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13
RegisteringRasterImages
Rasterimagescanprovidecontexttoyourmapsbygivingthemdetailand
definition.Thischapterreviewsthedetailsofregisteringandworkingwithraster
imagefiles.
Inthissection:
• WorkingwithRasterImages . . . . . . . . . . . . . . . . . . . . . .352
• OpeningaRasterImage . . . . . . . . . . . . . . . . . . . . . . . . . .354
• Printing/ExportingTranslucentRasterImages . . . . . . .359
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WorkingwithRasterImages
Thereareanumberofwaysyoucanobtainrasterimagefiles.Ifyouhaveascannerandscanner
software,youcanusethescannertocreaterasterimagefiles.MapInfoProfessionalcanreadanddisplay
therasterimagefilescreatedwiththescannersoftware.
Somegraphicssoftwarepackagesletyousaveorexportimagesintorasterfileformats,suchasTIFF
(TaggedImageFileFormat).SoifyoucancreateaTIFFfilewithyourdraworpaintpackage,youcan
displayitinMapInfoProfessional.
YoucanalsopurchaserasterimagesfromMapInfoProfessionalorothercommercialvendors.Some
datavendorsalsoofferscanningservices.
DeterminingMapCoordinates
Whenregisteringyourrasterimage,youneedtoknowthemapcoordinatesthatcorrespondtoyour
image.Ifyourrastermapimageshowsagraticule(agridoflongitude/latitudelines),youcandetermine
mapcoordinatesbynotingthelongitude/latitudelabelsalongthegraticule.
Ifyourmapdoesnotshowagraticule,youmaybeabletodeterminemapcoordinatesbylocating
prominentmapfeatures,forexample,theNorthwestcornerofaregion,andthenusinganotherMapInfo
Professionaltableasareferencetodeterminethecoordinatesofthoseprominentfeatures.
Foradiscussionofthisprocess,seeChoosingControlPointsfromanExistingMapintheHelpSystem.
AnIntroductiontoRasterImageRegistration
WhatIsaRasterImage?
Arasterimageisatypeofcomputerizedimagethatconsistsofrowafterrowoftinydots(pixels).Ifyou
haveascannerandscannersoftware,youcancreatearasterimagebyscanningapapermap.After
youscanamapimageandstoretheimageinafile,youcandisplaythefileusingMapInfoProfessional.
Therearemanydifferentrasterimagefileformats.MapInfoProfessionalcanreadthefollowingtypes
ofrasterimagefiles:JPEG,GIF,TIFF,PCX,BMP,TGA(Targa),andBIL(SPOTsatellite).
WhatDoesItMeanToRegisteraRasterImage?
Whenyouregisterarastermapimage,youentermapcoordinates(e.g.longitude/latitudedegrees),and
youindicatewhichlocationsontherasterimagecorrespondtothosecoordinates.Youmustregister
eachrasterimagebeforedisplayingtheimageinMapInfoProfessional,sothatMapInfoProfessional
canperformgeographiccalculations,suchasdistanceandareacalculations,whendisplayingtheraster
map.
ThefirsttimeyouopenarasterimagefilewithinMapInfoProfessional,MapInfoProfessionaldisplays
theRegisterRasterImagedialogbox.Bycompletingthisdialogbox,youtellMapInfoProfessionalhow
toregistertherasterimageanddeterminethecoordinatesystemfortheimage.MapInfoProfessional
storestherasterimage'sregistrationinformationinatablefileforfuturere-use.Thenexttimeyourun
MapInfoProfessional,youcanre-opentherastertablewithoutrepeatingtheregistrationprocess.Thus,
youonlyneedtoregistereachrasterimageonce.
RasterimagefilesprovidedbyMapInfoProfessionalarealreadyregistered.Youdonotneedtoperform
theregistrationprocesswhenyoudisplaythesamplerasterdataincludedwithMapInfoProfessional.
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WorkingwithRasterImages
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UnderstandingRasterImagesinMapInfoProfessional
Usingrasterimagefiles,youcanbringpapermaps,photographs,andothergraphicimagesintoMapInfo
Professional.Forexample,ifyouworkwithpapermaps,youprobablywanttousethosepapermaps
asthefoundationforthemapsyoucreateinMapInfoProfessional.Onceyouscanyourpapermapinto
arasterimagefile,youthencandisplayitinaMapwindow.
