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OCR
OpticalCharacterRecognition,orOCR,isasoftwareprocesswhichenablesimagesofprintedtexttobe
translatedintomachine-readabletext.OCRismostcommonlyusedwhenscanningpaperdocumentsto
createelectroniccopies,butcanalsobeperformedonexistingelectronicdocuments(e.g.PDF).
YoucanlearnmoreaboutOCRbyreadinganyofthefollowingtopics:
l
OCR
preferences
l
Scan
and
OCR
a
printed
document
l
OCR
an
existing
PDF
file
l
Troubleshoot
OCR
NitroPro9-UserGuide
Best way to compress pdf - Compress reduce PDF size in C#.net, ASP.NET, MVC, Ajax, WinForms, WPF
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OCRPreferences
TheI.R.I.S.OCRpluginfullyintegrateswithNitroPro9allowingittorecognizetextfromscannedpages,
orfromimagesinopenPDFdocuments.TheOCRutilityisfullycustomizable,withoptionstoconfigure
optionssuchasskewedimagecorrection,toimagecompressionsettings.Youcanalsoenabletext
recognitionforscannersdirectlyontheCreatePDFFromScannerdialog,toautomaticallycreatePDF
documentsfromscannedpageswithtextthatcanbemodifiedorsearched.
ToconfigureOCRpreferences:
1. ClicktheFilemenubuttoninthetop-leftcorneroftheapplication
2. ClickonthePreferencesbuttonatthebottomofthemainmenu
3. InthePreferencesdialog,clickonOCRinthecategoriescolumn
OCRGeneralPreferences
ThegeneralpreferencestoconfiguretheOCRfunctionalityaresplitinto3categories,withthefollowing
options:
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Correctimageskew:Straightenanytextwhichisskewedonthescanneddocument
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Usefixedthreshold:Thresholdingistheprocessofanalyzingthehistogramofanimageto
distinguishthetextfromthebackground.Afixedthresholdappliesthesamecut-offpointtothe
entireimage,asopposedtofindingthetextdynamically.Thepercentagevaluesindicatethepoint
atwhichthecontrastbetweenblacksandwhitesisidealtorecognizetext,with0%being
completelydarkand100%beingcompletelywhite.Thissettingisrecommendedifanimage
containsdifferentbackgroundcolors,orabackgroundwhichvariesinshadingorgradient.For
morecommonOCRoperations,itisrecommendedtodisablethefixedthresholdsetting
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Detecttextorientation:Rotatepagesautomaticallywhentheyhavebeenscannedat90,180,or
270degreeangles
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Smoothcolorimage:FlattenoutthecolorsoftheimagetoremovetheJPEGcompressionartifacts
andhelprecognition
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Language:Selectthelanguageofthescannedtextyouwanttodetect
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Quality:
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Low(fast):Ideallyusedwhenthetextonthescanneddocumentisverycrispandeasyto
recognize.Thissettingallowsscanstobeperformedquickly
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Medium(medium):RecognitionismoreprecisethantheLowsetting,requiringthescanto
takeslightlylonger
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High(slow):Recommendedforscanningtextwhichishardertorecognize.Scantimewith
thissettingisnoticeablylongersincetherecognitionmethodsaremorecomplex
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Downsampleimages:Afterthescaniscomplete,youareabletoreducetheresolutionofyour
scannedimagestolowerthesizeoftheresultantPDFdocument
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Imagecompressionfactor:Themoreanimageiscompressed,thesmallerthefilesizeofthe
outputPDF.However,ifyourPDFdocumentisintendedforprint,lowcompressionis
recommendedtopreservequality
NitroPro9-UserGuide
C# PDF Text Redact Library: select, redact text content from PDF
File: Compress PDF. Page: Create Thumbnails. Page: Insert PDF Pages. Page: Delete Existing PDF Pages. Provide a best and easy way to darken text in PDF
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C# PDF File Split Library: Split, seperate PDF into multiple files
Best and professional adobe PDF file splitting SDK for Visual Studio control, XDoc.PDF, provides an advanced C# programming way to split PDF document into
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UseascannertoOCRaprinteddocument
ToscanandOCRaphysicaldocument:
1. OntheHometab,intheCreategroup,clickthePDFbutton,thenFromScanner
2. IntheScanSettingsdialog,selectyourscannerdevice
3. Selectthesheetstobescaned,andthenspecifythefile'sdestination
4. IntheImagecompressionsection,configurethepreferencesforthedocument'simages:
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Color/Grayscale
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JPEG:ThemainJointPhotographicExpertsGroupstandardachieves10:1
compressionratioswithlittleperceptiblequalityloss
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JPEG2000:AchieveshighercompressionratiosthanJPEG,andusesbothlossyand
losslesscompressioninthesamefilestream
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ZIP:UsestheZIPcompressionalgorithmtoreducetheimagesizewithoutaffecting
quality
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Monochrome
l
CCITTGroup4:Afaxdocumenttransmissionstandardwhichusesadvanced
compressionmethodsforlosslessreproduction
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CCITTGroup3:TheGroup3standardachieveslesscompression,andisless
advancedthantheCCITTGroup4method
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RunLength:Particularlyeffectiveonfilesthatcontainmanylongrunsofthesame
