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首页 rgb与cmyk颜色de区别(The difference between RGB and CM…

rgb与cmyk颜色de区别(The difference between RGB and CMYK color de).doc

rgb与cmyk颜色de区别(The difference b…

zheng英慧
2017-10-23 0人阅读 举报 0 0 暂无简介

简介:本文档为《rgb与cmyk颜色de区别(The difference between RGB and CMYK color de)doc》,可适用于社会民生领域

rgb与cmyk颜色de区别(ThedifferencebetweenRGBandCMYKcolorde)rgb与cmyk颜色de区别(ThedifferencebetweenRGBandCMYKcolorde)RGBcolorsandCMYKcolorsaretwodifferentcolorpatternsTheRGBcolorpatternisthemostbasiccolorpattern,sotheRGBcolorpatternisanimportantpatternAslongastheimagedisplayedonthecomputerscreen,itmustbeinRGBmodeBecausethephysicalstructureofthedisplayistofollowtheRGBCMYK,alsocalledprintcolorpatterns,isprintedasthenamesuggestsIt'sabigdifferencecomparedtoRGB:TheRGBmodeisaluminouscolorpattern,andyoucanstillseethecontentsonascreeninadarkroomCMYKisareflectivecolorpatternHowdowereadthecontentofthenewspaperSunlightorlightshinesonthenewspaper,andthenreflectsintooureyestoseethecontentItrequiresanexternallightsource,andyoucannotreadthenewspaperifyouareinthedarkroomAslongastheimagedisplayedonthescreenisRGBmodeperformanceTheimagethatisseenontheprintedmaterialistheCMYKpatternForexample,periodicals,magazines,newspapers,postersandsoonareprintedout,andthatistheCMYKmodelSimilartoRGB,CMYisthefirstletteroftheprintinginks:cyan,Cyan,magenta,Magenta,yellow,YellowTheKtakesthelastletteroftheblack,soitdoesnottaketheinitiallettertoavoidconfusionwithBlueIntheory,it'senoughtojustneedCMYthreeinks,andthethreeofthemshouldbeblacktogetherButbecausethecurrentmanufacturingprocesscannotproducehighpurityink,theresultofCMYadditionisactuallyadarkredItalsoneedstoaddaspecialblackinkandInPhotoshop,tounderstandthepatternconceptisveryimportant,becausethecolormodedisplayandprintelectronicimagecolormodel(simplecolormodelisamathematicalalgorithmforcolor),apairofelectronicimagesinwhatwaysinthecomputerdisplayorprintoutThecommoncolormodeincludingbitmapmode,graymodel,doubletonemode,HSB(hue,saturation,brightness(RGB)mode,saidthatthered,greenandblue)model,CMYK(cyan,magenta,yellow,saidblack)model,Labmodel,indexcolormode,multichannelmodeandbitanumberofimagemodel,eachmodelisdescribedandtheprincipleandcanreproducethecolordisplaycolorisdifferentInadditiontodeterminingthenumberofcolorsthatcanbedisplayedintheimage,thecolorpatternalsoaffectsthenumberofchannelsandthesizeofthefileThechannelmentionedhereisalsoanimportantconceptinPhotoshop,whereeachPhotoshopimagehasoneormorechannels,eachstoringinformationaboutthecolorelementsintheimageThedefaultnumberofcolorchannelsinanimagedependsonitscolorpatternForexample,CMYKimagehasatleastfourchannelresolutiononbehalfofgreen,yellowandblack,magentainformationInadditiontothesedefaultcolorchannels,additionalchannelscanalsobecalledtheAlphachannelisaddedtotheimage,soastostoreandedittheselectionmask,andcanaddthecolorchannelAnimagesometimeshasasmanyaschannels,bydefault,Bitmapmode,graytone,andindexcolorarestillachannelintheimageRGBandLabimageshavethreechannelstheCMYKimagehasfourchannelsOne,HSBmodeTheHSBmodelisbasedonthehumaneye'sobservationofcolors,inwhichallcolorsarerepresentedbythreecharacteristics,hueorhue,saturation,orbrightnesshue(H)Hueisthecolor,physical,andpsychologicalcharacteristicsassociatedwiththemainwavelengthofthecolorFromtheexperimentitisknownthatthevisiblelightofdifferentwavelengthshasdifferentcolorsManywavelengthsoflightcanbemixedindifferentproportionstoformawidevarietyofcolors,butaslongasthewavelengthcompositioniscertain,thenthecolorisdeterminedNoncolor(black,,gray)doesnotexisthueattributesallcolors(red,orange,yellow,green,green,blue,purple,etc)aretheattributesthatindicatetheappearanceofcolorTheyareallhues,andsometimeshueisalsocalledhuesaturation(S)Saturationreferstotheintensityorpurityofacolor,representingtheproportionofgraycomponentsinthehue,expressedin(solidcolor)brightness(B)Brightnessistherelativedegreeofbrightnessofacolor,usuallymeasuredby(black)(white)Two,RGBmodeRGBmodelisthemixingprincipleofprimarycolorsoflightinnaturebasedonthered(Red),green(Green)andblue(Blue)coloraccordingtofrom(black)to(white)thebrightnessvaluedistributionineachcolor,soastospecifythecolorWhentheprimarycolorsofdifferentbrightnessaremixed,theyproduce**colors,aboutmillionthousandForexample,abrightredmayhaveaRvalueof,aGvalueof,andaBvalueofWhenthebrightnessvaluesoftheprimarycolorsareequal,theyproducegraywhenbrightnessvaluesare,purewhiteisproducedandwhenallbrightnessvaluesare,pureblackisproducedWhenthecolorofthecolorsismixed,thecolorisgenerallyhigherthantheoriginalcolor,sothemethodofgeneratingcolorintheRGBmodeisalsocalled"colorpluscolor"Three,CMYKmodeTheCMYKcolormodeisaprintmodeFouroftheselettersrefertocyan(Cyan),magenta(Magenta),yellow(Yellow)andblack(Black),whichrepresentfourcolorsofinkinprintingCMYKmodeisnotwhattheessentialdifferencewiththeRGBmodel,theprincipleofonlythedifferentcolors,colormixingcoloremittedfromthelightsourceintheRGBmode,andintheCMYKmodebythelighttohavedifferentproportionsofC,M,Y,Kinkonpaper,partofthespectrumisabsorbedbyreflectionlightcoloreyeBecauseofC,M,Y,Kinthemixedcolor,withtheincreaseofC,M,Y,Kfourcomponentsofthereflectedlighttothehumaneyewillbelessandless,thebrightnessofthelightwillbemoreandmorelow,allCMYKcolormodeisalsocalledsubtractivecolorFour,LabmodeTheprototypeoftheLabmodelwasdefinedbytheCIEsocietyinasameasureofcolorItwasredefinedandnamedCIELabinThispatternsolvesthedifferenceincolorsupportcausedbydifferentdisplaysandprintdevices,thatis,itdoesnotrelyonthedeviceTheLabcolorisrepresentedbyaluminancecomponentLandtwocolorcomponentsaandBTherangeofLis,andtheacomponentrepresentsthespectralchangefromgreentored,whiletheBcomponentrepresentsthespectralchangefrombluetoyellow,andtherangesofaandBareTheLabpatterncontainsthewidestrangeofcolorsthatcancontainallthecolorsintheRGBandCMYKmodesTheCMYKmodelcontainsthefewestcolors,someonthescreen,butnottheprintedcolorsontheprintedmatterFive,othercolorpatternsInadditiontothebasicRGBmodel,CMYKmodelandLabmodel,Photoshopsupport(orprocessing)othercolormodels,thesemodelsincludebitmapmode,graymodel,doubletonemode,indexedcolormodeandmultichannelmodeAndthesecolorpatternshavespecialusesForexample,grayscaleimagesonlyhavegrayvalueswithoutcolorinformationindexcolorpatterns,althoughtheycanusecolors,canbeusedinarelativelysmallamountofcolorrelativetoRGBmodeandCMYKmodeHerearesomeofthesecolorpatternsbitmap(Bitmap)modeBitmappatternsrepresentpixelsinanimageintwocolors(blackandwhite)BitmapimagesarealsocalledblackandwhiteimagesBecauseofitsdepthof,alsoknownasanimageSincebitmappatternsrepresentonlythepixelsoftheimageinblackandwhite,alargeamountofdetailislostwhenconvertingtheimagetobitmapmode,soPhotoshopprovidesseveralalgorithmstosimulatelostdetailsintheimageInthesamewidth,height,andresolution,bitmapimageshavethesmallestsize,approximatelyofgrayscalemodeandbelowofRGBmodegrayscale(Grayscale)modeGrayscalemodecanuseuptograyleveltoshowtheimage,sothatthetransitionoftheimageismoresmoothanddelicateEachpixelofthegrayscaleimagehasabrightnessvaluebetween(black)to(white)Grayvaluescanalsoberepresentedbythepercentageofblackinkcovered(equalswhiteandisblack)Imagesproducedbyblackfoldorgrayscalescannersareoftenshowningrayscaletone(Duotone)modeTwotonemodeusingcolorinktocreateatwotone(colors),threecolor(colors)andfourcolor(colors)themixedlevelsofanimageInconvertingagrayscaleimageintoatwotonemode,thetonecanbeeditedtoproduceaspecialeffectTheuseofdualtonemodeisthemainuseoflesscolorasmanyshades,itisveryimportanttoreducethecostofprinting,becausewhenprinting,eachadditionalcolorsareinneedofgreatercostindexcolor(IndexedColor)modeIndexcolorpatternsarecommonlyusedinonlineandanimatedimagesWhenthecolorimageisconvertedtoanindexedcolor,theimagecontainsnearlycolorsTheindexcolorimagecontainsacolortableIfthecolorintheoriginalimagecannotberepresentedbycolors,PhotoshopwillselecttheclosestcolorsfromtheavailablecolorstosimulatethecolorssothatthesizeoftheimagefilecanbereducedUsedtostorethecolorsinanimageandtoestablishacolorindexforthosecolorsThecolortablecanbedefinedduringconversionormodifiedaftertheclaimedindeximagemultichannel(Multichannel)modeMultichannelmodeisveryusefulforimageswithspecialprintingrequirementsForexample,ifonlyoneortwoortwoorthreecolorsareusedintheimage,multichannelmodecanreducetheprintingcostandguaranteethecorrectoutputoftheimagecolorbitbitchannelmodeIngrayscaleRGBorCMYKmode,bitchannelscanbeusedinsteadofthedefaultbitchannelAccordingtothedefault,channelcontainslevels,ifincreasedto,thenumberoflevelsofeachchannelis,itcangetmorecolordetailPhotoshopcanrecognizeandinputimagesofbitchannels,buttherearesomanyrestrictionsonthisimagethatnoneofthefilterscanbeused,andtheotherbitchannelscannotbeprintedSix,colormodeconversionInordertooutputimagescorrectlyondifferentoccasions,itissometimesnecessarytoconvertanimagefromonemodetoanotherPhotoshopconvertsthedesiredcolorpatternbyexecutingthecommandsintheImageMode(imagemode)submenuTheconversionofthiscolorpatternsometimeschangesthecolorvaluesintheimagepermanentlyForexample,whenconvertingRGBmodeimagestoCMYKmodeimages,theRGBcolorvaluesbeyondtheCMYKgamutareadjustedoutsidetheCMYKgamut,thusnarrowingthecolorrangeSincesomecolorslosepartofthecolorinformationafterconversion,itisbettertosaveabackupfilebeforeconvertingsothattheimagecanberestoredwhennecessaryconvertsthecolorimagetograyscalemodeWhenconvertingacolorimagetoagrayscalepattern,Photoshopwillthrowoutallthecolorinformationintheoriginalimage,leavingonlythegraylevelofthepixelGrayscalemodecanbeusedastheintermediarymodebetweenbitmapmodeandcolormodeconvertsothermodesofimagestobitmapmodeConvertingtheimagetobitmapmodereducestheimagecolortotwo,thusgreatlysimplifyingthecolorinformationintheimageandreducingthefilesizeToconvertanimagetobitmapmode,youmustfirstconvertittograyscalemodeThisremovesthehueandsaturationinformationofpixels,leavingonlythebrightnessvaluesHowever,sinceveryfeweditoptionscanbeusedinbitmapmodeimages,itisbettertoeditimagesingrayscalemodeandthenconvertthemIngrayscalemode,theeditedbitmapmodeimagemaylookdifferentwhenconvertedbacktobitmapmodeForexample,inbitmapmode,blackpixels,whichareeditedingrayscalemode,maybegrayIfthepixelisbrightenough,whenconvertedbacktobitmapmode,itwillbecomewhiteconvertsotherpatternsintoindexpatternsWhenconvertingacolorimagetoanindexcolor,manyofthecolorsintheimageareremoved,whileonlyofthemarepreserved,thestandardcolorssupportedbymanymultimediaanimationapplicationsandwebpagesOnlygrayscaleandRGBpatternscanbeconvertedtoindexedcolorpatternsSincethegrayscalemodelitselfiscomposedoflevelsofgray,Therefore,thereisnosignificantdifferencebetweenthecolorandtheimagesizeafterindexingtothecolorHowever,whentheRGBmodelisconvertedtoanindexedcolorpattern,thesizeoftheimagewillbesignificantlyreducedandthevisualqualityoftheimagewillbeimpairedconvertsRGBmodeimagestoCMYKmodeIfyouconvertRGBmodeimagesintoCMYKmode,thecolorsintheimagewillbeseparated,andthegamutofcolorswillbelimitedTherefore,iftheimageisinRGBmode,itisbettertoedititinRGBmodeandthenconvertitintoaCMYKimageusingLabmodeformodeconversionInthecolorpatternthatPhotoshopcanuse,theLabpatternhasthewidestgamut,includingallthecolorsintheRGBandCMYKgamutTherefore,convertingtoLabmodedoesnotcauseanylossofcolorPhotoshopusestheLabmodeasaninternalconversionmodetoaccomplishconversionsbetweendifferentcolorpatternsForexample,whenconvertingRGBmodeimagestoCMYKmode,thecomputerfirstconvertstheRGBmodetoLabmode,andthenconvertstheLabmodeimagetotheCMYKmodeimageconvertsotherpatternsintomultimodalmodesAmultimodalmodecanbeobtainedbyconvertingcolorpatternsandremovingthecolorchannelsoftheoriginalimageCMYKimageswillbeconvertedtomultichannelmodecanbecreatedbycyan,magenta,yellowandblackcolor(thecolorisspecialpremixedink,usedtoreplaceorsupplementthefourcolorinkprintingspotcolorchannelisaspecialcolorchannelToaddapreviewforspotcolorimage)ConstructedimageImageRGBimageswillbeconvertedtomultichannelmodetocreateagreen,magentaandyellowcolorRemovingachannelfromanRGB,CMYK,orLabimageautomaticallyconvertstheimagetoamultimodalmodeTheoriginalchannelisconvertedtospotcolorchannel

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rgb与cmyk颜色de区别(The difference between RGB and CMYK color de)

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