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Important
:CompressionControlandFontEmbedControlaretheonlycontrolsavailablefor
Light
versionof
DocuComPDFDriver.
SecurityControl
:TopasswordprotectyourPDFdocuments,simplyselecta
Control
in
thepull-downmenu;orclickthe
Advance
buttontocreate/edit/delete
Security
controls.
WatermarkControl
:Selecta
Watermark
inthepull-downmenu;orclick
Advance
button
tocreate/edit/deletewatermarkcontrols.
Destination
:SeveralOptionsareavailabletostorethetargetPDFfile.Youmayalsosend
e-mailattachmenttorecipientseithersilentlyorlaunchyoure-mailprogram.
DocumentSettings
:Youcanspecify
OpenOptions
and/or
DocumentInfo
forthe
resultingPDFdocument.
About
Showsproductinformation,purchasingdata,licenseagreement,andsupportinghyperlinks
suchasOnlinePurchase/Register;thisOnlineGuide;OnlineUpdate/Upgrade;andZeon
Contact.
General
Showspagesetup,resolution,scale,andothergeneralsettings.
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PageLayout
PDFDriversupportsmanystandardandcustompagesizesinportraitorlandscapelayout.
ThedefaultsizeisA4--8
½
-by-11inches.PagesizeallowedinaPDFfileis:
1-by-1inch<pagesize<200-by-200inches
.
Check
Portrait
or
Landscape
tochoosepageorientation.
Choosepagesizefromthemenu.If
Customsize
isselected,youcanenterthepage
dimensionsandmarginsdirectly.
Important
:Althoughyoucandefinepagelayoutinthiscontrol,butifauthoringapplication
suchas
MS
Word
,choosesadifferentpagelayout.
DocuComPDFDriver
willhonorapplicationsettingsfirst.See
How
applicationsdecidepagelayout
fordetails
AddStandardPaperSize
Clickthe
Edit
buttonbesidesthe
Standard
papersizeselectionboxto
Define/Store/Edit
yourfrequentlyusedpapersizestoavoidentering
Custom
sizerepeatedly.Youcanenter
any
PaperName
,
Width,Height,Margin
,and
Unit
ofyourchoice.
Limitations
:Duetotheprecisionround-offofconvertingpapersizebetweenDriverand
Windows,addedpaperswithveryclosewidthsandheightsmayconfusetheDriver.Itis
possiblethatDriverfelltomatchapreviousselection.Shouldneverbeabigissueinreal
worldapplications.
Howapplicationdecidespagelayout
Applicationqueriesthesupportedpapersizesofselectedprinter
— “
DocuComPDFDriver
.
Internally,PDFDriversupportsallstandardpapersizesandalsoCustompapersize.
Applicationdeterminesthemostsuitablesizeforthedocument.Then,askprintertouse
thatsize.ForexampleMSWordbehaveslikethis.
Ifapplicationdoesnotchooseapapersize
current(default)papersizeoftheprinteris
used.
Differentapplicationsmayhavedifferentapproaches.
Resolution
Selectaresolution
oneofScreen,Low(150dpi),Medium(300dpi),High(600dpi),or
1200dpi,tobeusedtocreatePDFdocument.Thissettinginfluences
characterspacing
,
line
breaks
,and
imagequality
.Usually,higherresolutionproducesmoreaccurate
layout
possiblywithbiggerfilesize.
Note
:MSExcelmaybreaklinesorevenpagesdifferentlyifyouchoosealowresolution,suchasScreenor
150dpi.
Characterpositioning
Screento300dpi
:Forresolutionbelow300dpi,PDFDrivertrytosetwholelineofcharacters
byevenlydistribute(orsubtract)spacingbetweenthem,withoutconsideringtheexact
positionofeachindividualcharacter
becauseunderlowerresolution,fewerpixelsare
availabletocomputetherequiredprecision.
300dpiandhigher
:Forresolutionabove300dpi(include),PDFDriveraccuratelypositioneach
characterrequestedbyapplicationprogram.