bit,value,orcharacter.Thismethodisprimarilyusedonbinaryfiles
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ZIP:UsestheZIPcompressionalgorithmtoreducetheimagesizewithoutaffecting
quality
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Quality
l
150DPI:Mightbesuitableforuseonthewebduetothesmallerfilesizeproduced,
howeverwillnotproducehighqualityprints
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200DPI:Suitableforhigherqualityviewingoncomputermonitors
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300DPI:Thestandardgenerallyusedforofficequalityprints,andgeneratesslightly
largerfilesizes
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600DPI:Generateslargefilesizes,howeveritisrecommendedforhighprintquality
oftheimage
5. CheckMakedocumentsearchabletoenabletheOCRplugin,andclicktheAdvancedbuttonto
setyourpreferences
6. ClickScantolaunchyourdefaultscanningsoftware
7. ClickScantobeginthescanningprocess(somescannerdriversrequireyoutoClosethedialog
oncethescaniscomplete)
8. ClickFinishoptiontoendyourscanningjob,orselecttheScanfrontofsheettwotocontinue
scanning
9. Ifyouscannedmultiplepages,clickingFinishwillopenthescanneddocumentinNitroPro9
NitroPro9-UserGuide
C# PDF Convert to Tiff SDK: Convert PDF to tiff images in C#.net
Best C#.NET PDF converter SDK for converting PDF to high-fidelity PDF to TIFF conversion in an easy way. Using this .NET PDF to TIFF conversion control, C#
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C# Image: Zoom Image and Document Page in C#.NET Web Viewer
gif, bmp (bitmap), tiff / multi-page tiff, PDF, etc This "Best Fit" function will help developers and users view & To put it in another way, after you activate
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OCRanexistingPDF
ToOCRadocument:
1. InNitroPro9,openaPDFdocumentyouwanttoOCR
2. OntheEdittab,clicktheOCRbuttonintheText/Imagespanel
3. IntheOpticalCharacterRecognition(OCR)dialog,choosewhethertheoutputtextshouldbe
SearchableorSearchableandEditable
4. ClicktheOptionsbuttontoselectatargetpagerange,andclickAdvancedtoconfigureOCR
preferences
5. ClickOKtorecognizethedocument'stext
ToOCRselectivepagesinadocument:
1. Fromthenavigationtabs(displayedalongtheleftsideoftheNitroPro9window),clickthePages
tab
2. Right-clickontherequiredpagesinthePagespaneandselectOCRPages...(holddownControl
toselectmany)
3. IntheOpticalCharacterRecognition(OCR)dialog,choosewhethertheoutputtextshouldbe
SearchableorSearchableandEditable
4. ClicktheOptionsbuttontoselectatargetpagerange,andclickAdvancedtoconfigureOCR
preferences
5. ClickOKtorecognizethedocument'stext
NitroPro9-UserGuide
C# WPF PDF Viewer SDK to annotate PDF document in C#.NET
Best WPF PDF Viewer control for PDF annotating in .NET WPF class. 3. Wavy underline text. Click to add way underline under selected PDF text. 4.
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VB.NET PowerPoint: Merge and Split PowerPoint Document(s) with PPT
Then the best way to reach this target is to use a PPT slides/pages combiner Note: If you want to see more PDF processing functions in VB.NET, please follow the
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TroubleshootOCR
TheresultsofOpticalCharacterRecognition(OCR)aresomewhatdependentonthequalityofthe
electronicdocument,soherearesometipstohelpyouimproveOCRresults:
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SetthescannercolorsettingstoGrayscale,orBlackandWhiteifthetextisblackagainstawhite
background
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Ifsupportedbyyourscanner,adjustbrightnessandcontrasttoachievedeepblacksandbright
whites
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Setthescanquality(resolution)to300dpiorbetter
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Startwithagoodoriginaldocument.WrinklesandcreasesmighthinderOCRaccuracy
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Ensurescannerglassiscleanandfreefromsmudges
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Keepyourpagesasstraightaspossibleduringscanning.Skewedpagesrequiremoreprocessing
intheOCRengine
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Dependingonthequalityofyourscanner,youmightneedtoattemptseveralscansofthesame
documenttoprocessthebestresultingimage
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Ifyourtextisonapatternedorcoloredbackground,trytoobtainanotherversiononaplainwhite
background.Textagainstcoloredbackgroundsorgradientswillrequireseveralattemptswithdif-
ferentsettingsuntiltherightconfigurationforsuccessfulOCRisfound
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Somesmudgescanbemanuallyrepairedbyusingwhitecorrectionfluidtocoverunwantedarti-
facts
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Ifsupportedbyyourscanner,enablethedespecklesettingtoremovenoisefromyourimage
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Ifsupportedbyyourscanner,increasetextsmoothingtoremoveharshblendsandgrain
NitroPro9-UserGuide
VB.NET Create PDF Library SDK to convert PDF from other file
Best VB.NET component to convert Microsoft Office Word, Excel and PowerPoint to searchable PDF document. Creating a PDF document is a good way to share your
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VB.NET PDF - Annotate PDF with WPF PDF Viewer for VB.NET
Best WPF PDF Viewer control as well as an advanced PDF annotating software for Visual Basic .NET Click to add way underline under selected PDF text. 4.
