Prior art

US Patent 9185268, titled "Methods and systems for displays with chromatic correction with differing chromatic ranges," addresses the challenge of ensuring consistent color reproduction on displays with varying color gamuts. The patent's priority date is April 3, 2007, and its publication date is November 10, 2015. The invention focuses on workflows for color correction and mastering, specifically either generating metadata for color gamut mapping (CGM) to adapt content from a non-reference color gamut (CG2) master for reference color gamut (RCG) displays (Claims 1-5, 12-14, 20-24), or creating two distinct masters (one for CG2, and a derivative one for RCG via CGM) (Claims 6-11, 15-19, 25-30).

The following prior art references are identified as most relevant based on their publication/filing dates preceding the priority date of US9185268 (April 3, 2007) and their titles indicating pertinence to color management, gamut mapping, or handling extended color spaces.

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Most Relevant Prior Art for US9185268:

1. US6947589B2

• Full Citation: US6947589B2, "Dynamic gamut mapping selection", Canon Kabushiki Kaisha (Assignee), Newman, Todd D. (Inventor).
• Publication/Filing Date: Filing Date: 2001-09-20; Publication Date: 2005-09-20.
• Brief Description: This patent describes a system and method for dynamically selecting a gamut mapping function for an image based on image quality parameters and local image characteristics. The goal is to process an image for display or printing such that colors that fall outside the target device's color gamut are appropriately mapped to enhance image quality.
• Potential Anticipation Analysis: This reference potentially anticipates the general concept of applying color gamut mapping to adapt content for a display. However, it does not explicitly teach the specific workflow of US9185268, which involves mastering content only for a non-reference type display (CG2) and then generating metadata for a subsequent color gamut mapping to transform this mastered content for display on reference type displays (RCG) (Claims 1, 12, 20). Nor does it explicitly describe creating a derivative master for RCG displays from a CG2 master (Claims 6, 15, 25). Its focus is on dynamic selection of CGM functions based on image characteristics.

2. WO2006050305A1

• Full Citation: WO2006050305A1, "Method and system for mastering and distributing enhanced color space content", Technicolor Inc (Assignee), Doser, Ingo Tobias; Mantiuk, Rafał Kazimierz; Seetzen, Helge K.; Whitehead, Lorne A. (Inventors).
• Publication/Filing Date: Filing Date: 2004-11-01; Publication Date: 2006-05-11.
• Brief Description: This patent describes a method and system for mastering and distributing content with an "enhanced color space". The method includes receiving content with an original color space, converting it to a master content in an enhanced color space, and generating metadata describing both the original and enhanced color spaces. This master content and metadata are then distributed.
• Potential Anticipation Analysis: This reference is highly relevant as it describes "mastering" content in an "enhanced color space" (analogous to US9185268's non-reference color gamut) and generating "metadata" describing color spaces for distribution. The concept of generating metadata for subsequent color space transformations directly relates to generating metadata for a color gamut mapping to transform mastered content for a reference type display. Thus, it potentially anticipates elements of claims 1, 12, and 20, particularly the aspect of "generating metadata for a color gamut mapping that color transforms the mastered color corrected picture content for display on reference type displays having a reference color gamut". However, the specific inventive steps of US9185268 concerning the direction of the mastering (CG2 first, then metadata for RCG) and the explicit "color correction" workflow for "predictable results" might still provide differentiation. It does not clearly anticipate the creation of two distinct masters as per claims 6, 15, and 25.

3. EP1578140A2

• Full Citation: EP1578140A2, "System and method for color management", Thomson Licensing S.A. (Assignee), Doser, Ingo Tobias; Boes, Stefan; Weick, Torsten; Stauder, Jurgen; Lee, Bongsun (Inventors).
• Publication/Filing Date: Filing Date: 2004-03-19; Publication Date: 2005-09-21.
• Brief Description: This patent discloses a method for color management in an image processing chain to display an image on a device with a native color gamut. It involves converting image colors from a source color gamut into a target color gamut using a color gamut mapping (CGM) algorithm, and evaluating an optimal CGM algorithm based on source image and target display characteristics.
• Potential Anticipation Analysis: This reference, co-invented by some of the inventors of US9185268, generally describes color management and color gamut mapping between source and target gamuts. It could potentially anticipate the broad concept of "performing color correction on source picture content, using a color gamut mapping" found in claims 1, 6, 12, 15, 20, 25. However, it does not explicitly detail the specific workflows of US9185268, such as mastering content primarily for a non-reference display and then generating metadata for a reference display, or creating a derivative RCG master.

4. US6282312B1

• Full Citation: US6282312B1, "System using one or more residual image(s) to represent an extended color gamut digital image", Eastman Kodak Company (Assignee), MacDonald, Lindsay W.; Braud, John W. (Inventors).
• Publication/Filing Date: Filing Date: 1998-09-28; Publication Date: 2001-08-28.
• Brief Description: This system represents a digital image with an extended color gamut by converting it into a base image within a standard color gamut and one or more residual images that capture the differences. The base and residual images are stored, allowing for reconstruction of the extended color gamut image for display on an extended color gamut device.
• Potential Anticipation Analysis: This patent is relevant for its approach to handling "extended color gamut" images and providing information (residual images) for their display on different gamut devices. This could potentially anticipate aspects related to handling different color gamuts and storing transformation-related data (like metadata) for different displays. However, it focuses on an encoding/storage and reconstruction method rather than the specific "color correction" and "mastering" workflow for predictable results across differing display types described in US9185268's claims.

5. US6754384B1

• Full Citation: US6754384B1, "Method for processing an extended color gamut digital image using an image information parameter", Eastman Kodak Company (Assignee), MacDonald, Lindsay W.; Braud, John W. (Inventors).
• Publication/Filing Date: Filing Date: 2000-08-30; Publication Date: 2004-06-22.
• Brief Description: This method involves receiving an extended color gamut digital image, obtaining an image information parameter for it, and then producing a standard color gamut digital image from the extended gamut image and the parameter. The resulting standard gamut image is suitable for display on a standard color gamut device.
• Potential Anticipation Analysis: This reference is highly relevant, as it describes a process that takes an "extended color gamut digital image" (analogous to content for a non-reference type display) and produces a "standard color gamut digital image" (analogous to content for a reference type display) using an "image information parameter" (analogous to metadata or a color gamut mapping). This directly parallels the concept in US9185268's claims 6, 15, and 25, which involve mastering for a non-reference type display and then using a color gamut mapping to provide mastered content for a reference type display, where the RCG master is a "derivative" of the CG2 master. It also touches upon elements of claims 1, 12, and 20 concerning the use of parameters/metadata for conversion. This patent offers strong potential anticipation for the core concepts of deriving standard gamut content from extended gamut content.