YD/T 776-1996 信封色度检测仪
时间:2024-04-29 01:15:39 来源: 标准资料网 作者:标准资料网 阅读:8529
基本信息
标准名称: | 信封色度检测仪 |
中标分类: |
通信、广播 >>
邮政 >>
邮政机械设备 |
发布日期: | 1996-01-23 |
实施日期: | 1996-01-23 |
首发日期: | 1900-01-01 |
作废日期: | 1900-01-01 |
起草单位: | 邮电部第三研究所 |
出版社: | 中国标准出版社 |
出版日期: | 2004-04-18 |
页数: | 7页 |
书号: | 155066.2-10972 |
适用范围
范围:本标准规定了信封色度检测仪的技术要求、试验方法、检验规则和标志、包、运输、贮存。适用于测定信封反射率和邮政编码红框PCS值的专用信封检测的仪器。
前言
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引用标准
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所属分类: 通信 广播 邮政 邮政机械设备
【英文标准名称】:StandardPracticeforCalculationofColorTolerancesandColorDifferencesfromInstrumentallyMeasuredColorCoordinates
【原文标准名称】:仪器测量颜色坐标中允许色差和色差的计算用标准实施规程
【标准号】:ASTMD2244-2011
【标准状态】:现行
【国别】:
【发布日期】:2011
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:E12.04
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:颜色;色差;色差度量;色空间;颜色容差
【英文主题词】:color;colordifference;colormetrics;colorspaces;colortolerances
【摘要】:TheoriginalCIEcolorscalesbasedontristimulusvaluesX,Y,Zandchromaticitycoordinatesx,yarenotuniformvisually.EachsubsequentcolorscalebasedonCIEvalueshashadweightingfactorsappliedtoprovidesomedegreeofuniformitysothatcolordifferencesinvariousregionsofcolorspacewillbemorenearlycomparable.Ontheotherhand,colordifferencesobtainedforthesamespecimensevaluatedindifferentcolor-scalesystemsarenotlikelytobeidentical.Toavoidconfusion,colordifferencesamongspecimensortheassociatedtolerancesshouldbecomparedonlywhentheyareobtainedforthesamecolor-scalesystem.Thereisnosimplefactorthatcanbeusedtoconvertaccuratelycolordifferencesorcolortolerancesinonesystemtodifferenceortoleranceunitsinanothersystemforallcolorsofspecimens.Foruniformityofpractice,theCIErecommendedin1976theuseoftwocolormetrics.TheCIELABmetric,withitsassociatedcolor-differenceequation,hasfoundwideacceptanceinthecoatings,plastics,textilesandrelatedindustries.WhiletheCIELABequationhasnotcompletelyreplacedtheuseofHunterLH,aH,bH,thisolderscaleisnolongerrecommendedforotherthanlegacyusers,andisthereforeincludedinanAppendixforhistoricalpurposes.TheCIELABcolor-differenceequationisalsonotrecommendedinthispracticeforuseindescribingsmallandmoderatecolordifferences(differenceswithmagnitudelessthan5.0x0394;E*abunits).Thefourmorerecentlydefinedequations,documentedhere,arehighlyrecommendedforusewithcolor-differencesintherangeof0.0to5.0x0394;E*abunits.Usersofcolortoleranceequationshavefoundthat,ineachsystem,summationofthree,vectorcolor-differencecomponentsintoasinglescalarvalueisveryusefulfordeterminingwhetheraspecimencoloriswithinaspecifiedtolerancefromastandard.However,forcontrolofcolorinproduction,itmaybenecessarytoknownotonlythemagnitudeofthedeparturefromstandardbutalsothedirectionofthisdeparture.Itispossibletoincludeinformationonthedirectionofasmallcolordifferencebylistingthethreeinstrumentallydeterminedcomponentsofthecolordifference.Selectionofcolortolerancesbasedoninstrumentalvaluesshouldbecarefullycorrelatedwithavisualappraisaloftheacceptabilityofdifferencesinhue,lightness,andsaturationobtainedbyusingPracticeD1729.Thethreetoleranceequationsgivenherehavebeentestedextensivelyagainstsuchdatafortextilesandplasticsandhavebeenshowntoagreewiththevisualevaluationstowithintheexperimentaluncertaintyofthevisualjudgments.Thatimpliesthattheequationsthemselvesmisclassifyacolordifferencewithafrequencynogreaterthanthatofthemostexperiencedvisualcolormatcher.Whilecolordifferenceequationsandcolortoleranceequationsareroutinelyappliedtoawiderangeofilluminants,theyhavebeenderivedoroptimized,orboth,foruseunderdaylightillumination.Goodcorrelationwiththevisualjudgmentsmaynotbeobtainedwhenthecalculationsaremadewithotherilluminants.Useofatoleranceequationforotherthandaylightconditionswillrequirevisualconfirmationofthelevelofmetamerisminaccordancewith........
【中国标准分类号】:
【国际标准分类号】:17_180_20
【页数】:12P.;A4
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【英文标准名称】:Hydraulicfluidpower.Gasloadedaccumulators.Dimensionsofgasports
【原文标准名称】:流体动力用液压气动蓄能器.煤气喷气口的尺寸
【标准号】:BS7201Pt.2-1995
【标准状态】:作废
【国别】:
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【发布单位】:英国标准学会(GB-BSI)
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【标准类型】:()
【标准水平】:()
【中文主题词】:
【英文主题词】:
【摘要】:
【中国标准分类号】:
【国际标准分类号】:
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