I am using Apache PDFBox and going page by page to extract text. But at the same time I have to remove the strike-through text which comes in between.
I tried :
Detect Bold, Italic and Strike Through text using PDFBox with VB.NET
but its failing for most of my scenarios.
I also tried:
PDFBox delete comment maintain strikethrough
Are there any libraries present which do this?
Related
Today i tried to search a Arabic word in a PDF file that contained Arabic content.
All PDF reader soft wares cannot search any Arabic word in this PDF file.
So I dragged PDF file into Firefox browser and selected a area that contained some words by inspect elements and saw this:
hw ½oiC instead of آخرین سخن
What is type of the encoding used in this PDF file?
how can i encode this to normal text?
It's difficult to comment on the file you are looking at without seeing it but a good starting point is to try Acrobat and by either copying the text and pasting it into a text editor or doing a search for the text content will reveal if it can be extracted correctly or not.
If it can't be extracted properly then there's a good chance the font is lacking a ToUnicode entry (see Section 9.10.1 of the ISO PDF 32000-1:2008 specification for more information).
I have an application, that extracts headings out of pdf files. The documents, that the application is supposed to work with, all have more or less coherent structure and formatting, in fact, telling if a text chunk is bold or not, is very important. Recently I came across a bunch of files, where some chunks visually appear bold, but do not have "bold" piece in string representation of font. The following SO thread how can i get text formatting with iTextSharp helped me to understand, that there is one more way of making text appear bold. However in my case calling GetTextRenderMode() does not help either, as it returns 0 as if it were normal text. So are there any other ways of making text appear bold, and is it possible to detect it using iTextSharp ?
You are making the assumption that the font inside your PDF file knows if it's bold or not. Let's take a look inside and check if your assumption is correct.
This is what the subset JOJJAH of the font TT116t00 looks like when you look at the internals of the PDF file you have shared:
We see that the font is of subtye /TrueType, we see that the /ItalicAngle is 0, and... we see that the 3rd bit of the /Flags is set. Let's check the PDF reference to find out what this tells us:
I quote:
The font contains glyphs outside the Adobe standard Latin character set.
The glyphs look bold, because the glyphs are drawn in a way that they appear bold. You see the font as bold because you are human. However, when a machine looks at the font, it doesn't have a clue that the font is bold. A machine just follows the instructions stored in the /FontFile2 stream.
In short: iTextSharp doesn't have any indications that the font is bold.
I have an application, that extracts headings out of pdf files. The documents, that the application is supposed to work with, all have more or less coherent structure and formatting, in fact, telling if a text chunk is bold or not, is very important. Recently I came across a bunch of files, where some chunks visually appear bold, but do not have "bold" piece in string representation of font. The following SO thread how can i get text formatting with iTextSharp helped me to understand, that there is one more way of making text appear bold. However in my case calling GetTextRenderMode() does not help either, as it returns 0 as if it were normal text. So are there any other ways of making text appear bold, and is it possible to detect it using iTextSharp ?
You are making the assumption that the font inside your PDF file knows if it's bold or not. Let's take a look inside and check if your assumption is correct.
This is what the subset JOJJAH of the font TT116t00 looks like when you look at the internals of the PDF file you have shared:
We see that the font is of subtye /TrueType, we see that the /ItalicAngle is 0, and... we see that the 3rd bit of the /Flags is set. Let's check the PDF reference to find out what this tells us:
I quote:
The font contains glyphs outside the Adobe standard Latin character set.
The glyphs look bold, because the glyphs are drawn in a way that they appear bold. You see the font as bold because you are human. However, when a machine looks at the font, it doesn't have a clue that the font is bold. A machine just follows the instructions stored in the /FontFile2 stream.
In short: iTextSharp doesn't have any indications that the font is bold.
I'm developing a new function to "my" program. This function is able to write PDF files by the simple way, making a simple text file with some codes of PDF standard.
I'm trying to understand how it works yet, but my first problem is about how to apply bold on some line of my document.
I've already downloaded the PDF REFERENCES GUIDE, but I've not found nothing about it.
Any idea?
PDF is not like HTML where you can apply formatting tags for emphasis. As you've read in the PDF reference, all that you do in PDF is to setup a graphics environment (colours used, fonts used, etc) and then put text on the page.
If you want to have something show in bold, use a font that is bold. If you want to have something show in italic, use a font that is italic.
Older software used dirty tricks to create "bold-alike" text, but the good (and easy) way to do it is to make sure you select the correct font before you start drawing text.
I have PDF files with text that should be replaced. More specificly, the text should be translated and replaced with the translated version.
It's important that the rest of the PDF structure stays intact. Note that the text is available in the PDFs and techniques like OCr are not needed. Also, it would be nice if font and other text attributes are kept.
Which libraries would you recommend for extracting the text to an easy to edit format (such as CSV) and put the new text back in again?
Assuming you are replacing text with a different language, you will have to choose a different font in most cases, and the font choice is non-trivial. I've used the Foxit libraries to change text or create PDFs with success.