Portable Document Format (PDF) is a file format used to present documents in a manner independent of application software, hardware, and operating systems.

PDF

What are PDF Xref tables?

TL;DR: A PDF Xref table is an internal “map” of byte offsets that tells a reader exactly where to find specific objects (like fonts...
Mark Stephens
2 min read

PDF stack overflow and underflow

The PDF format makes extensive use of stacks. A stack is like a pile of books. If you add an item it goes on...
Mark Stephens
1 min read

How are carriage returns, spaces and other gaps defined…

One of the biggest issues within PDF files we find is  the use of carriage returns, spaces and line feeds as gaps with the...
Mark Stephens
1 min read

Problems caused by Arial font in PDF files

The Arial Font Arial is a very popular font with a contemporary sans serif design. The font family is also on the font families...
Mark Stephens
1 min read

What is a PDF dictionary?

A PDF file is composed of many objects, each identified by a unique object number and generation number. Objects begin with the object number...
Mark Stephens
1 min read

Java images – 5 tips for Java ImageIO image…

We have been doing a lot of work recently on images in Java and will be writing a series of articles on JPEG2000 support,...
Mark Stephens
48 sec read