ASTM E1682-96(2001)

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

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: 09-May-1996
• ICS: 17.180.20 - Colours and measurement of light
• ICS: 35.180 - IT Terminal and other peripheral equipment
• Technical Committee: E12 - Color and Appearance
• Drafting Committee: E12.06 - Display, Imaging and Imaging Colorimetry

Relations

• Replaces: ASTM E1682-96 - Standard Guide for Modeling the Colorimetric Properties of a Visual Display Unit
• Effective Date: 10-May-1996
• Replaced By: ASTM E1682-05 - Standard Guide for Modeling the Colorimetric Properties of a Visual Display Unit
• Effective Date: 01-Jan-2005

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:E1682–96(Reapproved2001)
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 (e) 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 3.2 Acronyms:
3.2.1 CRT, n—an abbreviation for the term cathode ray
1.1 This guide is intended for use in establishing the
tube, a device for projecting a stream of electrons onto a
operating characteristics of a visual display unit (VDU), such
phosphor-coated screen in such a way as to display characters
as a cathode ray tube (CRT). Those characteristics define the
and graphics.
relationship between the digital information supplied by a
3.2.2 DAC, n—anabbreviationforthetermdigitaltoanalog
computer, which defines an image, and the resulting spectral
converter, a device for accepting a digital computer bit pattern
radiant exitance and CIE tristimulus values. The mathematical
and translating it into an analog voltage of a prescribed value.
descriptionofthisrelationshipcanbeusedtoprovideanearby
3.2.3 LUT, n—an abbreviation for the term look up table, a
device-independentmodelfortheaccuratedisplayofcolorand
process in which input and output values are mapped in an
colored images on the VDU. The CIE tristimulus values
n-dimensional table such that, for a given input value, the
referred to here are those calculated from the CIE 1931 2°
appropriate output value is “looked-up” from the table.
standard colorimetric (photopic) observer.
3.2.4 VDU, n—an abbreviation for the term visual display
1.2 This standard does not purport to address all of the
unit, a device interfaced to a computer for displaying text and
safety concerns, if any, associated with its use. It is the
graphics.
responsibility of the user of this standard to establish appro-
3.2.4.1 Discussion—A CRT is one type of VDU.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
4. Summary of Guide
2. Referenced Documents 4.1 Every color stimulus generated on aVDU is realized by
the linear (additive) superposition of the spectral power distri-
2.1 ASTM Standards:
2
bution of three primaries. Test Method E1336 describes how
E284 Terminology of Appearance
to measure the spectral power distributions and reduce them to
E1336 Test Method for Obtaining Colorimetric Data from
2
CIE tristimulus values. Practice E1455 describes how to
a Visual Display Unit by Spectroradiometry
measure the CIE tristimulus values of the primaries directly.
E1455 Practice for Obtaining Colorimetric Data from a
2 An exact characterization of the VDU would require measure-
Visual Display Unit Using Tristimulus Colorimeters
ment of the spectral power distribution at all possible combi-
3. Terminology nations of primary settings. Modern, computer-controlled
VDUs will provide 256 or more levels of each of the three
3.1 Definitions of appearance terms in Terminology E284
primaries. This results in more than 16777000 unique set-
are applicable to this guide.
tings, which is far too many combinations to be measured
practically (see Note 1). Instead, a characteristic function
1
This guide is under the jurisdiction of ASTM Committee E12 on Color and
relating the radiant output of the screen to the digital inputs
AppearanceandisthedirectresponsibilityofSubcommitteeE12.06onAppearance
fromthecomputermustbederived.Proceduresareoutlinedfor
of Displays .
deriving a characteristic function for a computer-controlled
Current edition approved May 10, 1996. Published July 1996. Originally
published as E1682–95. Last previous edition E1682–95b.
2
Annual Book of ASTM Standards, Vol 06.01.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

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E1682–96 (2001)
VDU, using a minimum number of spectral radiometric mea- for critical applications if this assumption is not met. The
surements while maintaining near optimum accuracy. Ex- amount of spectral variance will be a function of both position
amples of deriving and testing such models are given in andintensityofboththeareaofinterestandtheintegratedarea
Appendix X1. of pollution. Whil
...