Color Conversion Interpolation Table Generation for Image Formation
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Solution Overview
Problem
Conventional output data creating devices for image formation devices face challenges in accurately creating print data reflecting specific output conditions due to the need for numerous color conversion tables and compensation tables, leading to increased storage requirements and difficulties in achieving optimum color conversion when conditions are not met.
Innovation Solution
An output data creating device and program that uses an output condition obtaining unit, a table storage unit, and a combined color converting unit to interpolate and create an interpolation table or intermediate data based on stored color conversion tables, allowing for accurate color conversion even when a matching table is not available, thus reducing storage capacity requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple color conversion tables are prepared for all output conditions, then color conversion accuracy is improved, but storage capacity requirements increase
Solution Approach 1:
The patent segments the color conversion process into two parts: a base color conversion table for standard conditions, and separate compensation tables for specific printing conditions (ink type, recording sheet type, etc.). This segmentation allows the system to store fewer tables while maintaining accuracy by applying appropriate compensation only when needed.
Solution Approach 2:
The patent performs preliminary color conversion using a base table for standard conditions, then applies compensation tables only when specific printing conditions differ from the standard. This preliminary action approach avoids the need to pre-calculate and store separate color conversion tables for every possible condition combination.
2Measurement precision
If compensation tables are created for all printing conditions, then color conversion accuracy is improved, but the number of tables to manage increases
Solution Approach 1:
The patent applies local quality by creating compensation tables only for specific printing conditions that deviate from the standard (e.g., specific ink types or recording sheet types), rather than creating comprehensive tables for all possible conditions. This allows targeted compensation where needed while keeping the overall system simple.
Solution Approach 2:
The system performs preliminary color conversion using a base table, then selectively applies compensation only when specific printing conditions are detected. This preliminary action with conditional compensation reduces the number of tables needed while maintaining accuracy for relevant conditions.
3Speed
If the nearest color conversion table is used when an exact match is not available, then processing speed is improved, but color conversion accuracy deteriorates
Solution Approach 1:
The patent introduces compensation tables as intermediaries between the base color conversion table and the final output. When printing conditions differ from the standard, the compensation table acts as a mediator to adjust the color conversion results, bridging the gap between the nearest available table and the required accuracy for specific conditions.
Data Source
AI summary
An output data creating device creates output data to be used by an image formation device based on input data representing image to be formed. The data creating device includes an output condition obtaining unit that obtains output condition regarding image formation on the recording medium, a table storage unit that stores a plurality of color conversion tables meeting a plurality of predetermined conditions used for converting the input data to the output data, a combined color converting unit that converts the input data based on the output condition and a plurality of color conversion tables stored in the table storage unit when there is not a color conversion table that meets the output condition obtained by the output condition obtaining unit in the table storage unit, and an output data creating unit that creates the output data based on the input data that has been color-converted.