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GraphicsandImage
Windowsusesthe
Resolution
settingtopreparegraphicsorimagedata.Forexample,
WordArtwillgeneratemoredetailed(larger)imagedatatomatchthehigherresolutionyou
picked.
Important:
Lowresolutionisidealforscreenviewing.However,ifhigh-qualitypaper-print,ortheaccuratecontrol
ofcharacterpositionisrequired,youshouldchooseresolutionabove300dpi(include).
Scale
EnterthezoomfactortoenlargeorreducepagecontentsofthetargetPDFfile
valuesare
between1%to1000%--defaultis100%.
ViewresultingPDF
CheckthisoptiontodisplayPDFfileaftercompletion.
OptimizeforOnlyMSOffice(95/98)
ThisoptionisonlyavailableforcertainversionofDocuComPDFDriverfor95/98/ME.Itis
necessarytoimprovethegraphicsqualityofMSOfficeprograms.Wesuggestyoutoselect
thisoptiononlywhenthereareproblemswithyourMSOfficecreatedPDFdocuments.
Important
:Besuretoturnoffthisoptionwhenusingotherapplications.
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PDFSettings
AllPDFcreationrelatedcontrolsettingsaregroupedinthistab:
Compatiblewith
Chooseeither
PDFspec.1.3(4.x)
,
PDFspec.1.4(5.x)
or
PDFspec.1.5(6.x)
tocreate
compatiblePDFfiles.Selectingthelatest
PDF1.5
optionwillcreatePDFspec.1.5
conformingdocumentswithcomparablysmallerfilesize,buttheymaynotberecognizableby
earlierversionofPDFreaderprograms.
Usuallynewspecificationpromiseshigherqualityandsmallerfilesizethanearlier
specification..
Important
:Youmustselectcorrect
Compatible
settingforthetargetPDFviewerprogram.Earlierversionsofthe
PDFreaderprogramCANNOTREADdocumentswhichconformingtonewerversionofspecification.
OptimizeforfastWebviewing
Choosethisoptionto
Linearize
resultPDFfileforfastWebviewing.WithacompatiblePDF
viewerprogram,youcanopen(read)theresultPDFfilepage-at-a-timeremotelywithout
waitingforthedownloadingofthewholedocument.
Note
:Thisfeatureisnotavailablefor
LightEdition
.
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CompressionControl
Clickthe
ControlTitle
toselectapreviouslydefined
Control
fromthepull-downmenu;or
Clickthe
Advance
buttontoshowthe
CompressionControl
dialogbox,whereyoucan
create,edit,ordeletecompressioncontrols.
CompressionSettingsdialog
OnemajorbenefitofusingPDFdocumentsisthegreatlyreducedfilesizecomparingwith
otherformats
akeyfactorforelectronicdistribution.
DocuComPDFcreationtoolsallowyoutocompressimages(bitmaps),text,andgraphics
(lineart)usingsuitable
Compression
and
Re-sampling
methodsofyourchoice.
Sincetheeffectivenessofcompressionishighlydatadependent.Forthebestresult,you
mightwanttotrydifferentcompressionsettingfordifferentkindofdatasources.
Allavailablecontrolsarelistedinthe
ListofControls
box.Clicktoselect(highlight)acontrol
tovieworedititssettings.Use
New
buttontocreateanewcontrol;
Default
toresetcurrent
settings;or
Delete
toremoveselectedcontrol.
Note
:CompressTextandGraphicsusingZIP.
UseAutoSettings
QualityLevel
Werecommendusingthe
AutoSettings
andrelyingonPDFDrivertorecognizetheimage
colordepthandchoosethebestcompressionsettingsformostviewingcases.Version7
comeswithanewsmarterimagecompressionmodule,whichsimplyallowsusertochoosea
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QualityLevel
--tellsthetradeoffbetweenimagequalityandfilesize;andv7willrecognize
imagecolordepthandapplythebestcompressionsettingsforeachimage.
Valid
QualityLevels
arefrom
0
to100.Youcanfreelymovethescaletoexperiencethe
rate.Tipsare:whenclosingto0,imagesdegradetoplaceholder;whilemovingupto100,
therewillbenoqualitylossatall.