UsingRasterImagesasaBackdropforMapInfoProfessionalMaps
Usingarasterimageasthebaselayerofyourmapgivesyouadetailedbackdropforyourothermap
layers.Youcaneasilychangethesize,scale,orcenterpointofthedisplayedimage.Forexample,if
youwanttoenlargepartoftheimage,usetheZoom-intool.Keepinmind,however,thatasyouincrease
theimage'ssize,thedisplaywillbecomegrainierifyouexceeda1-1pixelratio.Eachpixelintheimage
becomesmoredistinct,causingtheimagetolookmorelikeaseriesofblocksinsteadoftheintended
picture.
UsingRasterImagesasaStand-AloneImage
Youmayhaveasatelliteimageoftopographythatwouldbeimpossibletoduplicateasavectorimage
thatyouwanttouseforapresentation.YoucandisplaytheimageinMapInfoProfessionalandthen
incorporateitintoapagelayout.
MapEditingwithRasterImages
Onceyouhavesuperimposedmaplayersontopofyourrasterimage,youcanusetherasterimageas
areferencewhileyouedityourmaplayers.Theprocessofeditingbasedonascreenimageisknown
asheads-updigitizing.(Tominimizeimagedistortion,onlydigitizefrommapimageswithknownprojections
orrectifiedaerialphotographs.)
PlacingaLogoonaPageLayoutwithRasterImages
MostrasterimagesdisplayedinMapInfoProfessionalareimagesofpapermapsoraerialphotographs,
butalmostanyimagecanbescannedandmadeintoarasterimage.Forexample,withanimagelike
yourcompanylogo,youcanopenanddisplaytherasterfileinMapInfoProfessionalwithoutregistering
itbecausecontrolpointcoordinatesareirrelevant.Youcanthenplaceitinaframeinalayoutwindow
andincorporatethelogointoyourpagelayout.
RasterImageFormatDetails
Therearemanydifferentrasterimagefileformats.MapInfoProfessionalcanreadthefollowingtypes
ofrasterfiles:
• filename.ADF(ArcInfocoverageDataFile)
• filename.ASC(ASCIItextfile)
• filename.BIL(SPOTsatelliteimages)
• filename.BMP(Windowsbitmap)
• filename.*(CADRGformat)
• filename.*(CIBformat)
• filename.ECW(ECW2.0formathandler)
• filename.EMF(EnhancedMetafile)format
• filename.FLT(ImageFilter)
• filename.GEN(ADRGformat)
• filename.GEN(ASRP1.2format)
• filename.GIF(GraphicsInterchangeFormat)
• filename.JP2(JPEG2000format)
• filename.JPG(JPEGformat)
• filename.NTF(NITFformat)
• filename.PCX(ZSoftPaintbrush)
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Chapter13:RegisteringRasterImages
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• filename.PNG(PortableNetworkGraphicsformat)
• filename.PSD(Photoshop3.0)
• filename.SID(MrSIDformat)
• filename.TIF(TaggedImageFileFormat)
• filename.TXT(Text)
• filename.TGA(Targa)
• filename.WMF(WindowsMetafileformat)
Foracompletelist,seetheRasterimagefileformatsMapInfoProfessionalsupportsatMapInfo
ProfessionalDataFileSupport.
MapInfoProfessionalalsosupports:
• MapTileServerrasterimages.Formoreinformation,seeEnhancingMapDatausingaMapping
TileServer.
• AirPhotoUSArasterimagestakenatdifferentelevationsforparticularareasintheUnitedStates.The
AirPhotoUSAmaphandlerallowsMapInfoProfessionaluserstoopenanddisplaytheimagerycontained
inAirPhotoUSAMapfilesasalayer.MapInfoProfessionaltreatstheseimageslikeanyotherraster
file.TheMAPINFOW.PRJfilehasbeenupdatedtoaccommodatetheAirPhotoUSAchanges.
Themaximumsupportedrasterimagevariesbyrasterhandler.
Note:
ARCGridFormatSupport
MapInfoProfessionalusestheArcGridHandlertouseanddisplayofESRIgridfiles.Youwillseethe
fileextensionoptionsintheOpenTabledialogboxwhenyouchoosetheFilesofTypeoptionGrid
Image.ThisallowsyoutoopenbothASCIIandBinaryContinuousandClassifiedgridformatsbutyou
canonlyhillshadetheContinuousgridfiles.ThesetypesofdatafilesareavailablefromtheUSGS
SeamlessDataDistributionSystem.
