open pdf file in new tab in asp.net c# : Pdf editor online delete text control SDK platform web page wpf asp.net web browser pdfkungfoo-sample5-part1329

IVColors
Pdf editor online delete text - delete, remove text from PDF file in C#.net, ASP.NET, MVC, Ajax, WinForms, WPF
Allow C# developers to use mature APIs to delete and remove text content from PDF document
pull text out of pdf; how to delete text in pdf converter
Pdf editor online delete text - VB.NET PDF delete text library: delete, remove text from PDF file in vb.net, ASP.NET, MVC, Ajax, WinForms, WPF
VB.NET Programming Guide to Delete Text from PDF File
pdf text remover; delete text from pdf online
11HowcanIconvertacolorPDFinto
grayscale?
IhaveabunchofPDFdocumentswithlotsofcolorimagesinside.Iwanttogetthemprintedand
wanttomakesurethatnocolorisused.SoIthoughtconvertingthemtoall-grayscalePDFswould
beagoodidea.AlsoIwanttoofferthesedocumentsfordownload–soconversiontograyscale
seemstobeawaytoreducethefilesize.Isthiscorrect?
HowcanIachievethiswithGhostscript?
11.1Answer
Yes,itiscorrectthatgrayscaleinsteadofcolorimagesinsidePDFsingeneraldoreducethefilesize.Iwill
showthiswithasmallexample.
Acommandtodothatisthefollowing:
1
gs
\
2
-o gray.pdf
\
3
-sDEVICE=pdfwrite
\
4
-sColorConversionStrategy=Gray \
5
-sProcessColorModel=DeviceGray \
6
color.pdf
Aslongastheimage’sresolutionremainsunchanged,acolor-to-grayconversionshouldsignificantly
reducethesize:
• RGBimagesuse3colorchannels(red,green,blue)
• CMYKimagesuse4colorchannels(cyan,magenta,yellow)
• Grayimagesuseonlyonecolorchannel
Assumingthesamelevelofcolordepthforeachimagetype,thismeansthatratiosfortherawamountof
uncompressedimagedatawithequally-dimensionedimages1:3:4forgray:rgb:cmykimages.
Ofcourse,inthereallifeimagesarecompressed.Dependingontheiractualcontents,differentcompres-
sionalgorithmswillchangethisratios–butforafirstapproximationtheyareanimportantconsideration
tomake.
42
C# HTML5 PDF Viewer SDK to view, annotate, create and convert PDF
font and size, bold and highlight text in easy to set a password to PDF online directly in Except password setting, RasterEdge HTML5 PDF Editor also enable C#
remove text watermark from pdf; how to delete text in pdf document
VB.NET PDF- HTML5 PDF Viewer for VB.NET Project
ONLINE DEMOS: Online HTML5 Document Viewer; Online XDoc.PDF C# Page: Insert PDF pages; C# Page: Delete PDF pages; C# PDF Viewer; VB.NET: ASP.NET PDF Editor; VB.NET
how to erase text in pdf; how to copy text out of a pdf
HowcanIconvertacolorPDFintograyscale?
43
Thepicturebelow¹showstheoriginalinputfile,color.pdf,vs.theresultinggrayscaleoutput,gray.pdf.
Left:originalcolorPDF–Right:grayscalePDFconvertedwithGhostcript.(ColorimageusedinthePDFisbyCraig
ONeal(“minds-eye”),licensedunderCreativeCommons‘BY-SA2.0’.)
Comparingthefilesizesofthesetwofilesshowsthis:
color.pdf
:2,6MByte
gray.pdf
:172kBbyte
Sointhisspecificcasetheconversionreducedthefilesizetoroughly6%oftheoriginal.
Note, not t every single color-to-gray conversion n will l show the same amount t of f file e size
reduction.****Thereductionratioverymuchdependsontheamountofcolorimagesused
intheoriginalPDFvs.theamountoftextorotherelements.
Tofurtheranalysewhathashappenedtotheimageduringconversion,wecanuse
pdfimages
and
pdfinfo
likethis:
1
pdfimages -list color.pdf
2
page
num type
width height color comp bpc c enc c interp p object t ID
3
---------------------------------------------------------------------
4
1
0 image
1280
825 rgb
3
8 image no
4 0
5
6
7
pdfimages -list gray.pdf
8
page
num type
width height color comp bpc c enc c interp p object t ID
9
---------------------------------------------------------------------
10
1
0 image
1280
825 gray
1
8 jpeg
no
10 0
11
12
¹
Fordetailsabouttheoriginalcolorimageseechapter“Acknowlegements”
C# PDF Page Delete Library: remove PDF pages in C#.net, ASP.NET
able to delete PDF page in both Visual C# .NET WinForms and ASP.NET WebForms project. Free online C# class source code for deleting specified PDF pages in .NET
online pdf editor to delete text; pdf editor online delete text
VB.NET PDF Page Delete Library: remove PDF pages in vb.net, ASP.
