Dynamic Scanner Profile Correction for Printer Color Gamut
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Solution Overview
Problem
Conventional methods for creating and correcting scanner profiles are time-consuming and resource-intensive, as they require recreating the profile from scratch, and fail to accurately reflect changes in a printer's color gamut, leading to degraded color conversion accuracy.
Innovation Solution
A printer system with an in-line scanner and color measurement device that prints specific color charts to determine and correct the scanner profile by associating RGB values with color measurement values, allowing for dynamic adjustment of the scanner profile to match the printer's current color gamut, thereby maintaining accurate color conversion without the need for extensive recalibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a scanner profile is created by measurement of a color chart printed with a printer, then the scanner profile can be created, but a change in the printer or printing conditions may affect an accuracy of color conversion using the scanner profile
Solution Approach 1:
The patent applies preliminary action by determining the printer's color gamut boundaries in advance using a second color chart with specific color patches, and storing this information for later use. This allows the system to proactively adapt to printer changes without waiting for actual color conversion errors to occur, thereby maintaining accuracy when printer conditions change.
Solution Approach 2:
The patent implements feedback by continuously monitoring the relationship between RGB values and color measurement values, comparing actual color gamut boundaries with the stored scanner profile, and automatically correcting the profile when deviations are detected. This closed-loop feedback mechanism ensures the scanner profile remains accurate even when printer conditions change.
2Measurement precision
If conventional methods are used to correct a scanner profile, then the scanner profile can be corrected, but these methods need sufficient time to correct a scanner profile and may waste time and resources
Solution Approach 1:
The patent segments the color chart into two distinct parts: a first color chart with multiple color patches for comprehensive profile creation, and a second color chart with specific color patches on the color gamut boundary for efficient gamut determination. This segmentation allows the system to use only the necessary second color chart for corrections, significantly reducing the time and resources required compared to recreating the entire profile from scratch.
Solution Approach 2:
The patent applies partial action by using only the minimal necessary data (specific color patches on the gamut boundary from the second color chart) to correct the scanner profile, rather than performing a complete profile recreation. This partial measurement approach is sufficient to detect and correct printer changes while minimizing time and resource consumption.
3Adaptability or versatility
If a color chart is output for creating a scanner profile each time the profile is corrected, then the profile can be updated, but this process may waste time and resources
Solution Approach 1:
The patent extracts and utilizes only the essential information needed for profile correction by using a second color chart that contains specifically designed color patches representing the color gamut boundary. This extraction approach allows the system to obtain sufficient correction data without outputting a complete color chart, thereby reducing resource waste while maintaining the ability to update the profile.
Data Source
AI summary
Provided are a printer, a non-transitory computer-readable storage medium and a scanner-profile creation method. In a printer including a print engine, a scanner and a color measurement device, or a printing system including a printer, a scanner and a color measurement device, a controller creates a scanner profile by using RGB values and color measurement values obtained by measuring a first color chart with the scanner and color measurement device, and determines a first color gamut and a second color gamut of the printer by using one or both of RGB values and color measurement values obtained by measuring the first color chart and a second color chart, respectively, where the second color chart includes at least color patches in specific colors representing a color gamut of the printer. The controller further corrects the scanner profile by comparing the first color gamut and the second color gamut.