TheArcGridHandlerdoesnotsupporttheArcGridExportformat(*.e00extension)inMapInfo
Professional.
Note:
• Formoreinformation,seeColorOptionsforRasterImagesintheHelpSystem.
OpeningaRasterImage
Whenyouopenarasterfileyouneedtoregisterittoidentifycoordinatepointreferencesfortheimage.
Usingavectormapasareference,youidentifythecoordinatesofthevectormapandmatchthemwith
equivalentpointsontherasterimage.ThiscoordinateinformationallowsMapInfoProfessionalto
determinetheposition,scaleandrotationoftheimagesothatyoucanoverlayvectordataontopofthe
image.ThecoordinateinformationisstoredinaTABfilecreatedduringtheregistrationprocess.The
TABfileenablesyoutore-opentherasterfileinMapInfoProfessionalformat.
Youusuallyregistertheimagethefirsttimeyouopenit.However,youdonotneedtoregistertheimage
ifyoudonotplantousevectordatawithit,orifitalreadycontainsgeoregistrationinformation.
Rasterimagesusuallyfallintooneofthreecategories:
• Afullyregisteredimage,containingcontrolpointsandaprojection(forexample,GeoTIFFfile).
• Apartiallyregisteredimagecontainingcontrolpoints,butmissingaprojection(forexample,animage
withanassociatedWorldfile).
• Anunregisteredimagemissingcontrolpointsandaprojection.
Oncetheimageisregistered,openingitagainrequiresaslightlydifferentprocedure.Openingboth
unregisteredandregisteredimagesisexplainedinthenextsection.
Formoreinformation,seetheserelatedtopicsintheHelpSystem.
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OpeningaRasterImage
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• OpeningaRegisteredRasterImage
• OpeninganUnregisteredRasterImage
• OpeningaGeoreferencedRasterImage
RegisteringtheCoordinatesofaRasterImage
Beforeyoucanoverlayvectordataontopofarasterimage,youmustfirstregistertherasterimageso
thatMapInfoProfessionalcanpositionitproperlyinaMapwindow.IntheImageRegistrationdialog
box,youcanidentifycontrolpointcoordinatesandspecifytheappropriateprojectionfortherasterimage.
ControlpointsarethecoordinatesyouidentifyontherasterimagethatMapInfoProfessionalcanuse
latertomatchuptootherlayers.Itisveryimportanttoprovideaccuratecontrolpointinformationwhen
registeringarasterimage,soMapInfoProfessionalcandisplayrasterimageswithoutdistortingorrotating
them.Later,whenyouoverlayvectordata,MapInfoProfessionaldistortsandrotatesthevectordataso
bothlayerscanlineupproperly.Identifyingsignificantcontrolpointsmakesthismatchupprocesseasier.
Wesuggestyouusehighway/streetintersectionsandprominentlandmarksascontrolpoints,asthey
rarelymove.
Specifyingthecorrectprojectionoftherasterimageisalsoimportantforaccuratedisplay.Imagesthat
donothaveknownprojections,suchasunrectifiedaerialphotographs,arelesssuitableforusewith
vectordata.
TherearetwowaystoregisterarasterimageinMapInfoProfessional.Eachinvolvesspecifyingthemap
coordinatesofcontrolpointsonareferencemapandmatchingthemwithequivalentpointsontheraster
image.Todeterminemapcoordinates,youcan:
• Identifyapoint'scoordinatesfromthepapermap.
• Determinearasterimagescontrolpointcoordinatesonscreenandautomaticallytransfertheinformation
totheImageRegistrationdialogbox.
Ifyouscannedintheimagefromapapermap,themapmostlikelycontainsagraticule(latitude
andlongitudegrid).Youcanchoosethosecoordinatesforprominentfeaturesandenterthem
intheImageRegistrationdialogbox.
Note:
• Forspecificinstructions,seeRegisteringtheCoordinatesofaRasterImageandandChoosingControl
PointsfromanExistingMapintheHelpSystem.
ReprojectingaRasterMap
Fromtimetotime,youwillneedtousearastermapregisteredinoneprojectioninanothermapin
differentprojection.Youcanreprojecttherasterimage,thatis,changethecoordinatesystemandthe
waytherasterimagedisplaystoaccommodatethenewvectormap.Typically,theopenmapdictates
theprojectionofthesuccessivelydisplayedimages.Youcanalsoreprojecttherasterusingtheprojection
ofavectortable.
