Image Processing for Color Matching Before and After Lamination
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Solution Overview
Problem
Existing image processing methods require significant time and effort to create and manage profiles for color matching before and after lamination processing, making the process inefficient.
Innovation Solution
An image processing method and apparatus that converts input device colors to output device colors using spectral reflectance conversion formulas, allowing for easier color matching by calculating a second output device color using spectral reflectance before lamination processing, reducing the need for post-lamination profiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a profile is created based on characteristics before and after lamination processing to determine color reproduction, then color matching accuracy is improved, but time and effort for profile creation and management increase
Solution Approach 1:
The patent uses a spectral reflectance mutual conversion formula that copies the relationship between pre-lamination and post-lamination spectral characteristics. Instead of creating a new profile after lamination, the system calculates the post-lamination spectral reflectance by applying the conversion formula to the pre-lamination spectral reflectance, effectively copying the transformation characteristics without requiring physical measurement and profile creation after lamination.
Solution Approach 2:
The patent performs preliminary action by measuring and storing the spectral reflectance characteristics before lamination processing. The spectral reflectance mutual conversion formula is established in advance, allowing the system to predict post-lamination color characteristics without requiring actual post-lamination measurement. This preliminary characterization enables efficient color matching without repeated profile creation.
2Manufacturing precision
If spectral reflectance conversion formulas are used to convert input device colors to output device colors, then color reproduction before lamination is improved, but the complexity of color conversion processing increases
Solution Approach 1:
The patent introduces spectral reflectance as an intermediary between input device colors and output device colors. Instead of directly converting between device color spaces, the system uses spectral reflectance characteristics as a mediator. The spectral reflectance mutual conversion formula acts as an intermediary transformation that accounts for lamination effects, enabling accurate color prediction through a standardized intermediate representation.
Solution Approach 2:
The patent changes the parameter representation from device-specific color values to spectral reflectance parameters. By transforming color information into spectral reflectance domain, the system can apply the mutual conversion formula that captures the physical effect of lamination. This parameter transformation enables more accurate color prediction by working with fundamental optical properties rather than device-dependent color values.
Data Source
AI summary
An image processing method includes: converting a device color CMYK1 that is an input device color depending on an input device into a device color CMYK2 that is an output device color depending on an output device; converting the device color CMYK2 into a spectral reflectance R1 using an output profile showing a relationship between the output device color and a spectral reflectance; converting the spectral reflectance R1 into a spectral reflectance R2, to be reproduced before lamination processing, using a mutual conversion formula of a spectral reflectance before lamination processing and a spectral reflectance after lamination processing; and calculating a device color CMYK3 that is an output device color using the spectral reflectance R2, the output profile, and light source information.