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What are PDF Image Masks?

The PDF Mask features offer a whole set of functionality to allow complicated image drawing to happen. Rather than just sticking an image on...
Mark Stephens
1 min read

How much memory does your Java application use

I wanted to investigate the memory usage of our Java application to see how much memory was being used for a task – in...
Mark Stephens
1 min read

How are text links defined in a PDF file?

When you are viewing a PDF file, you may well notice that (like a web page) there are blue clickable links. These are defined...
Mark Stephens
1 min read

What are PDF Xref tables?

What are PDF Xref tables? Xref tables are part of the original PDF file specification and one of the features which gives the PDF...
Mark Stephens
1 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