Connaissances PDF
Trouvez des articles qui vous donnent un aperçu pratique du monde des PDF. Apprenez tous les tenants et aboutissants des PDF, des principes fondamentaux aux méthodes les plus efficaces.
How to use
How to get started with the Conversion Service using Postman
Postman is a free-to-download tool for making HTTP requests. It can be used for testing and getting acquainted with any REST API such as the one offered by the 4-Heights® Conversion Service.
PDF standards
PDF Rendering 2.0 – nouvelle génération de moteur de rendu pour PDF
Un moteur de rendu de haute qualité est un élément essentiel de la conversion, de l’affichage et de l’impression. Quelle que soit la version PDF des documents, une reproduction fidèle à l’original et une bonne qualité d’ ...
PDF standards
Tout ce que vous devez savoir sur le PDF/A-4
Le PDF/A-4 a été publié à l’automne 2020 et constitue ainsi la partie la plus récente de la version normalisée PDF/A. Basé sur la norme ISO 32000-2 (PDF 2.0), il constitue à la fois un développement de PDF/A-3 reposant s ...
Tech corner
Controlling enveloping machines using OMR markers
In this new blog thread I'd like to inform you about new features and applications of our tools. Enveloping machines can be magically controlled with these tiny dashes called OMR markers on the border of a printed sheet. ...
Tech corner
PDF transparency reviewed
This new blog thread is dedicated to the development of the PDF standard and its associated sub-standards. As a delegate of the Swiss Standardization Association (SNV) in the ISO Comittee I'm supposed to review all relat ...
Tech corner
Stroking geometric paths - not as easy as it seems
In PDF geometric paths are simply described as lines and cubic bézier curves. The filling of a path is straight forward once one understands the even-odd and non-zero-winding rule. The stroking of a path however is not a ...
Tech corner
TIFF Mixed Raster Content (MRC) conforming to RFC 2301
Mixed Raster Content (MRC) is a process to reduce the size of raster images. It is well known since PDF/A is used to archive scanned documents. However, it has been used and standardized in RFC 2301 for TIFF files earlie ...
Tech corner
Embedding fonts in PDF
I collect bad PDFs since the Reference Manual 1.0 was published in 1993 and today I have recourse to a data base of more than 100'000 real world PDF files with all kinds of faults in them. The vast majority of problems, ...
Tech corner
Why is the extraction of text from a PDF document such a hassle
When I use a text editing tool such as Microsoft Word then it is quite natural that I can select a portion of text and copy it to the clipboard and paste it in to a window of any other tool. Not so with PDF. At least not ...
Tech corner
Splitting and merging pages of PDF documents
Single out pages from a number of input documents and re-arrange them in a set of output documents belongs to the daily routine in a document assembly application. At first glance, this seems to be a clear and understand ...
Tech corner
What is PDF optimization?
Most people agree that PDF optimization has something to do with reducing file size. Sometimes it's about faster rendering. Anyway, optimization is a wide topic and it's certainly worth a closer look.
Tech corner
The discipline of converting PDF to PDF/A
We all know that the conversion one file format to another is not as easy as one might wish for and can lead to unpleasant surprises. However, it is hardly known that this is the case for the conversion from PDF to PDF/A ...
Tech corner
Can I trust PDF validation software?
If I use validation software from different manufacturers I sometimes get different results. Why can this happen? Does it mean that I can't trust the software? What can I do about it? I hear these and more questions very ...
Tech corner
Automating the conversion of Microsoft Office Documents to PDF/A
A central service to convert Microsoft Office documents to PDF or PDF/A has obvious advantages. The conversion is done on an enterprise wide platform with well defined software versions and conversion process configurati ...