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Reviewandcomment
TheNitroPro9textmark-uptoolsletyouworkwithaPDFfileasifitwereaprintedonpaper,andyoucan
undoandredoamodificationshouldyouwishtocorrectamistake.
Anannotationcommentisanon-destructiveelement,whichisaddedasanextralayeroverthepageof
yourPDF,andcanberemovedatanytime.Ifyouwantcommentstoappearwhenyouprintyour
document,youhavetospecificallyenableannotationsinyourprintsettings.
Youcanaddcommentstopagesasstickynotes,texthighlighting,drawingmarkups,stamps,andfile
attachments.
Mosttypesofcommentsincludeapop-upnote,enablingyoutoaddadditionalfeedback.Forexample,if
you’vemarkedsometextwiththeHighlightTexttool,youcanopenthecorrespondingpop-upnoteand
typeanexplanationtoclarifywhyyou’vehighlightedit.YoucanalsousetheCommentspanetoview,
manageandorganizecommentsfromothers.
AllcommentinganddrawingtoolsareaccessiblefromtheReviewtab.
FormoreinformationaboutcommentsandannotationsinPDFfiles,see:
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Add
or
edit
notes
l
Annotate
with
text
mark-
up
tools
l
Annotation
layer
and
content
layer
l
Attach
files
as
annotations
NitroPro9-UserGuide
C# PDF Page Move Library: re-order PDF pages in C#.net, ASP.NET
Best Visual Studio .NET PDF file edit SDK for sorting PDF or just change the position of certain one PDF page in an extremely easy and quick way using C#
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C# PDF Text Box Edit Library: add, delete, update PDF text box in
A best PDF annotator for Visual Studio .NET supports to add text box to PDF file in Visual C#.NET Adding text box is another way to add text to PDF page.
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CollaborateonlinewithNitroCloud
SharingdigitaldocumentsforcollaborationwasadecisivefactorinthecreationofthePDFdocument
standard.Whetheryouneedtofilloutandsignaform,orreviewandannotateadocument,NitroCloud
bringsreal-timecloudcollaborationtoNitroPro9,andenablesmultiplecontributorstoworkonthe
samedocumentatthesametime.
NOTE:AnInternetconnectionisrequiredtocreateaNitroCloudaccountandsharePDFfiles.
GettingstartedwithNitroCloud
Createanaccount:
ANitroCloudaccountisrequiredtostoreyourPDFfilesandtrackcollaborationprivatelyandsecurely.
YoucancreateaNitroCloudaccountdirectlythroughNitroPro9.
1. ClicktheNitroCloudmenuinthetoprighthandcornerofNitroPro9,andthenclickSignUp
2. IntheSignUpdialog,enteryourfullnameandemailaddressandclicktheSignUpbutton
3. LogintoyouremailaccountandconfirmyouraddressbyclickingthelinkintheemailfromNitro
Cloud.Ifyoudidnotreceivetheemail,checkyourspamfolderorclicktheResendConfirmation
EmailbuttonintheNitroPro9dialog
4. TheconfirmationlinkwillloadNitroCloudinyourwebbrowser.Setyourpreferredpasswordand
modifyyournameandtimezonesettingsasrequired.
5. ClickStartusingyourNitroCloudaccount
6. InNitroPro9,clickContinuetolinkyourNitroCloudaccount
7. YoucannowclickUploadtosaveyourfirstPDFfiletoyourNitroCloudaccount
SharePDFfiles
SharePDFfilesusingNitroCloudtocollaborateinreal-timeoveradocumentreview,andenableothersto
signyourdocumentwithoutthetraditionalhasslesofprinters,pens,orunnecessaryemails.
