Annotate A PDF?

[Rohdekill]

I'm looking for guidance on this one...

I'm looking to clone the processes of Pegasus, which is able to create a new layer on each page of a PDF, and annotate (stamps, highlight, blackout, notes, etc..) all through a web app.

My question is, how does one merge the layers into the PDF? Obviously, it can be done - Pegasus does it.

[boogerjones]

It would be helpful to know the platform you will be using to achieve your goal; existing PDF classes (possibly free ones) may be able to achieve this depending on your platform.

Otherwise, you could always download the 756-page PDF reference and learn what you need to know about the file format in order to manipulate it yourself in any programming language. I don't think annotating a PDF in the way you specify should be that difficult. See section 7.5.6 - "Incremental Update", which discusses how to update a PDF file without having to rewrite the entire file and indexes. The hardest part is usually maintaining the correct object offsets in the cross-reference table.

[capr]

I am not sure if this is exactly what you are looking for but there is a program called pdf annotator http://www.ograhl.com/en/pdfannotator/

it works well for me when i use my tablet to make notes on prof. pre made pdfs at school so it might have some more advanced features for you.

[boogerjones]

rashid: the OP clearly intends to do this programmatically. He already found a program (Pegasus) that does what he wants.