Pdf Version 1.4
- This document describes Version 1.4 of the SDI-12 standard. Version 1.4 is an upgrade from Version 1.3, dated January 28, 2016. The purpose of this document is to describe SDI-12 in detail and to provide examples of all SDI-12 commands and responses. (See appendix D for a list of upgrades made since Version 1.0.).
- In this article, we will see code snippets that illustrate the ease with which you can change the PDF version of a PDF document. The code snippet shows how to convert a PDF document from old version (e.g.1.4) to newer (e.g.1.6).
- PDF (from version 1.4) supports graphic transparency; PostScript does not. PostScript is an interpreted programming language with an implicit global state, so instructions accompanying the description of one page can affect the appearance of any following page. Therefore, all preceding pages in a PostScript document must be processed to.
How do I save a.pdf to a lower revision level. For your PDF files you want to configure a Distiller job option to output a PDF version 1.4 (Acrobat 5.x). PDF Version Converter is the answer. This software utility enables you to convert PDF files between different versions; you can upgrade or downgrade PDF version among, PDF version 1.0 (Adobe. Question: How can I convert PDF files from version 1.1 to 1.4 (or higher)? Actually I need some sort of command line tool for batch converting or some API to be able to convert dynamically sever all documents.
Convert Pdf Version 1.4 To 1.7
How can I convert pdf files from version 1.1 to 1.4 (or higher)?
Actually I need some sort of command line tool for batch converting or some API to be able to convert dynamically severall documents.
2 Answers
Pdf 1.1 is forward compatible with pdf 1.4. Everything in pdf 1.1 will work with pdf 1.4 - it's guaranteed by the spec. Let's assume that you've got some justifiable reason why this is not good enough for you (let's assume, for example, that you have a non-spec compliant tool that consumes PDF and explodes on any file version less that 1.4).
We can focus on the main syntactic differences between versions.
All PDF files have a header somewhere in the first 1024 bytes. In most cases, it's the very first line, but that's not guaranteed (I'm looking at you GhostScript!). The header looks like this in PDF 1.1:
in PDF 1.4, it looks like this:
So in theory, all you need is a tool that will look in the first 1024 bytes for a file for '%PDF-1.1' and change it to '%PDF-1.4'. You could use sed, perl, etc to do something like that for you. You could write it in C and you would be tempted to do something like this:
Adobe Version 1.4
which will work in most sane cases. It will not work if the file starts, for example, with 0 bytes, which would serve as null terminators in the block of data.
A better choice (really) would be to cobble up a simple state machine to find %PDF-1. by reading 1 byte at a time until it either finds it or passes 1017 (1024 less the header length), then reads the next byte, if it's a '1', it seeks back a byte and writes a '4'.
The only other thing you would need to worry about is that PDF 1.4 suggests that the document catalog should contain a Version key with the file version. Since this is defined as optional in the spec, you are safe to ignore it.
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So this will solve your problem. I do not, however, believe that you should need to do this. Really.
You should take some time to read part of the PDF spec, specifically section I.2 about version numbers and compatibility.
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