Create searchable PDFs and optimize their use
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Mark Up and Comments
The PDF format is highly suited for exchanging documents independently of platform and application. The exchange works almost as well as if you had printed out the document and sent it. One disadvantage to the electronic version is that it is not as easy to highlight sentences and passages, place post-its with comments, or simply circle an item.
However, the PDF format also has a function for performing these kinds of actions. The function varies in scope depending on the document viewer. Okular offers comments, mark ups, and simple paint tools (Figure 6). Evince users have to make do with adding notes. The various types of markings for both programs can be displayed without any problems.
Figure 6: Okular allows you to mark items in the text and add comments in several ways.
Conclusion
We use PDF files everyday. An extensive offering of useful programs available for Linux allow you to create searchable PDFs from scans and then modify them as desired. These programs provide the tools necessary for taking advantage of the many possibilities that the PDF format brings to the table.
Infos
- Tesseract OCR: http://github.com/tesseract-ocr
- OCRmyPDF: http://github.com/jbarlow83/OCrmyPDF
- Unpaper: http://www.flameeyes.eu/projects/unpaper
- Pdfgrep: http://pdfgrep.org
- OCRFeeder: http://wiki.gnome.org/Apps/OCRFeeder
- PDF Toolkit: http://www.pdflabs.com/tools/pdftk-server
- PDF Chain: http://pdfchain.sourceforge.net
- Krop: http://arminstraub.com/software/krop
- Ghostscript: http://ghostscript.com
- "Adobe Acrobat Security: PDF Security Development": http://www.locklizard.com/acrobat-security/
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