturing precision deteriorates as special ink effects cannot be reliably reproduced
Solution Approach 1:
The patent applies segmentation by dividing the RGB color space into a grid structure with specifically positioned grid points. The look-up table is segmented such that grid points are strategically placed to ensure proper separation of special ink density values. This segmented approach maintains manageable device complexity while achieving high ink color separation precision through the deliberate arrangement of grid points.
Solution Approach 2:
The patent changes parameters by configuring the look-up table with non-adjacent grid points for special ink density values. This parameter configuration ensures that when RGB values are converted to ink density values, special inks receive appropriate density assignments that preserve their visual effects. The non-adjacent grid point arrangement maintains manufacturing precision while keeping the device complexity manageable through systematic parameter selection.
Data Source
AI summary
In a predetermined look-up table, in which each of a plurality of grid points that are defined by dividing each axis of RGB color coordinates is associated with a combination of density values respectively corresponding to a plurality of inks to be used by a printing apparatus, the plurality of grid points include a plurality of first grid points, at which a density value of a predetermined ink among the plurality of inks does not correspond to 0, and a second grid point, at which the density value of the predetermined ink corresponds to 0, and the plurality of first grid points do not exist at points adjacent to each other in the plurality of grid points.