The Problem: I have a large folder with many subfolders with many pdfs in them. Some of them already have OCR on them. Some of them don't. So i wanted to write a Java Program to filter the non OCR PDFs out and copy them to a hot folder.
I tested like 20 Documents and what they all have in common is, that if you open them with editor, you can find the word 'font' and the OCR ones and you cant find it in the non OCR ones. My Question now is: How do i implement this check using PDFbox 2.0.0 ? All the solutions i found dont seem to work only with older versions. And I'm not capable of finding a solution in the documentation. (which is clearly my fault)
Thanks in advance.
Here's how to find out if fonts are on the top level of a page:
PDDocument doc = PDDocument.load(new File(...));
PDPage page = doc.getPage(0); // 0 based
PDResources resources = page.getResources();
for (COSName fontName : resources.getFontNames())
{
System.out.println(fontName.getName());
}
doc.close();
Re: mkl suggestion, here's how to extract text:
PDFTextStripper stripper = new PDFTextStripper();
stripper.setStartPage(1); // 1 based
stripper.setEndPage(1);
String extractedText = stripper.getText(doc);
System.out.println(extractedText);
I am trying to create a java project that simply prints a project source code, be it java, php, c++ and others.
I can create the PDF just fine with iText, but now I need some kind of highlighting the java code I read the same way a code editor like sublime highlights. I discovered pdfbox: a library for creating/manipulating PDF files, but I can't find how to highlight code text(like sublime does) by using this library. Any help?
Copying from another SO question : highlight text using pdfbox when it's location in the pdf is known
PDDocument doc = PDDocument.load(/*path to the file*/);
PDPage page = (PDPage)doc.getDocumentCatalog.getAllPages.get(i);
List annots = page.getAnnotations;
PDAnnotationTextMarkup markup = new PDAnnotationTextMarkup(PDAnnotationTextMarkup.Su....);
markup.setRectangle(/*your PDRectangle*/);
markup.setQuads(/*float array of size eight with all the vertices of the PDRectangle in anticlockwise order*/);
annots.add(markup);
doc.save(/*path to the output file*/);
Kindly let me know any API to calculate the line count for RTF document.
Apache POI or Aspose works for document, but its not able to find line count for RTF.
Thanks.
Java already has a built-in RTF-Parser: RTFEditorKit.
Take a look at its read method.
For example:
test.rtf file contents
hello
stackoverflow
users
So, it has 3 lines separated by \n.
Code:
FileInputStream stream = new FileInputStream("test.rtf");
RTFEditorKit kit = new RTFEditorKit();
Document doc = kit.createDefaultDocument();
kit.read(stream, doc, 0);
String plainText = doc.getText(0, doc.getLength());
System.out.println(plainText.split("\\n").length);
Output = 3
You can use Aspose.Words for Java to get the number of lines of an RTF document. Please do the following:
Read RTF file using document class
Get BuiltInDocumentProperties object using getBuiltInDocumentProperties method
Now, get number of lines using getLines property of BuiltInDocumentProperties object
I hope this helps. Please note that I work as developer evangelist at Aspose. If you need any help with Aspose, do let me know.
I'm facing a problem when I try to read the content of a PDF document. I'm using iText 2.1.7 with Java, and I need to analyze the content of a PDF document: at first I was using the PdfTextExtractor's getTextFromPage method and it was working right, but only when the page is just text, if it contains an image, then the String that I get with the getTextFromPage is a set of meaningless symbols (maybe a different character encoding?), and I lose the content of the whole page. I tried with the last version of iText and works fine, but if I'm not wrong the license wouldn't be totally free (I'm working in a web application for a commercial customer, which serves PDFs on the fly) so I can't use it. I would really appreciate if you have any suggestion.
In case you need it, here is the code:
PdfReader pdf = new PdfReader(doc); //doc is just a byte[]
int pageCount = pdf.getNumberOfPages();
for (int i = 1; i <= pageCount; i++) {
PdfTextExtractor pdfTextExtractor = new PdfTextExtractor(pdf);
String pageText = pdfTextExtractor.getTextFromPage(i);
Thanks in advance, regards.
I think that you PDF has an inline image. I do not think that iText 2.1.7 will deal with that.
You can find information regarding the license here
Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers.
Questions asking us to recommend or find a tool, library or favorite off-site resource are off-topic for Stack Overflow as they tend to attract opinionated answers and spam. Instead, describe the problem and what has been done so far to solve it.
Closed 9 years ago.
