how to show pdf file in asp.net page c# : How to make a pdf document text searchable software Library project winforms asp.net windows UWP nitro-pro-9-user-guide-en7-part206

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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
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OCR
an
existing
PDF
file
l
Troubleshoot
OCR
NitroPro9-UserGuide
How to make a pdf document text searchable - search text inside PDF file in C#.net, ASP.NET, MVC, Ajax, WinForms, WPF
Learn how to search text in PDF document and obtain text content and location information
convert pdf to searchable text online; text select tool pdf
How to make a pdf document text searchable - VB.NET PDF Text Search Library: search text inside PDF file in vb.net, ASP.NET, MVC, Ajax, WinForms, WPF
Learn How to Search Text in PDF Document and Obtain Text Content and Location Information in VB.NET application
find and replace text in pdf; pdf text search tool
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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 Convert to Text SDK: Convert PDF to txt files in C#.net
Thus, please make sure you have installed VS 2005 or above versions and .NET Framework 2.0 or Now you can convert source PDF document to text file using the
how to select text in pdf image; select text in pdf reader
VB.NET Image: Robust OCR Recognition SDK for VB.NET, .NET Image
After selecting document pages for recognition, we adopt the most can be Png, Jpeg, Tiff, image-only PDF or Bmp image file formats, so you can make all desired
pdf searchable text converter; search pdf for text
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©Nitro
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
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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
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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
VB.NET PDF Convert to Text SDK: Convert PDF to txt files in vb.net
Before you get started, please make sure that you have installed the Microsoft we will show you an example code of converting PDF document to text file in a
convert a scanned pdf to searchable text; find text in pdf files
Online Convert PDF to Text file. Best free online PDF txt
We try to make it as easy as possible to convert your NET solution for Visual C# developers to convert PDF document to editable & searchable text file
select text in pdf file; find and replace text in pdf file
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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
VB.NET Create PDF Library SDK to convert PDF from other file
Create writable PDF file from text (.txt) file in VB.NET project. Creating a PDF document is a good way to share your ideas because you can make sure that
how to select text in pdf reader; converting pdf to searchable text format
OCR Images in Web Image Viewer | Online Tutorials
Recognizing Pages; Scan a document and convert it to a searchable PDF file; Before you OCR images or doucments in Web Document Viewer, make sure that you
convert pdf to searchable text; text searchable pdf
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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 Image: Start with RasterEdge .NET Imaging SDK in Visual
RasterEdge.Imaging.MSWordDocx.dll: Word document displaying and are capable of recognizing text from scanned documents, images or existing PDF documents and
how to select all text in pdf file; how to select text in pdf
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©Nitro
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
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Annotate
with
text
mark-
up
tools
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Annotation
layer
and
content
layer
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Attach
files
as
annotations
NitroPro9-UserGuide
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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
NitroPro9-UserGuide
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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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