Generallyspeaking,Driverwill
Down-Sample
theimagefirst
150dpiforcolorandgray,
300forblack-and-whiteimage;andthenchooseeitherJPEG(Compatiblewith1.3,1.4)or
JPEG2000(Compatiblewith1.5)forcolorandgrayscaleimage.Indexcolorimageswill
alwaysuse
ZIP
compressionmethod.
UseCustomSettings
Ifdesirable,youcanchoosethisoptiontodecidethecompressionmethods,qualitylevel,and
down-samplingbyyourself.
1. Choose(use)compressionmethodsfromthepull-downmenuforeachimagetype(Color,
Gray,andMonochrome).
2. Choose(use)qualitylevelfromthepull-downmenu.
3. Select(use)ordeselect(nottouse)
Re-samplingmethod
foreachimagetype;choose
either
Down-sampling
or
Sub-sampling
fromthepull-downmenu;thenenterthe
minimumresolutionforre-sampling.
4. Click
Default
torestorethe
DefaultControlSettings
.
5. ClickOKtoacceptthesettings.
SeeCompressionBasicsfordetaildiscussionofeachcompressionoption.
CompressionBasics
OnemajorbenefitofusingPDFdocumentsisthegreatlyreducedsizecomparingwithother
formats
animportantconsiderationwhenmovingdocumentsthroughtheInternet.
TextandGraphics
Compresstextandgraphics(lineart)--everythingotherthanbitmapimages,byusingthe
ZIP
compression
methodwithnoinformationloses.Ittakesslightlylongertimetodisplay
compresseddata.
Note
:Charactershapesordrawingsthatarescanned-imagesorcreatedbyusingsomepaintingorphoto
programsareconsideredasimages.
AutoCompression
UseJPEG(PDF1.3,1.4)orJPEG2000(PDF1.5)tocompress8-bitgrayscaleand8-bit,
16-bit,and24-bitcolorimagesthathavecontinuous,smoothcolortones.
UseZIPtocompress8-bitgrayscaleand16-bit,24-bitcolorimagesthathavesharpcolor
changes.
UseZIPtocompress2-bit,4-bitgrayscaleand4-bitcolorimages,and8-bitindexedcolor
images.
Usually,thedefaultsettingof
50%
compressionrategeneratesthebestresults.
Monochromeimage
Severallosslesscompressionoptionsareavailableformonochromeimages
(black-and-white):CCITT,ZIP,andRunLength.Youcanalsousere-samplingforreducing
thesizeofmonochromeimages.
Scannedtextordrawing
Monochromeimagesshouldonlybescannedasmonochromeandnotasgrayscale.Ifyou
savescannedtextasgrayscale
sometimesitissystemdefault,andcompressgrayscale
textwiththeJPEG(lossy)method.Youmayexperienceterriblymuddyresultandmaybe
totallyunreadable.
ZIP(deflate,zlib)method
UseZIPtocompressimage.Thismethodissuitableforscreenshots,dialogboxes,drawings,
orrelativelysmallbitmapimages..
ZIPisdesignedtobeafree,general-purpose,andlegallyunencumbered
thatis,not
coveredbyanypatents.Itisalosslessdata-compressionlibraryforuseonvirtuallyany
computerhardwareandoperatingsystem.TheZIPdataformatisitselfportableacross
platforms.
TheZIPcompressionmethodessentiallyneverexpandsthedata.Thezlib
smemoryfootprint
isalsoindependentoftheinputdataandcanbereduced,ifnecessary,atsomecostin
compression.
LZW
Thiscompressionmethodproducesthebestcompressionresultsforimagesthatcontain
repeatingpatterns.
Note
:DocuComdonotgenerateLZWcompressedPDFdocuments.
CCITT
Thiscompressionmethodisageneral-purposemethodthatproducesgoodcompressionfor
mosttypesofmonochromeimages.
RunLength
Thiscompressionmethodproducesthebestresultsforimagesthatcontainlargeareasof
solidblackorwhite.
