Windows Color System Overview Lavanya Vasudevan Program Manager Digital Documents Platform and Solutions microsoft.com Microsoft Corporation Michael Stokes Color Architect Digital Documents Platform and Solutions microsoft.com Microsoft Corporation

Session Outline Windows Color System (WCS) Motivation Color scenarios in Windows codenamed “Longhorn” Formalized framework User goals System behavior System design Windows Color System in Longhorn Color Infrastructure and Translation Engine (CITE) Infrastructure Baseline Models Plug-In Infrastructure ICM2 Improvements User Experience Enhancements Color in the Print Pipeline

Session Goals Attendees should leave this session with an understanding of: Design principles of Windows Color System Design details of the Windows Color System How to take best advantage of enhanced capabilities and opportunities for innovation Where to find more information How best to provide feedback

Longhorn Color Scenarios

WCS Use Case: End to End Workflow Goal: Accomplish End-to-End Color Workflow in Longhorn Primary Actor: PC-user Main Success Scenario: 1.PC-user connects all color-devices to the Longhorn-PC. 2.PC-user acquires color-document from color-input-device. 3.PC-user opens the color-document within a color-managed- application. 4.PC-user views the color-document within the color-managed- application in full screen mode on the display-device. 5.PC-user validates color-quality of displayed color-document. 6.PC-user prints the color-document from the color-managed- application to a local Metro-print-device. 7.PC-user validates color-quality of printed color-document.

WCS Use Case: WYSIWYG Goal: Validate Color Quality Primary Actor: PC-user Preconditions: PC-user is viewing the color-document within a color-managed- application in full screen mode on a display-device connected to a Longhorn-PC. PC-user has printed the color-document from the color-managed- application to a local Metro-print-device. Main Success Scenario: 1.PC-user compares the color-appearance of the color-document on the display-device, and the printed version of the color-document from the local Metro-print-device. 2.PC-user validates that the color-appearances match.

WCS Pipeline Gamut Map Model Device Model Color Appearance Model Color Appearance Model Device Model Gamut Map Model Profile Device Color Space Device-Independent Color Space CIEXYZ Color Appearance Space CIEJch Device Model Profiles A, B Color Appearance Model Profiles A, B

Baseline Device Models Objective intra-device measurements Baseline set for common devices built in Plug-in device models: Enhanced models for baseline devices Specialized models for new or high-end devices Pixel Values in Device Color Space Device Model Algorithms Pixel Values in CIEXYZ Device Model Profile (DMP) Measurements, Parameters

Color Appearance Model State-of-the-art Color Appearance Model built into platform Enables better handling of different viewing conditions CIECAM02 Algorithms Pixel Values in CIEXYZ Pixel Values in CIEJch Color Appearance Model Profile (CAMP) Viewing Condition Parameters

Gamut Mapping Model Subjective inter-device transforms Perceptually uniform Baseline set (≈ ICC rendering intents) built in Plug-in gamut mapping models: Proprietary algorithms Improvements on baseline models Gamut Map Model Algorithms Source Color Pixel Value in CIEJCh Destination Color Pixel Value in CIEJch Source Gamut Boundary Destination Gamut Boundary Rendering Intent or GMM from Gamut Map Model Profile (GMMP)

Support Functions Gamut Boundary Descriptors and Gamut Shells Pixel Formatter Samples in Device Color Space Device Model Color Appearance Model Derive Convex Hull Ordered Vertex List = Gamut Boundary Descriptor Pixels Raster or Vector Format Integers, Fixed Point, Float Pixel Formatter Pixels CITE Internal Pixel Format 32 bpc Float Normalized [0.0, 1.0] Transform Execution

Color Infrastructure and Translation Engine Pixel Values in Source Color Space Source DM Source CAM GMM Dest CAM -1 Dest DM -1 Pixel Values in Dest Color Space Gamut Boundary Functions Buffer of Samples in Source Color Space Internal Sequential Transform Buffer of Samples in Dest Color Space Source Colors Pixel Formatter Transform Cache Interpolate in Optimized Transform Look Up Table Pixel Formatter Destination Colors Sequential TransformOptimized TransformTransform Execution

New WCS APIs Work with new profile formats Enhanced functionality ICM2 Improvements Key bugs fixed Subset of current ICM2 APIs extended Work with new profiles Access CITE Continued ICC Support Improved v2 support Added v4 support

Color Control Panel Prototype

New Print Infrastructure “Metro” is the conduit for color Planned support for scRGB, named color, CMYK, n-channel Metro Print Path PrintTicket/PrintCapabilities

Windows Color System Roadmap A Staged Approach New color management infrastructure and developer platform Vehicle for vendor innovation Foundation for long-term investment XPPlanned for Longhorn CITECAM, DMs, GMMs, Plug-ins ICC SupportICM2 Bug Fixes V4 Support, ICM2 Bug Fixes, WinFX Profile Management WCS APIs, ICM2 Bug Fixes UI Central Control Panel Central Control Panel with WCS Support Calibration Wizard Display Device control Display (DDC/CI, VideoDAC), Print (PT/PC)

Call to Action Understand the Windows Color System Read WCS use cases Submit your own scenarios Send us feedback at microsoft.com Review the Metro v.7 specification and provide feedback to Start implementation with Beta 1! Visit the WinHEC Hardware Showcase and vendor booths in the exhibition!

Additional Resources Community Sites List of Newsgroups us/default.aspx Attend a free chat or webcast Locate a local user group(s) Non-Microsoft Community Sites MSDN Developer Community Chats: Printer Drivers -- Ask the Experts Online Windows Drivers: Printer Drivers Windows Drivers Printing and Networking

Additional Resources Web resources WS-Devices Profile: ?pull=/library/en-us/dnglobspec/html/devprof.asp Printer Working Group WHDC Printing home page: WHDC Still Imaging / WIA home page: WHDC Color home page: Color Use Cases “Writing Effective Use Cases”, Alistair Cockburn, ISBN For developer print questions: microsoft.com For developer scan questions: microsoft.com For developer color questions: microsoft.com Whitepaper On WinHEC CD “The Windows Color System in Longhorn”

Related Sessions: WinHEC 2005 April 25: Advances in Windows Printing Foundation Technologies for the Document Life Cycle Ask the Experts: Windows Color Windows Printing Windows Document Technology Avalon April 27: Avalon Imaging Codec Architecture: Overview New Document Life Cycle Opportunities

What’s in a Use Case? Usage narrative or story Warm up with a “day in the life” Actors and goals What are the system’s service promises? Main Success Scenario Top-to-bottom, typical scenario, goal delivery Extensions “Well, there’s a little complication…” Extension handling How should the system respond?

Use Cases Contracts About System Behavior Why do we care? Helps us: Discover behavioral requirements Link user goals, UI design, performance requirements, data formats, business rules… Structure project planning and priorities Describe the purpose, behavior, status and results Helps you: Evaluate system behavior Communicate new requirements