Peruskatsaus
Colordesktoppublishingsystem,alsoknownasDTP,istheabbreviationofDeskTopPublishingbecauseitissmallandcanbeplacedNamedonthedesktop.
Thecolordesktoppublishingsystemisanewtypeofpre-pressprocessingequipmentintroducedinthe1990s.Itisacombinationofdesktopcolorseparationanddesktopelectronicpublishing.Itsadventfundamentallysolvesthedefectsofelectroniccolorseparationmachine'sweakabilitytoprocesstextandcannotmakenegativeorscientificnegativeswithintegratedgraphicsandtext.
Thecolordesktoppublishingsystemisdividedintothreeparts:input,processingandoutputfromtheoverallstructure.
Syöttölaite
Thebasicfunctionoftheinputdeviceistoscan,separatecolorsandenterthesystem.Inadditiontotextinputandthecomputertypesettingsystemisthesame,imageinputcanuseavarietyofequipment,suchas:scanners,electroniccolorseparationmachines,cameras,plottersandsatellitegroundreceivingstations.Scannersaremorecommonlyused.
Therearetwotypesofscanners:platformtypeandrollertype.Thescannerusedincolordesktoppublishingsystemshouldhaveinputresolution,colornumberandscandensityrangesuitableforprintingrequirements.
(1)Syötteen resoluutio
referstothenumberofpointssampledperinch,expressedindpi.Dpiandthenumberofdotlineslpihavethefollowingrelationship:
dpi(syöttöresoluutio)=pisterivien määrä × zoomausnopeus × kerroin
Thecoefficientisgenerally1to2.Asthemagnificationincreases,therequiredresolutionincreases.Themagnificationofthereflectivemanuscriptissmall,calculatedat5times,1500dpiisenough.Theformatofthetransmissivemanuscriptissmall,anditiscalculatedat10times,and3000dpiwillwork.Somescannershavearesolutionof6000-8000dpi.Theactualresolutionuseddependsontheoutputresolutionandthezoomratiooftheimage.
(2)Värinumerot ja skannaustiheysalue
Värinumerot viittaavat siihen, kuinka monta binaarinumeroatietyt värit esitetään,kuten 8-bittinen, 16-bittinen, 24-bittinen, 36-bittinen jne..Skannaustiheysalue viittaa tiheyseroon vaaleimpien ja tummimpien osien välillä.Yleensäsuurimpiskannaustiheyslukualue on0.
Inaddition,thescannerisrequiredtoprovideastandarduniversaldataformat,accuratelyandreliablyacceptthecontroloftheworkstation,andhavethefunctionofautomaticenvironmentalcorrection,whichcancompensatefortheinterferenceoflightfromtheoutside,andatthesametime,ensurethatthescannercanreachUnderthepremiseofthemaintechnicalindicators,thefasterthescanningspeed,thebetter.
Käsittelylaitteet
Käsittelylaitteetiscollectivelyreferredtoasgraphicworkstation.Thebasicfunctionistoprocessthemanuscriptdatathatentersthesystem,suchas:colorcorrection,revision,impositionandcreativeproduction,plustext,symbols,etc.,toformacompletepicture-textpage,andthensendittotheoutputdevice.
ThecomputeryouareusinghasaMaccamera(MAC)?PCsandworkstations,etc.Becausethehardwareequipmentandsoftwareavailablefordesktopsystemsareextremelyrich,whenselectinghardwareandsoftwaresuitableforprintingrequirementstoformasystem,severalissuessuchasprocessingspeed,processingcapacity,systemnetwork,andChineseenvironmentshouldbeconsidered.
(1) Käsittelynopeus
Imageprocessingrequirespoint-by-pointprocessingofthepointsintheimage.Theamountofdataisverylargeandrequiresahighspeed.Ahigher-grademicrocomputershouldbeused.Orworkstation.
(2)Jalostuskapasiteetti
Asimageprocessingrequireshigherandhigherinputresolutionandoutputresolution,thecapacityoftheworkstationtoprocessdataisincreasing.Atthesametime,itisalsorequiredtostorealargenumberofready-madeimagelibrariesandfontlibraries.
(3)Järjestelmäverkko
Iftheworkofthecolordesktoppublishingsystemisnetworked,multiplecomputerswillworktogethertocompleteatask,andpeoplewillenjoyexpensivescanningandrecordingequipment.Therefore,itisnecessarytoselectareasonablesystemnetwork,networkserver,andfileservertosupportit.
(4)Kiinan ympäristö
Thedevelopmentofvariousforeignapplicationsoftwareisveryrapid,itisimpossibletoChineseizethenewapplicationsoftwareonebyoneandthenuseitinChina,whichrequiresgoodworkstationsWithitsChineseenvironmentandgoodcompatibilityandopenperformance,itcandirectlytransplantthenewlyopenedWesternlanguagesoftwaretothesystem'sChineseenvironmentwithoutanyproblems.
