/trantor-pdf-converter

Java Library to transform images and LibreOffice-suported doc formats to PDF

Primary LanguageJavaGNU General Public License v3.0GPL-3.0

PDF Image Utils

This library allows you to import scanned TIFF files and convert them into PDF 1.4 format. Additionally, a PNG thumbnail is generated. It can import image PDFs too. As the development goes on, more image formats (GIF, PNG, JPEG) are going to be accepted and converted to PDF. In any case, the minimum resolution for the files to be accepted is 300dpi. Thumbnails are generated at a resolution of 72 dpi.

For now, this is a work in progress for an internal JRuby project. However, the information on the Internet is so scarce and spread, that this code might help you.

The main goal is achieving PDF/a1-b compliance in order to store these images in a document archive.

Usage

  1. Make sure you have at least Open/Oracle JDK 1.7.0_15
  2. Clone the project.
  3. The dependency named image-filters is fetched froum our local Nexus repository. If you don't have a local Maven repo, please download them to a known directory and change the dependency scope to system.
  4. Execute mvn clean install.
  • The JRuby gem is ready to be generated from target/ruby-gem. There is an experimental gem already deployed at RubyGems
  • For Java users: the artifact is located under the target/ directory. Its dependencies are located under target/ruby-gem/lib. The binary extensions and their JNI adapters are located under target/ruby-gem/lib.

Note that, if you want to use the artifacts from pure Java, the binary dependencies (.so files) require the following environmental variables to be set:

  1. JAIHOME must point to the directory where libclib_jiio.so and libmlib_jai.so are located.
  2. Add JAIHOME to your CLASSPATH too.
  3. LD_LIBRARY_PATH (or LD_RUN_PATH if not executed from commandline or script) must include JAIHOME.

Thus, any Java application using imageutils should declare the variables above. The JRuby gem declares the variables above automatically when required.

Known issues

  • Binary dependencies (jai & jai_imageio) are downloaded for linux-amd64. If you want to change the target platform, have a look at the project's pom.xml.
  • AFAIK, there is a bug up to JRuby 1.7.3 that prevents pushing gems to RubyGems. So if you want to publish your own gem, at least 1.7.4-dev should be used. In my case, the gem was pushed via MRI 1.9.3.

TODO

  • Improve PDF image extraction.
  • Generate ISO 216-A page sizes dinamically.
  • Generate PDF/A-1b from scanned image PDF
    • Insert RDF & metadata into target PDFs.
  • Deploy as a Maven artifact.
  • JavaDocs.
  • Tests:

Licenses

  • GNU Lesser General Public License, version 3. See LICENSE file for the whole enchilada.
  • See the licenses/ directory for additional software licenses and terms of service notices.