JPEG
UseJPEGtocompressimagedata.Jpegissuitableforhighresolutionandlargephoto
images.
JPEGusesatechnique--
DCT
,tocompressorremoveimagedatathatarelesssensitiveto
humaneyes,wherekeeporcompresslessinthehuman-sensitiveimagedataarea.This
methodtriestoreducetheimagesizewiththeleastqualityloss.
Five(5)presetcompressionlevelsofJPEGareavailable
High(Quality),High-medium,
Medium,Medium-Low,Low.Usually,HighorMedium-Highcompressionresultsarevery
muchsimilartotheoriginal.Ordinaryviewercouldnottellthedifferences.However,atLowor
Medium-Lowcompression,theimageusuallybecomesblockyandunsatisfactory.
Important
:Unfortunately,theJPEGcompressionmethodishighlydatadependent.Youmayneedtotestdifferent
settingstofindthebestoptionforyourimagedata.
Startingfrom6.x,weuseIJGcodesforJPEGcompression.Earlierversionsuseourownimplementation.
JPEG2000
ThisisanewmethodavailableforPDFspec.1.5,andisalsosuitableforhighresolutionand
largephotoimages.JPEG2000usesthe
Wavelet
techniquetocompressorremoveimage
datathatarelesssensitivetohumaneyes.Inmostofcases,JPEG2000isbetterthanJPEG
intermsofqualityandsize.
Re-Sampling
Resampleisonewaytoreducetheimagesizebycombiningseveralneighboringpixelsto
makeasinglepixel.Thismethodproducesasmallerbitmapwithlossofdetails.
Re-sampleinwholenumberdivisions
:Imagesarere-sampledinwholenumberdivisionsof
theiroriginalresolutions.Forexample,a300dpiimagecanbere-sampledto150dpi(divide
by2),100dpi(divideby3),75dpi,60dpi,etc.
Resolution
:Youcancontrolre-samplingbyspecifyingaminimumresolution.Imageis
re-sampledasmuchaspossiblebutnotbelowthatminimumresolution.Forexample,givena
minimumresolutionof72dpi,a300dpiimageisdown-sampledto75dpi(divideby4)butnot
60dpi(divideby5),andan180dpiimagecannotbedown-sampledwhenminimumresolution
is100dpi.
Choosethecorrectminimumresolutionforanacceptablefilesizeandimagequality.
Down-sampling
Use
Down-sample
toreducetheresolutionofimagetothespecifieddpisettingbyaveraging
thepixelcolorofasampleareaandreplacingthatareawithapixeloftheaveragedcolor.
Forindexedcolor
:PDFDriverwillre-buildthecolorpalettetomaintainthebestimagequality,
whennecessary.However,rebuildingcolorpaletterequiresmemoryspaceandmoreCPU
time.
Sub-sampling
Use
Sub-sampling
toreducetheresolutionoftheimagetothespecifieddpisettingby
choosingapixelinthecenterofthesampleareaandreplacingthatareawiththepixel
chosen.
Sub-samplingdonotaveragepixelvalues;thereforearefasterthandown-sampling.
FontEmbedControl
PDFDriverallowsyoutoincludefontsinsidePDFdocuments.BysendingPDFdocuments
togetherwithfontswill:
Promisesthesamedocumentlayoutandappearanceatreaderside,
regardlessofwhethernecessaryfontsareinstalledinreaders
computer.
Selectfont
Sub-setting
optiontoincludeonlythosecharactersofafontthatareusedinthe
PDFdocument,toreducedocumentsize.
See
FontBasics
tounderstandcomputerfonts.
Note
:Sub-settingisalwaystruewhenembeddingDBCSfonts.
Stepstoembedfonts
PDFDrivercanembedTrueTypefontsinstalledinWindows
exceptfontsthatdonotallow
embedding.Usually,youshouldembedalldisplay-facefontstoavoidfontsubstitution.
Embedallfonts:
Choose
EmbedAllFonts
checkboxtoembedallfontsusedina
document.The
AlwaysEmbed
listwillbedisabledifthisoptionischecked.