ReprojectingaRasterbasedonaVectorMap
Ifyouareworkingwithregisteredrasterdatasuchassatelliteandaerialphotoimages,scannedmaps,
grids,seamlesstablesandWMSdata,youmightwanttoreprojectthatrasterdatatoaccommodatea
vectormap.
MapInfoProfessionalperformstherasterreprojectionwhenyouopenaregisteredrasterimageinside
ofanexistingMapwindowwithadifferentprojectionorwhenyouchangetheprojectionofaMapwindow.
Duringtherasterreprojectionprocess,MapInfoProfessionalrecalculatesthepixelvaluesofthesource
imagetomakethemdisplaycorrectlyinthedestinationimage.Inthisresamplingprocess,MapInfo
Professionaltriestorestoreeverypixelvalueoftheimagebasedonthepixelsaroundit.InMapInfo
Professionaltherearetwomethodsforcalculatingthepixelvaluesofthedestinationimage:Cubic
ConvolutionandNearestNeighbor.Theseareindustry-standardtermsusedbyGISprofessionalsall
overtheworld.Thesemethodsaredescribedlaterinthissection.
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Duetothisfeature,thesearetheprecedencerulesforMapwindowprojection.
Bothvectorandrasterlayershave"equalrights",thatis,everynewlayer(withoutregardfortype)is
reprojectedintothecurrentMapwindow'sprojection.Thatis,whichevermapisopenedfirsttakes
precedenceforprojection.
YoucanchangetheprojectionofaMapwindowcontainingamixofrasterandvectorlayersby
settingtheimageprocessingreprojectionpreferencetoAlwaysorOptimized.
Note:
MapInfoProfessionaldoesnotletyouchangetheprojectionorimageprocessing/reprojectionofamap
thatdisplaysrasterimagesfromatileserver,becausethiswouldcreateinaccuraciesinyourmap.The
projectionsystemofthedatamayvarybetweentileservers.Forthisreason,wedonotrecommend
displayingtilesfromdifferenttileserversinthesamemapunlessthetileserversusethesameprojection
system.
Whenyouareworkingwithpaletterasterimages(likeascannedmap),animagemightcontainall256
colors.IfyoudisplaythisimageintheAdjustImageStylesdialogboxandcleartheTransparentcheck
box,thecolor"white"becomestransparent.Ifyoudonotwantthisdisplaybehavior,selecttheTransparent
checkboxandchooseanothertransparentcolor(usingSelectColor).
TransferringVectorMapCoordinatesDirectlytoaRasterMap
Totransferthecoordinatesautomaticallyfromavectormaptoarasterimage,youneedavectormap
ofthesameimage.Then,youdisplaythevectormapsidebysidewiththeImageRegistrationdialog
box,whichshowsapreviewoftherasterimage.Clickaprominentfeatureinthevectormaptodetermine
itscoordinatesandtransferthiscontrolpointtotheImageRegistrationdialogbox.
Totransferavectormap'scoordinatestoarasterimage:
1. OntheFilemenu,clickOpenandRasterImagefileformat.
2. ChoosetherasterimagefileandclickOpen.TheDisplay/Registerdialogboxdisplays.
3. ClickRegister.TheImageRegistrationdialogboxdisplays.Apreviewoftherasterimageappears
inthelowerhalfofthedialogbox.
4. ChoosetheProjectionbuttontospecifytheimage'sprojection.Ifyoudonotsettheprojection,
MapInfoProfessionaldefaultstoLongitude/LatitudeortothedefaulttableprojectionsetintheMap
WindowPreferences.
5. Toaddcontrolpoints,clicktheAddbuttontoaddacontrolpointentrytotheControlPointslist.
6. ClickthePickfromMapbuttonandselectalocationintheMapwindowthatmatchesalocationin
yourrasterimage.MapInfoProfessionalupdatestheMapXandMapYfieldsintheEditControl
Pointdialogboxwiththenewcoordinates.ClickOKtosavethisentryandclosethedialogbox.
WhenthePickfromMapbuttonisdisabled,youcanselectlocationsdirectlyfromtheopen
map.Ifamapisnotopen,youcanselectanothertool(liketheSelecttool)andusethattool
insteadofthePickfromMapfunctionality.
Note:
7. HighlighttheentryintheControlPointslistandclickthematchingcontrolpointlocationintheimage
pane.TheEditControlPointdialogboxdisplaysshowingthecontrolpoint'slocationinpixelsinthe
ImageXandImageYfields.ClickOKtosavetheseentries.