TorequestaSignature:
1. OpenaPDFfileinNitroPro9
2. IntheCloudtab,ontheWorkflowpanel,clickRequestSignature
3. LogintoyourNitroCloud,andthenclickUpload
4. Whenthefilehasfinisheduploading,clickContinuetoNitroCloud
5. NitroCloudwilllaunchinyourdefaultwebbrowser.Followthepromptstoprepareyourdoc-
umentandshareitforsigning.
ToShareaPDFFile:
1. OpenaPDFfileinNitroPro9
2. IntheCloudtab,ontheWorkflowpanel,clickShare
3. LogintoyourNitroCloud,andthenclickUpload
4. Whenthefilehasfinisheduploading,clickContinuetoNitroCloud
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5. NitroCloudwilllaunchinyourdefaultwebbrowser.Followthepromptstoconfiguretherequired
methodforsharingthedocument.
ToCollaborateoveraPDFFile:
1. OpenaPDFfileinNitroPro9
2. IntheCloudtab,ontheWorkflowpanel,clickCollaborate
3. LogintoyourNitroCloud,andthenclickUpload
4. Whenthefilehasfinisheduploading,clickContinuetoNitroCloud
5. NitroCloudwilllaunchinyourdefaultwebbrowser.Followthepromptstodesignatethecol-
laboratorswhowillbeabletoreviewandannotatethePDFfile.
ManageyourNitroCloudaccount
Toviewyourdocuments:
1. ClicktheNitroCloudmenuinthetoprighthandcornerofNitroPro9,andthenclickLogin
2. IntheCloudtab,ontheAccountpanel,clickDocuments
3. NitroCloudwilllaunchinyourdefaultwebbrowserandshowalistofthedocumentsthatyoucan
share,edit,convert,andmore.
Tomanageyouraccount:
1. ClicktheNitroCloudmenuinthetoprighthandcornerofNitroPro9,andthenclickLogin
2. IntheCloudtab,ontheAccountpanel,clickManageAccount
3. NitroCloudwilllaunchtheaccountmanagementpageinyourdefaultwebbrowser,whereyoucan
setyouraccountdetails,changeyourpassword,manageyoursignaturesandnotifications,or
upgradeyouraccount.
Toupgradeyouraccount:
1. ClicktheNitroCloudmenuinthetoprighthandcornerofNitroPro9,andthenclickLogin
2. IntheCloudtab,ontheAccountpanel,clickUpgrade
3. NitroCloudwilllaunchthePlanDetailspageinyourdefaultwebbrowser,whereyoucanviewyour
currentplanandupgradeaccordingly.
NitroPro9-UserGuide
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Addoreditnotes
Justasyouwouldwithapaperdocument,youcanplacenotesandwriteannotationsanywhereinaPDF
file.Notesletyoudirecttheattentionofreaderstoaspecificareaofthepage,andtoincludespecial
instructionsforapersonreviewingthedocument.
Toaddanote:
1. IntheReviewtab,intheCommentpanel,clickAddNote
2. Clickonthepagewhereyouwishtoplacethenote,andayellowspeech-bubbleappears
3. Thenewnoteautomaticallyopensapop-upnote.Clickinsidethepop-upnotetoenteryourtext.
4. Tofinishaddingyourtext,clickanywhereoutsidetheannotation
5. Double-clickontheyellowspeech-bubbletoshoworhidethepop-upnote
NOTE:Youcanclickanddragtheyellowspeech-bubbletomoveitanywhereonthepageofyourdoc-
ument.
Toeditnoteproperties:
1. Right-clickthenoteoritsicon
2. Fromthemenu,selectProperties
3. OntheGeneraltab,youcanedittheAuthorandSubjectdetailsforthenote
4. OntheAppearancetab,youcaneditthevisualcharacteristicsofthenote
5. ClickClosetosaveyourchanges
Defaultnoteproperties
TomakeallyourfutureNotestolookthesameastheselectednote:
1. Right-clickthenoteoritsicon
2. SelectMakeCurrentPropertiesDefault
TIP:Notesresideontheannotationlayer.Theydonotappearinsearchresults,andarenotprinted
withthedocumentunlessyouspecifythatyouwanttoprintwithmarkup.Formoreinformation,see
Annotation
layer
and
content
layer
.
Toreplytoanote:
1. Ifthetextforthenoteishidden,double-clickonthespeechbubbletomakethepop-upnote
appear
2. Onthepop-upnote,clicktheOptionsmenu,thenselectReplyfromthemenu
3. Apop-upnoteofadifferentcolorappearsinsidetheoriginalone.Writeyourreplyinthenewpop-
upnote.
4. Tofinishaddingyourtext,clickanywhereoutsidetheannotation
TIP:Youcaninsertmorethanonereply,whichallowsyoutobuildamessagethreadinthesame
annotation.
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Todeleteanote:
1. Right-clickonthespeechbubbletobringupthecontextmenu
2. Inthemenu,selectDelete
NitroPro9-UserGuide
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