Generation of color measurements from transform-based color profiles and creation of transform-based profiles by a measurement-based color management system
A description file, color processing technology, applied in the field of color management system, can solve problems such as difficult implementation
Inactive Publication Date: 2011-11-02
CANON KK +1
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Problems solved by technology
This is difficult to achieve when some profiles are measurement-based and intelligence is in the CMM, while others are transformation-based and intelligence is in the profile builder
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[0057] The present invention provides a color management method for mathematically producing color measurements from color transforms in transform-based color profiles. The resulting color measurements are used as color measurement data profiles in a measurement-based color management system.
[0058] Generally speaking, the present invention is practiced in a computing environment. A representative computing system may include computing devices, peripherals, and digital devices for jointly implementing the present invention. The computing device includes a host processor including a personal computer (hereafter referred to as a PC), preferably an IBM-PC compatible computer, having a Windows environment such as Microsoft Windows 98, Windows 2000, Windows Me., Windows XP or Windows NT, or other Windows systems such as LINUX. In the alternative, the host processor may be an Apple computer or other non-windows-based computer. The computing device also includes a color monitor ...
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Color measurements are generated from transform-based device profiles for use in a measurement-based color management system. The color measurements are generated by providing device-dependent color samples to a transform-based color management module and converting them to the profile connection space with the device's transform-based profile. Color measurements are then generated from the transform-based color management module by applying an identity profile in place of a destination device profile. In addition, measurement data can be extracted directly from either the tone reproduction curve / matrix or n-dimensional lookup table transforms contained within a transform-based device profile. In addition, a method and apparatus for generating transform-based color profiles by a measurement-based Color Management System (CMS) is provided. The measurement-based CMS generates the transform-based profile wherein the measurement-based color system is parameterized by color data and procedures. The CMS may use a reference Profile Connection Space (PCS) loaded from a measurement profile, thus enabling user configuration of the generation process. The reference PCS may also be set to include a gamut that is appropriate for an eventual color-output device. In addition, a Gamut Mapping Model (GMM) used in the generation process is user-selectable as well as a Device Model (DM). The DM may also be supplied as a pluggable module. The CMS also features user-selectable mapping from an International Color Consortium (ICC) intent to a PCS profile and to a DM. The features of the CMS may be used in an application, stand-alone profiling tool or in an operating system utility.
Description
technical field [0001] The present invention relates generally to color management systems (CMS), and more particularly to measurement-based CMSs that can generate transformation-based profiles automatically or under user control, and to the generation of transformation-based color profiles for measurement-based color management A color management system for systematic color measurement. Background technique [0002] Generally speaking, color management systems utilize standardized transformation-based color profiles to convert color image data between device-dependent and device-independent color spaces. Such transform-based color profiles are typically created by the hardware manufacturer of a given color device, such as a printer or digital camera. In general, transformation-based color profiles are designed to meet the specifications set forth by the International Color Consortium (ICC). The name of the current specification is Specification ICC.1:2003-09, File Format ...
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IPC IPC(8): G06F15/00G06K9/00G06T7/40H04N1/60
CPCH04N1/6058G06T7/408H04N1/6033G06T7/90G06T7/40G06F18/00
Inventor 约翰·S·海金托德·D.·纽曼
Owner CANON KK