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ASTM E1682-05

(Guide)

Standard Guide for Modeling the Colorimetric Properties of a Visual Display Unit

Standard Guide for Modeling the Colorimetric Properties of a Visual Display Unit

SIGNIFICANCE AND USE
The color displayed on a VDU is an important aspect of the reproduction of colored images. The VDU is often used as the design, edit, and approval medium. Images are placed into the computer by some sort of capture device, such as a camera or scanner, modified by the computer operator, and sent on to a printer or color separation generator, or even to a paint dispenser or textile dyer. The color of the final product is to have some well-defined relationship to the original. The most common medium for establishing the relationship between input, edit, and output color (device-independent color space) is the CIE tristimulus space. This guide identifies the procedures for deriving a model that relates the digital computer settings of a VDU to the CIE tristimulus values of the colored light emitted by the primaries.
SCOPE
1.1 This guide is intended for use in establishing the operating characteristics of a visual display unit (VDU), such as a cathode ray tube (CRT). Those characteristics define the relationship between the digital information supplied by a computer, which defines an image, and the resulting spectral radiant exitance and CIE tristimulus values. The mathematical description of this relationship can be used to provide a nearby device-independent model for the accurate display of color and colored images on the VDU. The CIE tristimulus values referred to here are those calculated from the CIE 1931 2° standard colorimetric (photopic) observer.  
1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

Status
Historical
Publication Date
31-Dec-2004
ICS
17.180.20 - Colours and measurement of light
35.180 - IT Terminal and other peripheral equipment
Technical Committee
E12 - Color and Appearance
Drafting Committee
E12.06 - Display, Imaging and Imaging Colorimetry
Current Stage
Ref Project

Relations

Replaces
ASTM E1682-96(2001) - Standard Guide for Modeling the Colorimetric Properties of a Visual Display Unit
Effective Date
01-Jan-2005
Replaced By
ASTM E1682-08 - Standard Guide for Modeling the Colorimetric Properties of a CRT-Type Visual Display Unit
Effective Date
01-Dec-2008

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ASTM E1682-05 - Standard Guide for Modeling the Colorimetric Properties of a Visual Display Unit
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:E1682–05
Standard Guide for
Modeling the Colorimetric Properties of a Visual Display
1
Unit
This standard is issued under the fixed designation E1682; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
INTRODUCTION
This guide provides directions and mathematical models for deriving the relationship between
digital settings in a computer-controlled visual display unit and the resulting photometric and
colorimetricoutputofthedisplayunit.Theaccuratedeterminationofthisrelationshipiscriticaltothe
goal of accurate, device-independent color simulation on a visual display unit.
1. Scope 3. Terminology
1.1 This guide is intended for use in establishing the 3.1 Definitions of appearance terms in Terminology E284
operating characteristics of a visual display unit (VDU), such are applicable to this guide.
as a cathode ray tube (CRT). Those characteristics define the 3.2 Acronyms:
relationship between the digital information supplied by a 3.2.1 CRT, n—an abbreviation for the term cathode ray
computer, which defines an image, and the resulting spectral tube, a device for projecting a stream of electrons onto a
radiant exitance and CIE tristimulus values. The mathematical phosphor-coated screen in such a way as to display characters
descriptionofthisrelationshipcanbeusedtoprovideanearby and graphics.
device-independentmodelfortheaccuratedisplayofcolorand 3.2.2 DAC, n—anabbreviationforthetermdigitaltoanalog
colored images on the VDU. The CIE tristimulus values converter, a device for accepting a digital computer bit pattern
referred to here are those calculated from the CIE 1931 2° and translating it into an analog voltage of a prescribed value.
standard colorimetric (photopic) observer. 3.2.3 LUT, n—an abbreviation for the term look up table, a
1.2 This standard does not purport to address all of the process in which input and output values are mapped in an
safety concerns, if any, associated with its use. It is the n-dimensional table such that, for a given input value, the
responsibility of the user of this standard to establish appro- appropriate output value is “looked-up” from the table.
priate safety and health practices and determine the applica- 3.2.4 VDU, n—an abbreviation for the term visual display
bility of regulatory limitations prior to use. unit, a device interfaced to a computer for displaying text and
graphics.
2. Referenced Documents
3.2.4.1 Discussion—A CRT is one type of VDU.
2
2.1 ASTM Standards:
4. Summary of Guide
E284 Terminology of Appearance
E1336 Test Method for Obtaining Colorimetric Data from 4.1 EverycolorstimulusgeneratedonaVDUisrealizedby
a Visual Display Unit by Spectroradiometry the linear (additive) superposition of the spectral power distri-
E1455 Practice for Obtaining Colorimetric Data from a bution of three primaries. Test Method E1336 describes how
Visual Display Unit Using Tristimulus Colorimeters tomeasurethespectralpowerdistributionsandreducethemto
CIE tristimulus values. Practice E1455 describes how to
measure the CIE tristimulus values of the primaries directly.
1
This guide is under the jurisdiction of ASTM Committee E12 on Color and
An exact characterization of the VDU would require measure-
AppearanceandisthedirectresponsibilityofSubcommitteeE12.06onAppearance
ment of the spectral power distribution at all possible combi-
of Displays.
nations of primary settings. Modern, computer-controlled
Current edition approved Jan. 1, 2005. Published January 2005. Originally
approved in 1995. Last previous edition approved in 2001 as E1682–96(2001).
VDUs will provide 256 or more levels of each of the three
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
primaries. This results in more than 16777000 unique set-
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
tings, which is far too many combinations to be measured
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. practically (see Note 1). Instead, a characteristic function
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
E1682–05
relating the radiant output of the screen to the digital inputs measurements with pixels near the edge of the display illumi-
fromthecomputermustbederived.Proceduresareoutlinedfor nated fully. The display may have to be considered unusable
deriving a characteristic function for a computer-controlled for critical applications if this assumption is not met. The
VDU, using a mini
...

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