Embedspecificfonts:
Selectspecificfontsthatyouwanttoembed.Inthe
AvailableFont
listclick
>>
toincludeselectedfontinthe
AlwaysEmbed
list.
Embedallbutspecificfonts:
Select
EmbedAllFonts
first,thenselectfontsinthe
AvailableFont
list,andclick
>>
toincludethemin
NeverEmbed
list.
Note
:
Marked
fontsinNeverEmbedlistarefontsthatdonotallowembedding(byfont
vendors);youcannotremovemarkedfontsfromNeverEmbedlist.Otherwiseyoumay
selectafontandclickthe
<<
or
>>
buttonsto
Add
or
Remove
fontsinthe
Always
Embed
or
NeverEmbed
list.
Subsetfonts:
Select(check)thisoptiontoincludeonlythosecharactersofafontthatare
actuallyusedinaPDFdocument.A
threshold
isspecifiedtotelliffont-subsetis
necessary.Ifthepercentageofusedcharacters(comparewithtotalcharactersofthe
particularfont)exceedsthisthreshold,theentirefontisembedded.
Important
:An
AllowEmbedding
flagdefinedinTrueTypespecificationtellswhetherthefontvendorallowsthe
embeddingoftheirfonts.DocuComPDFDriverstrictlyfollowsthisguideline.Youmayswitchtoadifferentfont,if
theembeddingisdefinitelynecessary.
ResettoDefault
Click
Default
torestoreDefaultConversionControls.Bydoingthis,PDFDriverwillcopy
DefaultConversionControls
”–
preparedbytheinstallingprogramoryoursystem
administrator,toyourfolder.AllcurrentConversionControlswillbereplaced.
FontBasics
PDFdocumentssupportmanypopularfontformats
suchasTrueType
,Type1,Type2(CFF,
CID),Type3,andMMfonts,fortherenderingofhighqualitycharactersonscreenorprinter.
Fontnames,characterwidth,andotherfontattributesarekeptinPDFdocuments.If
necessary,youcanalsoembed
FontOutlines
fordisplayingwiththeexactfontsonother
viewer
sscreen.
WindowsFonts
AllversionsofWindowscomewithbasic(13)Latin
TrueType
fonts
.Inadditiontothat,many
applicationsandinternationalversionsofWindowsaddmorefontsintoyoursystem.Windows
TrueType
softwarereadthoseTrueType
fontsandcreatescharactersfordisplayand
printing.
Note
:UseWindowsutilitytocheckforinstalledTrueType
fonts.
FontSubstitution
WhenafontusedinPDFdocumentisnotavailable(notembeddedinPDFfile,andnot
installedinthesystem)--aLook-alikesubstitutefontisused.Thesubstitutefontis
automaticallycreatedbyPDFviewerprogramtomimictheoriginalfonts.PDFviewer
programusescharacterwidthandpositioninformationmaintainedinPDFdocumentto
displaysubstitutefont.Ifcharacterwidthofthesubstituteisdifferentfromtheoriginalfont,
charactersmayoverlaporbreakapart.However,theoriginallinebreaksareretained
Type1
(andMM),Type2(CFF,CID)fonts
TheyarePostScript
outlinefontsusedbyPostScript
printersthatmaycontainhintsto
displaycleartypeinsmallsize.
Type3
font
OutlinefontsthatarecreatedbyusingthePostScript
languageprogram
usedforspecially
designedlogosordecorativefonts.Type3fontsmustalwaysbeembedded.
TrueType
fonts
Widelyusedoutlinefontswithmathematicallydescribedcharactercontour.Youcanenlarge
orreduceTrueType
characterswithsmoothoutlines.
FontSizeandembedding
BothType1
andTrueType
alphabeticfontstake30Kto70Kstoragespaces,andType3
fontsmaybebigger.However,DBCSAsianfontsusuallyconsumeseveralMEGAbytesof
space.Itdependsonthequalityofdisplayandcostofstorage(ortransmission)todecide
whethertoembedDBCSfontsinPDFdocuments.
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