Color Management Profile Replacement for Rendering and Un-rendering
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Solution Overview
Problem
Current color management systems face challenges in accurately converting between input-referred and output-referred image states, often resulting in information loss during the rendering process, especially when dynamic range adjustments are necessary for different devices.
Innovation Solution
The method involves obtaining source image data and transforming it using intermediate input-referred and output-referred color profiles, allowing for seamless mixing of content and enabling realistic visual effects through profile replacement, with specific profiles like HDTV and sRGB being used based on imaging workflows.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dynamic range adjustment is applied to convert input-referred image data to output-referred image data, then the image can be displayed on devices with limited dynamic range, but information about the image is lost in the rendering process
Solution Approach 1:
The patent introduces an intermediary rendering process that uses color management profiles as mediators between input-referred and output-referred image spaces. By employing profile connection spaces (PCS) and device-specific profiles, the system facilitates accurate transformation while preserving maximum image information through standardized intermediate representations.
Solution Approach 2:
The patent utilizes parameter changes in color space transformations, specifically adjusting luminance and chromaticity parameters through gamma correction and colorimetric transformations. These parameter changes enable dynamic range adaptation while maintaining image fidelity through mathematically reversible operations where possible.
2Adaptability or versatility
If rendering operations are performed to adapt image data for different output devices, then device-specific display requirements are met, but the process becomes complex and requires user knowledge of color management
Solution Approach 1:
The patent implements self-service color management where the system automatically selects and applies appropriate color profiles based on the source and destination devices. The color management module autonomously handles profile selection, transformation parameter calculation, and rendering operations without requiring user intervention or specialized knowledge of colorimetry.
Solution Approach 2:
The patent creates a universal color management framework that handles multiple device types (monitors, printers, cameras) through a single standardized interface. The profile connection space serves as a universal intermediary that enables consistent color transformations across diverse input and output devices, simplifying the overall system architecture.
3Measurement precision
If un-rendering is performed to convert output-referred image data back to input-referred image data, then the original image characteristics can be recovered, but the process is not completely accurate due to information loss
Solution Approach 1:
The patent applies preliminary action by preserving the original rendering parameters and profile information during the initial rendering process. This metadata is stored alongside the transformed image data, enabling more accurate reverse transformations. By maintaining records of the forward transformation operations, the system can apply inverse operations with higher fidelity.
Solution Approach 2:
The patent implements feedback mechanisms where the color management system continuously monitors and adjusts transformation parameters based on device characteristics and image content analysis. During un-rendering, feedback from device capability assessments and image quality metrics guides the reconstruction process to maximize recovery accuracy despite irreversible information loss.
Data Source
AI summary
Methods, systems, and apparatus, including medium-encoded computer program products, can perform rendering and un-rendering using profile replacement. A computer implemented method includes obtaining source image data associated with a source input-referred color space, transforming the source image data to intermediate image data associated with an intermediate input-referred color profile, applying a rendering operation to the intermediate image data by associating the intermediate image data with an intermediate output-referred color profile, and transforming the intermediate image data to destination image data associated with a destination output-referred color space using the intermediate output-referred color profile. The method further includes making available for output the destination image data.