RemembertotypeameaningfuldescriptionofthislocationintheLabelfield.
Note:
8. Repeatthisprocessuntilyouhaveidentifiedthreeorfournon-linearpointsinthepreviewpaneof
theImageRegistrationdialogbox.
9. Afteryouhavedefinedallofthecontrolpoints,clickOKintheImageRegistrationdialogbox.The
rasterimagedisplaysintheMapwindowunderthevectorlayer.
UsetheLayerControlfeaturetopositiontherastermapappropriatelywithyourvectorlayers.
10.Fordetailsonconvertingdegree/minutes/secondscoordinatestodecimaldegrees,seetheHelp
System.
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OpeningaRasterImage
ModifyingControlPointsforRasterImages
Ifyoumustadjustthecoordinatesofacontrolpointbecausetheerrorisunacceptable,highlightthe
pointintheImageRegistrationdialogboxandchooseanotherlocationforitintheMapwindow.To
deletecontrolpoints,clickthepointandchoosetheDeletebutton.
RasterImageDisplayOptions
Youcandisplaymorethanonerasterimageinawindowatatime.Thisislimitedonlybyyourcomputer's
memory.However,ifyouwanttodigitizefromtherasterimage,itisbesttouseonlyoneimageinaMap
window.Thisisbecausetworasterimageswillprobablyhaveslightlydifferentrotations.
Whenusingtworasterimageswithdifferentprojections,keepinmindthatMapInfoProfessionalwilluse
theprojectionoftheimagethatisopenedfirst.Thismeansthatthesecondimageisonlypositioned
approximately.
Color(RasterImage)
OnceyouhavedisplayedarasterimagefileinaMapwindow,youcanmakeadjustmentstothecolors
intheimage.FromtheTablemenu,selecttoRasterandclickAdjustImageStylestochangethe
settingsforthat.tabfile.FromtheMapmenu,selectLayerControl.Double-clickthelayertodisplay
theLayerPropertiesdialogbox.OntheLayerDisplaytab,checktheStyleOverridecheckboxand
clicktheStylebuttontoadjusttherasterstyleonlyinthisMapwindow.
TheAdjustImageStylesdialogboxletsyousetthecontrastandbrightnessoftheimage,set
translucency,displaycolorrasterimagesinshadesofgray,andmakeonecolorintheimagetransparent.
UsingtheAdjustImageStylesdialogboxdoesnotmodifytherasterimagefile;instead,itchangesthe
wayMapInfoProfessionaldisplaystherasterimagefile.Ifyouchangeanimage'sdisplaystyle,MapInfo
Professionalrecordsthenewdisplaystyleinthetablefile(forexamplePARCELS.TAB)orinthe
workspaceforperlayerstyles,butMapInfoProfessionaldoesnotalterthecontentsoftherasterimage
file(PARCELS.GIF)inanyway.
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Ifyouchangeanimage'sdisplaystyleandchooseOK,thenewdisplaystyleisappliedimmediately.It
willalsoaffectallMapwindowsinwhichtheimageisdisplayedifyouselecttheTablemenu,andpoint
toRasterandclickAdjustImageStyles.YoudonotneedtochooseSavetosavethechanges.
StyleOverrideforRasterImages
MapInfoProfessionalprovidestheabilitytochangethedisplaystyleforrasterandgridimagesona
per-layerbasisthroughtheLayerControlwindow.TheStyleOverrideoptionforrasterimagesworks
thesamewayasitdoesforothermaplayers.JustchoosetheMapmenu,andclickLayerControl,and
selectarasterlayerintheLayerlist.ClicktheLayerProperties
button.TheLayerPropertiesdialog
boxdisplays.OntheLayerDisplaytab,selecttheStyleOverridecheckboxandclicktheStylebutton.
TheAdjustImageStylesdialogboxdisplays.Youcanchangeanyoftherasterimagestylesettings.
ZoomLayeringforRasterImages
Zoomlayeringforrasterimagescontrolledfrompreferences(intheOptionsmenu,pointtoPreferences
andclickMapWindowsandselectAutomaticRasterZoomLayering).Tochangethezoomlayering
settingforarasterlayerthatyouarecurrentlyworkingwith,gototheLayerPropertiesdialogbox(from
theMapmenu,selectLayerControl,selectthelayerandclicktheLayerProperties
button)and
toeitheractivateorturnoffzoomlayering.Thesettingisturnedonbydefault.