Enable specified pages deleting from PDF in Visual Basic .NET Online source codes for quick evaluation in VB.NET for a solution to conveniently delete one page
delete text from pdf; how to delete text from pdf reader
HowcanIconvertacolorPDFintograyscale?
44
13
pdfinfo color.pdf f | | grep "Page e size:"
14
Page size:
595 x x 510 0 pts
TheimageinthePDFusestheRGBcolorspace.Sincethewidthofthepageis595PostScriptpoints(where
72pt==1inch),andthewidthoftheimage(borderlessonthepage)is1280pixels,theresolutionofthe
imageasembeddedinthePDFpagecaneasilybecalculated.Inthecurrentcasethatresolutionforboth,
color.pdf andgray.pdf is152ppi(pixelsperinch).
Assumingtheoriginalcolorimagehadbeenofahigherresolution.With300ppi(4timesthenumber
ofpixelsthanat150ppi)thePDFsizecouldeasilyhaveexceeded10MByte.With600ppi(16timesthe
numberofpixelsthanat150ppi)itcouldhaveexceeded40MByte.
Convertingthesehigh-resolutioncolorimagestograyscalewouldalsosignificantlyreducethefilesize.
Butwhendoingthisconversion,youcouldatthesametimedownsampleallhighresolutionimagesto,
say,150ppi.Hereishowyou’dachievethis:
1
gs
\
2
-o 150ppi-gray.pdf
\
3
-sDEVICE=pdfwrite
\
4
-sColorConversionStrategy=Gray
\
5
-sProcessColorModel=DeviceGray
\
6
-dDownsampleMonoImages=true
\
7
-dMonoImageResolution=150
\
8
-dMonoImageDownsampleType=/Bicubic \
9
-dMonoImageFilter=/CCITTFaxEncode
\
10
-dMonoImageDownsampleThreshold=1.0 \
11
-dDownsampleGrayImages=true
\
12
-dGrayImageResolution=150
\
13
-dGrayImageDownsampleType=/Bicubic \
14
-dGrayImageFilter=/DCTEncode
\
15
-dGrayImageDownsampleThreshold=1.0 \
16
-dDownsampleColorImages=true
\
17
-dColorImageResolution=150
\
18
-dColorImageDownsampleType=/Bicubic \
19
-dColorImageFilter=/DCTEncode
\
20
-dColorImageDownsampleThreshold=1.0 \
21
600ppi-color.pdf
As you can seefrom thevarious command lineparameters, you could differentiatebetween color,
grayscaleaswellasmonoimagesandgivedifferentparametersforeachtype.AboveIusedthesame
onesforeach.
Threeparameterswhichdeservespecialmentionherearethe{Mono,Gray,Color}DownsampleThreshold
ones.Theirdefaultvalueis
1.5
.Thismeansthatdownsamplingwillonlyhappen,iftheoriginal’simage
resolutionis1.5timesashighorhigherthanthetargetimage’sresolution.Ifyouhaveanimageof250
ppiembeddedinaPDFpageitsresolutionwillremainunchangedfora150ppitarget.Imageswillonly
bedownsamplediftheyareat225ppiorabove.Settingthe{Mono,Gray,Color}DownsampleThresholdsto
C# HTML5 PDF Viewer SDK to create PDF document from other file
ONLINE DEMOS: Online HTML5 Document Viewer; Online XDoc.PDF C# Page: Insert PDF pages; C# Page: Delete PDF pages; C# PDF Viewer; VB.NET: ASP.NET PDF Editor; VB.NET
how to delete text in pdf file online; acrobat remove text from pdf
C# PDF insert text Library: insert text into PDF content in C#.net
SharePoint. Able to add a single text character and text string to PDF files using online source codes in C#.NET class program. Insert
delete text pdf files; delete text pdf
HowcanIconvertacolorPDFintograyscale?
45
1.0
enforcesthedownsamplingofeachandeveryimagethathasahigherresolutionthanthetarget.
VB.NET PDF Text Extract Library: extract text content from PDF
Best VB.NET PDF text extraction SDK library and component for free download. Online Visual Basic .NET class source code for quick evaluation.
remove text from pdf; erase text from pdf file
C# PDF Text Extract Library: extract text content from PDF file in
Free online source code for extracting text from adobe PDF document in C#.NET class. Able to extract and get all and partial text content from PDF file.
how to delete text from a pdf document; pdf text remover
VUsing
pdfmarks
12HowcanIuse
pdfmark
toinsert
bookmarksintoPDF?(CONTENTSTILL
MISSING)
47
VITextextraction
13HowcanIextracttextfromPDF?
(CONTENTSTILLMISSING)
49
VIIMiscellaneous
Documents you may be interested
Documents you may be interested