ASTM E2970-2015 Standard Practice for Specifying Color by the Natural Colour System (NCS)《采用自然色彩系统 (NCS) 规定颜色的标准实施规程》.pdf
《ASTM E2970-2015 Standard Practice for Specifying Color by the Natural Colour System (NCS)《采用自然色彩系统 (NCS) 规定颜色的标准实施规程》.pdf》由会员分享,可在线阅读,更多相关《ASTM E2970-2015 Standard Practice for Specifying Color by the Natural Colour System (NCS)《采用自然色彩系统 (NCS) 规定颜色的标准实施规程》.pdf(11页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: E2970 14E2970 15Standard Practice forSpecifying Color by the Natural Colour System (NCS)1This standard is issued under the fixed designation E2970; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revis
2、ion. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 The Natural Colour System (NCS) (see 1.7) provides a color notation system that can be used to communicate color. Thispractice i
3、ntroduces the Natural Colour System, its terminology, and conversion to and from CIE tristimulus values.1.2 The system described in this standard includes color percepts that appear to belong to the surface of a material, providedthe surface is not perceived to be fluorescent or to exhibit direction
4、al color effects.1.3 The system does not include colors that appear to belong to translucent or luminescent objects (so-called volume colors andluminous colors), nor does it include other visual properties of the surface layer, such as gloss and texture. An NCS notation doesnot describe the physical
5、 or chemical properties of an object.1.4 This practice also specifies the conditions for visual or instrumental determination of the NCS notation of a color sample,defines the relationships between psychometrically determined NCS notations and the corresponding CIE color coordinates whichare to be u
6、sed in this context.1.5 For the accuracy requirements associated with NCS standards and NCS color samples, the user is referred to SwedishStandard SS 01 91 04 (E).19104. The colored illustrations in this standard shall not be used as standard color samples in any way.Color illustrations that are sho
7、wn on screen or in printouts may be significantly different than the original NCS color samples withthe same NCS Notation due to limited color reproduction capabilities in screens and printers.1.6 The values stated in SI units are to be regarded as standard. No other units of measurement are include
8、d in this standard.1.7 AcknowledgementNCS, Natural Colour System is a trademark of the NCS Colour AB Stockholm, Sweden and is protectedby copyright (). All rights reserved. Original NCS color samples are only available form NCS Colour AB orany authorized NCS distributor. Commercial use of the NCS Sy
9、stem requires a license from NCS Colour AB.1.8 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety and health practices and determine the applicability of regulator
10、ylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:2E284 Terminology of AppearanceE308 Practice for Computing the Colors of Objects by Using the CIE SystemE1164 Practice for Obtaining Spectrometric Data for Object-Color Evaluation2.2 Swedish Standards:3SS 01 91 0019100 Colour Notati
11、on systemSS 19102:2004 NCS Colour AtlasSS 01 91 04 (E)19104 NCS colour samples Observation and measurement conditions and tolerances2.3 Other Documents:4CIE 15:2004 Colorimetry1 This practice is under the jurisdiction of ASTM Committee E12 on Color and Appearance and is the direct responsibility of
12、Subcommittee E12.07 on Color OrderSystems.Current edition approved May 1, 2014Dec. 1, 2015. Published January 2015December 2015. Originally approved in 2014. Last previous edition approved in 2014 as E2970 14. DOI: 10.1520/E2970-14.10.1520/E2970-15.2 For referencedASTM standards, visit theASTM websi
13、te, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.3 National Colour System (NCS) AB, Box 49022 100 28, Stockholm, Sweden, .Available from Swedish Standards Instit
14、ute, SIS Frlag AB, SE-11880 Stockholm, Sweden, www.sis.se.4 Available from U.S. National Committee of the CIE (International Commission on Illumination) or CIE Webshop http:/ document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes h
15、ave been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official d
16、ocument.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States12.4 ASTM Adjuncts:Spreadsheet for NCS Notations and CIE Coordinates53. Terminology3.1 Terms and definitions in Terminology E284 are applicable to this practice.3.2 Definitions of
17、 Terms Specific to This Standard:3.2.1 elementary color, none of the six color percepts each of which can be described only by reference to itself.3.2.1.1 DiscussionThe elementary colors, which are designated with uppercase letters, are as follows: white (W), black (S), yellow (Y), red (R), blue(B),
18、 green (G). All other colors can be described in terms of their resemblance to these six. White and black are achromaticelementary colors. Yellow, red, blue and green are chromatic elementary colors.3.2.2 elementary attribute, nthe degree of resemblance of a color to an elementary color.3.2.2.1 Disc
19、ussionThe elementary attributes, which are designated by italic lowercase letters, are: whiteness (w), blackness (s), yellowness (y),redness (r), blueness (b), and greenness (g).Whiteness and blackness are achromatic elementary attributes. Yellowness, redness,blueness and greenness are chromatic ele
20、mentary attributes. All are perceptual quantities, which are expressed by a numberbetween 0 and 100. For any arbitrary color the following apply:(a) the color cannot simultaneously possess yellowness and blueness,(b) the color cannot simultaneously possess redness and greenness,(c) the sum of its el
21、ementary attributes is 100.It follows that a color can have at most four elementary attributes in one of the following combinations:w1s1c11c25 100 (1)where c1 and c2 are adjoining elementary chromatic colors, such as y and r,r and b,b and g, or g and y.3.2.3 full chromatic color, na color that lacks
22、 the elementary attributes of whiteness and blackness.3.2.3.1 DiscussionA full chromatic color, regardless of hue, is designated by an uppercase letter, C. The four chromatic elementary colors Y, R, Band G are also full chromatic colors.3.2.4 NCS chromaticness, nthe degree of resemblance of a color
23、to the full chromatic color of the same hue.3.2.4.1 DiscussionNCS chromaticness is a perceptual quantity derived from the chromatic elementary attributes.The NCS chromaticness is expressedby a number between 0 and 100 for the sum of the (at most two) chromatic elementary attributes, and it is design
24、ated by an italiclowercase c. It follows that:c 5 c11c2 (2)where c1 and c2 are adjoining elementary chromatic colors, such as y and r,r and b,b and g, or g and y.Eq 1 and Eq 2 can then be written:w1s1c 5 100 (3)For achromatic (pure gray) colors including the elementary colors white and black, c = 0
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