LimitationsinUsingRasterImages
ManyofMapInfoProfessional'sfeaturescannotbeappliedtorasterimagetables.Asageneralrule,
youcannotuseMapInfoProfessionaltomodifyarasterimagefile.Specificlimitationsofrastertables
include:
• NoDataSavedwithRasterImagesArastertabledoesnothavecolumns,therefore,youcannotattach
textornumericdatadirectlytoarastertable,andyoucannotperformqueries,suchasFind,ona
rastertable.Youcan,however,overlayaconventional(vector-based)MapInfoProfessionaltableon
topoftherasterimage,andattachdatatotheconventionaltable.
• MapProjectionsandReprojectionswithRasterImages:WhenarasterimagefiledisplaysinaMap
window,thefilethatisopenedfirstdeterminestheprojectionofthemap.IftworasterimagesinaMap
windowusedifferentmapprojections,MapInfoProfessionalwillusetheprojectionofthemapthatis
openedfirst.TheMapwindowwillredrawslowlywhenyouoverlayothermaplayersontopofaraster
image.ThemapredrawsslowlybecauseMapInfoProfessionalisre-calculatingmapcoordinatesso
thatthevectormapobjectsconformtotheprojectionoftherasterimage.
AdjustingtheContrastorBrightnessofaRasterImage
TheAdjustImageStylesdialogboxletsyoucontrolhowarasterimageappearsbutdoesnotmodify
therasterimagefile;instead,itchangesthewayMapInfoProfessionaldisplaystherasterimagefile.
Everyrasterimagetableconsistsoftwofiles:arasterimagefile(forexample,PHOTO.GIF),andatable
file(forexample,PHOTO.TAB).Whenyouchangetheimagedisplaystyles,MapInfoProfessionalstores
thenewstylesettingsbymodifyingthetablefile.MapInfoProfessionaldoesnotmodifytherasterimage
fileinanyway.
IfyouchangethedisplayoptionsandchooseOK,MapInfoProfessionalstoresthenewdisplaystyles
immediately;youdonotneedtochooseFile>Save.
• Forinstructions,seeAdjustingtheContrastorBrightnessofaRasterImageintheHelpSystem.
AdjustingtheTranslucencyofaRasterImage
Youcanadjustthepercentagethatlayersshowthroughrasterimages.Atranslucentimageallowsyou
topartiallyseethroughtheimage.Translucentimagescanbelayeredontopofotherlayerssothatthe
lowerlayersarepartiallyvisiblethroughtheimage.
• Forspecificinstructions,seeAdjustingtheTranslucencyofaRasterImageintheHelpSystem.
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Printing/ExportingTranslucentRasterImages
Whenprintingorexportingatranslucentrasterimage,takeadvantageofAdvancedoptions.
Toprintatranslucentrasterimage:
1. Dooneofthefollowing:
• OntheFilemenu,clickPrint
• OntheFilemenu,clickSaveWindowAs
2. ClickAdvancedandchoosefromthefollowingsettingsaccordingtoyourprintingandexporting
requirements.
• Print/ExportBorder-Selecttoincludetheblackrectangleborderwhenexporting.
• InternalHandlingforTransparentVectorFillsandSymbols-SelecttoallowMapInfo
Professionaltoperformspecialhandlingwhenexportingtransparentfillpatternsortransparent
bitmapsymbols.Ifunchecked,theprocessishandledbyWindows.
• UseROPMethodtoDisplayTransparentRaster-Usethisoptiontoprinttherasterimageas
ametafile(EMForWMF).UsingtheROPmethodallowsanyunderlyingdatatoberenderedin
theoriginalform.SelectthischeckboxtoallowtheinternalROP(RasterOverlaybyPixel)to
managethetransparentpixelsfortheraster.
SincetheROPMethodislargelyadisplaymethod,notallprintersandplotterscanuseit.We
recommendthatyouexperimentwiththissettinguntilyougettheresultsyouwantwhenprinting
rasterimages.Thischeckboxisclearedbydefault.
• Print/ExportRasterinTrueColorWhenPossible-Selectthischeckboxtoprintyour24-bit
rasterimagesintruecolor.Makesureyourprintersettingsaregreaterthan256colors.Thischeck
boxisselectedbydefault.
3. WhenyouhavecompletedtheseselectionsandreturnedtothePrintdialogbox,clickOKtobegin
printing.
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