Improve this question
I need a Java library to convert PDFs to TIFF images. The PDFs are faxes, and I will be converting to TIFF so that I can then do barcode recognition on the image. Can anyone recommend a good free open source library for conversion from PDF to TIFF?
I can't recommend any code library, but it's easy to use GhostScript to convert PDF into bitmap formats. I've personally used the script below (which also uses the netpbm utilties) to convert the first page of a PDF into a JPEG thumbnail:
#!/bin/sh
/opt/local/bin/gs -q -dLastPage=1 -dNOPAUSE -dBATCH -dSAFER -r300 \
-sDEVICE=pnmraw -sOutputFile=- $* |
pnmcrop |
pnmscale -width 240 |
cjpeg
You can use -sDEVICE=tiff... to get direct TIFF output in various TIFF sub-formats from GhostScript.
Disclaimer: I work for Atalasoft
We have an SDK that can convert PDF to TIFF. The rendering is powered by Foxit software which makes a very powerful and efficient PDF renderer.
we here also doing conversion PDF -> G3 tiffs with high and low res. From my experience the best tool you can have is Adobe PDF SDK, the only problem with it is its insane price. So we don't use it.
what works fine for us is ghostscript, last versions are pretty much robust and do render correctly majority of the pdfs. And we have quite a few of them coming during the day. In production conversion is done using the gsdll32.dll; but if you want to try it use the following command line:
gswin32c -dNOPAUSE -dBATCH -dMaxStripSize=8192 -sDEVICE=tiffg3 -r204x196 -dDITHERPPI=200 -sOutputFile=test.tif prefix.ps test.pdf
it would convert your PDF into the high res G3 TIFF. and prefix.ps code is here:
<< currentpagedevice /InputAttributes get
0 1 2 index length 1 sub {1 index exch undef } for
/InputAttributes exch dup 0 <</PageSize [0 0 612 1728]>> put
/Policies << /PageSize 3 >> >> setpagedevice
another thing about this sdk is that it's open source; you're getting both c and ps (postscript) source code for it. Also if you're going with another tool check what kind of an engine they have to power the pdf rendering, it could happen they are using gs for it; like for instance LeadTools does.
hope this helps, regards
You can use the icepdf library (Apache 2.0 License).
They even provide this exact use case as one of their example source code:
http://wiki.icesoft.org/display/PDF/Multi-page+Tiff+Capture
Maybe it is not neccessary to convert the PDF into TIFF. The fax will most likely be an embedded image in the PDF, so you could just extract these images again. That should be possible with the already mentioned iText library.
I don't know if this is easier than the other approach.
Take a look at Apache PDFBox - A Java PDF Library
No Itext can not convert PDFs to Tiff.
However, there are commercial libraries that can do that. jPDFImages is a 100% java library that can convert PDF to images in TIFF, JPEG or PNG formats (and maybe JBIG? I am not sure). It can also do the reverse, create PDF from images. It starts at $300 for a server.
Here is a good article and wrapper classes for using GhostScript with C# .NET...ended up using this in production
http://www.codeproject.com/KB/cs/GhostScriptUseWithCSharp.aspx
I have some great experience with iText (now, I'm using 5.0.6 version) and this is the code for tiff convertion into pdf:
private static String convertTiff2Pdf(String tiff) {
// target path PDF
String pdf = null;
try {
pdf = tiff.substring(0, tiff.lastIndexOf('.') + 1) + "pdf";
// New document A4 standard (LETTER)
Document document = new Document(PageSize.LETTER, 0, 0, 0, 0);
PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(pdf));
int pages = 0;
document.open();
PdfContentByte cb = writer.getDirectContent();
RandomAccessFileOrArray ra = null;
int comps = 0;
ra = new RandomAccessFileOrArray(tiff);
comps = TiffImage.getNumberOfPages(ra);
// Convertion statement
for (int c = 0; c < comps; ++c) {
Image img = TiffImage.getTiffImage(ra, c + 1);
if (img != null) {
System.out.println("page " + (c + 1));
img.scalePercent(7200f / img.getDpiX(), 7200f / img.getDpiY());
document.setPageSize(new Rectangle(img.getScaledWidth(), img.getScaledHeight()));
img.setAbsolutePosition(0, 0);
cb.addImage(img);
document.newPage();
++pages;
}
}
ra.close();
document.close();
} catch (Exception e) {
logger.error("Convert fail");
logger.debug("", e);
pdf = null;
}
logger.debug("[" + tiff + "] -> [" + pdf + "] OK");
return pdf;
}