Color Conversion Table Creation Using Identical Colorimeter
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Solution Overview
Problem
The existing color conversion methods in printing technologies face accuracy issues when creating color conversion tables using different colorimeters, leading to deteriorated color matching accuracy.
Innovation Solution
A color conversion table creation apparatus and method that reads a target printed article, converts signal values into chromaticity values using a color conversion table, and performs multi-dimensional correspondence relationships between color spaces to create an output device color conversion table, allowing for high accuracy color matching without the need for separate color charts or profiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If different colorimeters are used to create source profile and destination profile, then the profiling process can be completed, but color matching accuracy deteriorates
Solution Approach 1:
The patent merges the source profile creation and destination profile creation processes by using the same colorimeter for both measurements. This eliminates the inconsistency between different measurement devices and ensures that both profiles are based on identical measurement characteristics, thereby maintaining high color matching accuracy while completing the profiling process.
Solution Approach 2:
The patent applies homogeneity by using the same colorimeter (identical measurement device) for both source and destination profile creation. This ensures uniform measurement conditions and eliminates variability introduced by device differences, resulting in consistent and accurate color matching across the entire profiling workflow.
2Ease of operation
If traditional ICC profile method is used with separate source and destination profiles, then color conversion can be performed, but the process requires multiple separate profiling steps
Solution Approach 1:
The patent combines multiple separate profiling steps into a single integrated process. By using the same colorimeter to create both source and destination profiles in one workflow, the patent eliminates the need for separate profiling operations, reducing process complexity while maintaining full color conversion capability.
Solution Approach 2:
The patent makes the colorimeter universal by using it for multiple functions: creating both source profiles and destination profiles. This multi-functional approach eliminates the need for separate specialized profiling procedures, simplifying the overall process while preserving color conversion effectiveness.
Data Source
AI summary
Provided are a color conversion table creation apparatus and method, a color conversion apparatus, and a program capable of further increasing color matching accuracy. A color conversion table creation apparatus includes an image reading unit (30) that acquires read image data of a target printed article, a first color conversion unit (64) that performs color conversion by using a first color conversion table representing a correspondence relationship between a signal value of a first color space obtained from the image reading unit (30) and a chromaticity value of a second color space which is a device-independent color space, an image correlation unit (62) that performs correlation of a positional relationship between the read image data or read chromaticity value image data converted into a chromaticity value and original document image data, and a color conversion table creation unit that creates a second color conversion table representing a multi-dimensional correspondence relationship between a third color space of the original document image data and a second color space on the basis of a correspondence relationship between the original document image data and a chromaticity value of a read image, in which a first printed article which is printed by a printing apparatus (18) on the basis of first image data is read by the image reading unit (30), and thus an output device color conversion table (94A) is created.