Profile Adjustment for Black Point Compensation in Color Conversion
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Solution Overview
Problem
Existing color conversion technologies face challenges in accurately adjusting profiles for black point compensation, leading to inconsistencies in color reproduction and gradation collapse during the conversion process between different devices, as the black point information is not effectively stored or managed in the profile adjustment process.
Innovation Solution
A method and apparatus for adjusting profiles used in color conversion processing that involves receiving an adjustment target profile, storing black point information from a color conversion table in a private tag if not already present, and performing black point compensation based on this information to maintain consistent color reproduction effects during the conversion process from input to output device coordinates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If black point compensation is performed during color conversion, then color reproduction accuracy is improved, but user-adjustment effects on the color conversion table may not be obtained due to automatic black point compensation interfering with manual adjustments
Solution Approach 1:
The patent extracts black point information from the color conversion table and stores it separately in a private tag within the profile. This separation allows the system to preserve the original black point characteristics while enabling user adjustments to the color conversion table, resolving the conflict between automatic black point compensation and user-adjustment flexibility
Solution Approach 2:
The patent performs preliminary extraction and storage of black point information before any color conversion or user adjustment operations. By preparing this information in advance in a dedicated storage location, the system can maintain consistent black point compensation effects while allowing users to adjust other aspects of the color conversion table
2Measurement precision
If the color conversion table is adjusted to improve color reproduction accuracy, then color accuracy is improved, but the intended adjustment effect may be lost due to black point compensation performed by the color management system
Solution Approach 1:
The patent introduces a private tag as an intermediary structure that stores black point information separately from the color conversion table. This intermediary allows the system to maintain the intended adjustment effects in the color conversion table while applying black point compensation based on the stored black point information, ensuring both color accuracy and adjustment consistency
3Device complexity
If black point information is not stored in the profile, then profile structure remains simple, but black point compensation cannot be reliably performed after color conversion table adjustments
Solution Approach 1:
The patent segments the profile structure into distinct components: the color conversion table for general color mapping and a private tag for storing black point information. This segmentation allows the system to maintain reliable black point compensation while keeping the overall profile structure organized and manageable
Data Source
AI summary
Disclosed is a profile adjustment method for adjusting a profile used in color conversion processing for performing a black point compensation, the method including: an adjustment target profile reception step of receiving any one of an input profile representing a correspondence relationship between an input coordinate values in an input color space and device independent coordinate values in a profile connection space and an output profile representing a correspondence relationship between the device independent coordinate values and an output coordinate values in an output color space as an adjustment target profile; a black point information storage step of obtaining black point information from a color conversion table and storing the black point information in a private tag when the black point information representing a black point in the color conversion table is not stored in the private tag of the adjustment target profile before adjusting the color conversion table stored in the adjustment target profile; and an adjustment reception step of receiving an adjustment of the color conversion table.