Lähtölaite
Theoutputdeviceisthedevicethatthecolordesktoppublishingsystemgeneratesthefinalproduct.Itismainlycomposedofahigh-precisionlaserimagesetter(alsocalledagraphicrecorder)andRIP(RasterImageProcessor).Thelaserimagesetterusesalasertogatherthebeamintoalightspot,hitthephotosensitivematerialtomakeitsensitive,anddevelopitintoablackandwhitenegative.RIPacceptsthelayoutofPostScriptlanguage,convertsitintoarasterimage,andthenoutputsitfromtheimagesetter.(PostScriptisapagedescriptionlanguagedevelopedbyAdobe.Itisnowacceptedbymanypeopleandhasbecomeastandard.)RIPcanbeimplementedbyhardwareorsoftware.ThehardwareRIPiscomposedofahigh-performancecomputerplusadedicatedchip.ThesoftwareRIPiscomposedofahigh-performancegeneral-purposemicrocomputerpluscorrespondingsoftware.Inordertomeettherequirementsofimageprocessingforprinting,theoutputresolution,outputrepeataccuracy,outputscreenstructure,outputspeedandotherperformanceindicatorsofthelaserimagesetterandRIPmustbeconsidered.
(1)Tulostusresoluutio
Tekstin resoluutio on yleensä 700–900 dpi, tarkkuus on 60 riviä/cmpiste, resoluutio vaatii 2400 dpi, 70 riviä/cmpistettä 3200 dpi.
(2)Tulosten toistettavuus
Forhigh-endexquisiteprints,themaximumallowableerrorofrepeatabilityis5μm.Forgeneralprintedmattersuchasmanuals,booksandperiodicals,therepeataccuracyisallowedtobe20-25μm.Forlow-gradeprintedmattersuchascolornewspapers,theallowableerrorofrepeatabilityis25-50μm.
(3) OutputScreeningStructure
Itcanoutputdifferentdotlinesanddotshapes.Inordertoensurethatthecolorimageiscopiedwithoutobvioustortoiseordensityfluctuations,theoutputdeviceisrequiredtoproducedotswithgoodprintingperformance.
(4) Lähtönopeus
TheoutputspeeddependsontheperformanceofRIPandgraphicrecorder.ThehardwareRIPspeedisfast,andthesoftwareRIPspeedisslow.Underthepremiseofoutputtingthesamequalitycolorseparationfilm,thefasterthebetter.
Inaddition,theoutputdeviceshouldalsohaveastandardinterfaceandtheabilitytooutputChinesecharacters,andtheoutputformatcanmeettherequirementsofprinting.
Theoutputdevicesofthecolordesktoppublishingsystemalsoincludevariouscolorprinterssuchaslaserprinters,inkjetprinters,thermalprinters,andvariousmultimediacarriers(slideshowmaker,CD-ROM,videorecorder,etc.).
Huippuluokan verkkotoiminta
Thecolordesktoppublishingsystemisconnectedwithvarioustypesofexistingelectroniccolorseparationmachines,calledhigh-endnetworking,whichisanotherwayofworkingfordesktopsystems.
Whenusinghigh-endnetworkingtoobtainhigh-qualitygraphicnegatives,theelectroniccolorseparationmachineinterfacemustsolvetwokeyproblems.First,thespeedissue.Sincetheelectroniccolorseparationmachinecannotbecontrolledwhenitisinandinthestate,theinterfaceandtheinterfaceworkstationmustbefastenoughtoreceivethescanningdataoftheelectroniccolorseparationmachineandsenddatatotheelectroniccolorseparationmachineatthesametime.Second,thewaytooutputnegativesinoneimageandtext.Ifthedotgeneratoroftheelectroniccolorseparationmachineisusedtogeneratedots,onlyahigh-resolutioninterfaceisaddedtojointlycompletetheoutputoftheimageandtext.Ifyoudonotusethedotgeneratoroftheelectroniccolorseparationmachinetogeneratedots,andonlytreattherecordingpartoftheelectroniccolorseparationmachineasanimagetypesettingmachine,youneedtoaddaRIPtoprocessthedotsandtext,andthedesktopsystemusestheelectroniccolorseparationmachinethroughRIP.
Huippuluokan verkkotoimintahasformedafull-pageimpositionsystemwithageneral-purposecomputerasthecore.Itnotonlytakesadvantageofthehighinputresolutionoftheelectroniccolorseparationmachineandgoodimageprocessingquality,butalsointegratestheadvantagesofthedesktopsystemthatcanprocessgraphicsandtextatthesametime.Itopensupanexcellentwayformanufacturerswithelectroniccolorseparationmachinestoimprovetheabilityandefficiencyofcolorplatemaking.