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.

Pdf 1.3 Vs Pdf 1.4 Free
Pdf 1.3 Vs Pdf 1.4
Pdf 1.3 Vs Pdf 1.4 Download

Answer: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 Ghost Script!). The header looks like this in PDF 1.1: %PDF-1.1 In PDF 1.4,
it looks like this: %PDF-1.4 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:

Pdf 1.3 Vs Pdf 1.4 Free

#define PDFHEADERSIZE 1024
bool ChangeFileToNewPdfVersion(char *file)
{
char *replacePoint = NULL;
FILE *fp = fopen(file, 'rw');
char buf[PDFHEADERSIZE + 1];
buf[PDFHEADERSIZE] = '0';
if (fread(buf, 1, PDFHEADERSIZE, fp) != PDFHEADERSIZE) { fclose(fp); return false; }
fseek(fp, 0, SEEK_SET);
if ((replacePoint = strstr(buf, '%PDF-1.1')) NULL) { fclose(fp); return false; }
replacePoint[7] = '4';
if (fwrite(buf, 1, PDFHEADERSIZE, fp) != PDFHEADERSIZE) { fclose(fp); return false; }
fflush(fp);
fclose(fp);
return;
}

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. Actually if you feel this is a little complicated, you can use software VeryPDFPDF Editor can help you change PDF version directly through software interface. Please check details from the following snapshot.

1.3.1.4 Other Types of Sharing Arrangements 1.3.1.5 Determination of Accounting and Reporting Treatment for SSAs 1.3.2 Food Service Operations. 1.2 Introduction to PDF 1.4 Features 4 1.3 Related Publications 5 1.4 Intellectual Property 6 Chapter 2: Overview 9 2.1 Imaging Model 10 2.2 Other General Properties 14 2.3 Using PDF 19 2.4 PDF and the PostScript Language 21 Chapter 3: Syntax 23 3.1 Lexical Conventions 24 3.2 Objects 27 3.3 Filters 41 3.4 File Structure 61 3.5 Encryption 71.

If you need to use the command line version, please choose the PDF Editor OCX Control (ActiveX). During the using, if you have any question, please contact us as soon as possible.

VN:F [1.9.20_1166]

VN:F [1.9.20_1166]

Random Posts

PDF/A is targeted at reliable long-time preservation of digital documents with text, raster images and vector graphics as well as associated metadata. The PDF/A format specified in the ISO 19005 standard series defines a consistent and robust subset of PDF which can faithfully be reproduced even after a long archiving period, or used for reliable data exchange in enterprise and government environments. The major technical aspects of PDF/A-1, PDF/A-2, PDF/A-3 and PDF/A-4 will be discussed below.

PDF/A-1

PDF/A-1, the first standard within a series of multiple parts, has been published in 2005 as ISO 19005-1. It is based on PDF 1.4, the file format of Acrobat 5, and imposes some restrictions regarding the use of color, fonts, annotations, and other elements. There are two flavors of PDF/A-1 (called conformance levels):

Level B conformance (PDF/A-1b; »b« as in »basic«) ensures that the visual appearance of a document is preservable in the long term. PDF/A-1b ensures that the document will look the same when it is viewed or printed in the near or far future.
Level A conformance (PDF/A-1a; »a« as in »accessible«) is based on level B, but adds crucial properties of Tagged PDF: It requires structure information and reliable Unicode text semantics in order to preserve the document’s logical structure and natural reading order. Simply put, PDF/A-1a not only ensures that the document will look the same when it is used in the future, but also that its contents can be interpreted reliably and will be accessible to physically impaired users. As an important example, screenreader programs can read Tagged PDF documents to blind users.

PDF/A-2

PDF 1.7, the file format of Acrobat 8, has been standardized as ISO 32000-1 in 2008. In order to make new PDF features available in PDF/A, a new part of the standard called PDF/A-2 has been published in 2011 as ISO 19005-2.

PDF/A-2 is based on PDF 1.7 and includes many additions which are not available in PDF/A-1. These include important file format aspects such as JPEG 2000 compression, optional content (layers), PDF packages and others. PDF/A-2 documents may contain file attachments provided the attached documents themselves conform to PDF/A-1 or PDF/A-2.

Similar to PDF/A-1, PDF/A-2 offers level B and level A conformance. It adds another flavor called level U conformance. Level U sits in between PDF/A-2a and PDF/A-2b in that it requires reliable Unicode semantics, but not structure information. PDF/A-2u guarantees that the visual appearance of pages can be reproduced faithfully and that the text can be extracted and searched.

PDF/A-2 does not make PDF/A-1 obsolete or force users to migrate to the newer part of the standard - after all, this would be absurd for a standard which is targeted at long-term preservation.

PDF/A-3

Another part of the standard called PDF/A-3 has been published in 2012 as ISO 19005-3. PDF/A-3 is quite similar to PDF/A-2 and also supports conformance levels A, B, and U. It differs from PDF/A-2 in the following aspects:

While PDF/A-2 allows only file attachments which conform to PDF/A, PDF/A-3 allows arbitrary file types as attachments to meet the requirements of various use cases.
File attachments are associated with the whole document, a page, or some other part of the document. The kind of relationship between an attached file and the corresponding part of the document must be specified explicitly, e.g. source, alternative, or supplemental data. For each file attachment its relationship to some part of the document must be specified with the AFRelationship key.

Typical PDF/A-3 scenarios include embedding of word processor or spreadsheet source files in a finalform PDF/A document, or the inclusion of machine-readable XML data in a PDF intended for human consumption, e.g. an invoice. In fact, the ZUGFeRD and Factur-X invoice standards are an important application of PDF/A-3.

PDF/A-4

PDF/A-4 has been published in 2020 as ISO 19005-4. Since it is based on PDF 2.0 (published as ISO 32000-2 in 2017 and updated in 2020) it can take advantage of new PDF features. While PDF/A-2 and PDF/A-3 each comprise three different conformance levels which tended to confuse users, PDF/A-4 simplifies things since PDF/A-4 documents may or may not contain tags. Unlike previous parts of the standard no dedicated conformance level is required for tagged PDF/A-4 documents, thus eliminating the previous A/B/U conformance levels. Similarly, PDF/A-4 documents may or may not contain file attachments. The attached files must conform to PDF/A-1, PDF/A-2 or PDF/A-4.