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Annotate A PDF?


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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.

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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.

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