ASTM E1541-98(2003)

Standard Practice for Specifying and Matching Color Using the Colorcurve System (Withdrawn 2007)

SCOPE
1.1 This practice provides a means for specifying the colors of objects in terms of the Colorcurve system. Both computational and visual methods are included. This practice is applicable to inked, painted, dyed, or mass-colored surfaces viewed by an observer with normal color vision.
1.2 This practice includes a method for producing a color specimen to match a Colorcurve sample.
1.3 This practice does not cover the preparation of specimens. If specimen preparation is required in conjunction with this practice, a mutually agreed upon procedure shall be established.
1.4 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.
WITHDRAWN RATIONALE
This practice provides a means for specifying the colors of objects in terms of the Colorcurve system. Both computational and visual methods are included. This practice is applicable to inked, painted, dyed, or mass-colored surfaces viewed by an observer with normal color vision.
Formerly under the jurisdiction of Committee E12 on Color and Appearance this practice was withdrawn in June 2007.
This standard is being withdrawn without replacement because the materials for this system are no longer available.

General Information

• Status: Withdrawn
• Publication Date: 09-Jul-2003
• Withdrawal Date: 03-Jun-2007
• ICS: 17.180.20 - Colours and measurement of light
• Technical Committee: E12 - Color and Appearance
• Drafting Committee: E12.07 - Color Order Systems

Relations

• Replaces: ASTM E1541-98 - Standard Practice for Specifying and Matching Color Using the Colorcurve System
• Effective Date: 10-Jul-2003
• Referred By: ASTM D3134-15(2019) - Standard Practice for Establishing Color and Gloss Tolerances
• Effective Date: 10-Jul-2003
• Referred By: ASTM D5382-02(2017) - Standard Guide to Evaluation of Optical Properties of Powder Coatings
• Effective Date: 10-Jul-2003
• Referred By: ASTM E313-20 - Standard Practice for Calculating Yellowness and Whiteness Indices from Instrumentally Measured Color Coordinates
• Effective Date: 10-Jul-2003
• Referred By: ASTM D3794-22 - Standard Guide for Testing Coil Coatings
• Effective Date: 10-Jul-2003

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:E1541–98(Reapproved2003)
Standard Practice for
Specifying and Matching Color Using the Colorcurve
1
System
This standard is issued under the fixed designation E1541; 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
2
The COLORCURVEt System provides a systematic array of color samples whose arrangement
has a simple relationship to the international CIE 1964 system, described in Test Method E308 and
used widely in industry to specify color and color differences from instrumental measurements. The
system is based on four main elements: (1) aim points displayed on CIE (CIELAB) a*, b* planes at
constant L*; (2) atlases containing physical representations of those aim points; (3) tables of spectral
andcolorimetricdataforthoseaimpoints;and(4)computationalmethodsandcomputersoftwarethat
furnish Colorcurve notations and reflectances when CIE data are entered, or tristimulus values and
reflectance data when Colorcurve notations are entered. The tristimulus data can be used in color
formulation software to formulate specimens with minimum metamerism to the atlas samples.
The Master Atlas consists of 1231 atlas samples approximating the computed aim points and the
correspondingdatatables.AseparateGrayandPastelAtlascontains956additionalsamples,foratotal
of 2187 unique samples.
1. Scope D1729 Practice for Visual Appraisal of Color and Color
3
Differences of Diffusely-Illuminated Opaque Materials
1.1 This practice provides a means for specifying the colors
3
E284 Terminology of Appearance
of objects in terms of the Colorcurve system. Both computa-
E308 Practice for Computing the Colors of Objects by
tional and visual methods are included. This practice is
3
Using the CIE System
applicable to inked, painted, dyed, or mass-colored surfaces
E1164 Practice for Obtaining Spectrophotometric Data for
viewed by an observer with normal color vision.
3
Object-Color Evaluation
1.2 This practice includes a method for producing a color
specimen to match a Colorcurve sample.
3. Terminology
1.3 This practice does not cover the preparation of speci-
3.1 Definitions of appearance terms in Terminology E284
mens. If specimen preparation is required in conjunction with
are applicable to this practice.
this practice, a mutually agreed upon procedure shall be
3.2 Definitions:
established.
3.2.1 chromaticness, n—the attribute of visual sensation
1.4 This standard does not purport to address all of the
combining the hue and saturation.
safety concerns, if any, associated with its use. It is the
3.2.2 hue, n—the attribute of color perception by means of
responsibility of the user of this standard to establish appro-
whichanobjectisjudgedtobered,yellow,green,blue,purple,
priate safety and health practices and determine the applica-
or intermediate between some adjacent pair of these, consid-
bility of regulatory limitations prior to use.
ered in a closed ring (red and purple being an adjacent pair).
2. Referenced Documents 3.3 Definitions of Terms Specific to This Standard:
3.3.1 Colorcurve atlas, n—physical exemplification of the
2.1 ASTM Standards:
Colorcurve system, consisting of a three-dimensional array of
2187 samples displayed on CIELAB cartesian coordinates in
1 two atlases.
This practice is under the jurisdiction ofASTM Committee E12 on Color and
AppearanceandisthedirectresponsibilityofSubcommitteeE12.07onColorOrder 3.3.2 Colorcurve system, n—a color order system based on
Systems.
theCIE1964space,whichusestheCIELAB L*lightnessscale
Current edition approved July 10, 2003. Published July 2003. Originally
approved in 1993. Last previous edition approved in 1998 as E1541–98.
2
Colorcurvet is a registered U.S. trademark used byASTM International under
theauthorizationofColorcurveSystems,Inc.AspectsofColorcurvetechnologyare
3
covered by U.S. Patent 5012482. 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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E1541–98 (2003)
( L* = L) and in which chromaticity is represented by 4.2 Computation Method of Determining Colorcurve
opponent-color scales R/G (reds-greens) and Y/B (yellows- Notations—CIE 1964 tristimulus values for standard illumi-
blues).
nant D65 and the 1964 supplementary (10°) standard observer
3.3.3 lattice scaling constant, n—ratio of the distance be-
are obtained from spectrophotometric or spectrocolorimetric
tween adjacent samples at a system boundary (CIELAB
measurements. See Practice E308 and Practice E1164.Avail-
chroma C*=60foramajorormino
...