色彩管理技术PPTAnIntroductiontoColorManagement.ppt

An Introduction to Color Management Cindy Starr NASA Goddard Code 588, InVision Global Science Technology, Inc Presentation Outline Goals Objectives of Color Management History of Color Management Functions and Architecture Steps in Color Management Color Management in Application Development Color Management and the Web Goal Of Color Management To provide consistent and accurate display of color among multiple input, display and output devices Minimize the perceived differences in displayed colors between devices Why is Color Mgmt Necessary? The different devices have different gamuts or ranges of colors that it is capable of reproducing Every input, display and output device has a specific range of colors, determined by the physical and chemical properties of the medium Device-dependent colors don’t match from device to device WYS  is not  WYG Cameras: Different image capturing technologies Scanners: Light source, optical path, sensor, electronics, firmware and software, media (reflective or transparent) Monitors: Types of CRT’s, tolerances in phosphors, different video boards, ambient lighting conditions, aging of CRT Printers: Different color processes, different imaging technologies, different inks, toners, paper, different device drivers History - The Commission Internationale de L’Eclairege International Committee on Illumination (CIE) An autonomous international organization renown for its expertise in the science and art of lighting recognized by ISO as an international standardization body 1931 - Defined the Standard Observer based on color matching experiments with individuals with normal color vision Adopted a set of color matching functions known as CIE Tristimulus Values Light Object Standard CIE Tristimulus Source * Reflectance * Observer =