Color Conversion Profile Generation with Selective Spot Color Smoothing
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Solution Overview
Problem
Existing color conversion profile technologies that smooth all colors compromise color reproducibility, especially when spot colors are involved, making it difficult to achieve both gradation and accurate color representation.
Innovation Solution
An information processing apparatus that calculates and smooths values of spot colors in a device-dependent color system in response to changes in a device-independent color system, then uses these values to generate a color conversion profile, ensuring both gradation and color reproducibility by selectively smoothing changes in the device-dependent color system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If smoothing is performed on all colors in the color conversion profile, then gradation is improved, but color reproducibility is lowered
Solution Approach 1:
The invention segments the color conversion process into two distinct parts: spot color conversion (which requires high precision and is not smoothed) and process color conversion (which benefits from smoothing for gradation). This segmentation allows each part to be optimized independently, resolving the contradiction between gradation quality and color reproducibility.
Solution Approach 2:
The invention applies different quality requirements to different parts of the color conversion profile. Spot color values maintain high precision without smoothing, while process color values undergo smoothing to improve gradation. This local differentiation of quality standards enables both gradation improvement and color reproducibility preservation.
2Manufacturing precision
If smoothing is performed on all colors including spot colors, then gradation is improved, but spot color accuracy is lost
Solution Approach 1:
The invention clearly separates spot color conversion from process color conversion, applying smoothing only to the latter. This segmentation protects spot color accuracy while still enabling gradation improvement in the process colors, directly resolving the contradiction between these two requirements.
Solution Approach 2:
The invention extracts spot color values from the overall color conversion profile and handles them separately without smoothing. This extraction ensures that spot color accuracy is preserved while allowing smoothing to be applied to the remaining process colors for gradation improvement.
Data Source
AI summary
An information processing apparatus includes a processor configured to: for each of values in a target device-independent color system, calculate values of some colors in a device-dependent color system including a spot color; change the values of some colors in the device-dependent color system so as to smooth changes in the values of some colors in the device-dependent color system in response to changes in the values in the device-independent color system; and for each of the values in the target device-independent color system, based on the values of some colors in the device-dependent color system after the change, calculate values of remaining colors in the device-dependent color system, and generate a color-conversion profile with the values in the device-independent color system as input and the values of some colors in the device-dependent color system after the change and the values of the remaining colors in the device-dependent color system as output.