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The first article of our PDF Optimization In-depth Series is available here. The PDF format is interactive. During the release cycle of a PDF document, different people will use tools such as forms, annotations, attachments, and more. Archived PDF documents generally do not have the same use as those in circulation in a collaborative context. […]
Don’t get your fingers burned with uncovered sensitive data Have you ever heard of PDF Redaction? If not, well either you don’t have sensitive content to hide, either you are doing it the wrong way. If yes, ask yourself: am I redacting my files properly? In this article, you will learn how to redact PDF […]
Here are the links for the two previous articles of the series: A PDF document is composed of various data structures, described as different objects. In the scope of optimization, one is particularly important: the stream object. This object aims to store binary data representing the content of an image, font file, color profile, embedded […]
This paper was originally a presentation in French delivered at the PDF Day – France by Loïc Carrère, CEO of ORPALIS, in April 2019. Organized by the PDF Association, the PDF days are the meeting place of the PDF industry, where experts conduct educational (non-commercial) presentations, panel, and discussion-based sessions about the format. The richness […]
Last October, the PDF Association held a series of webinars about various aspects of the PDF format. Our technical presentations covered PDF/A conversion and validation and the growing low code/no code ecosystem for PDF tools. Remote for the second year in a row, the PDF event hosted 24 technical conferences over the month of October. […]
We’re happy to announce our new PDFA validator, available with the latest release. Why is it important to validate PDF/A files? Long term archiving is a critical requirement for many industries. Because of the complexity of PDF document format, it is very important to validate if all the PDF/A specification requirements are met. To be […]
Communicating ideas in digital documents can often be made much clearer through the use of layers. Layers have been supported in PDF documents since version 1.5 through optional content groups (OCGs), also known as PDF layers. “Optional” is key here. OCGs allow us to group images or annotations together, then control their visibility based on […]
Previously in the PDf Optimization In-depth Series. Resizing images Resizing images can provide significant gains in occupancy. For example, decreasing unnecessary high resolutions can dramatically reduce the file size without affecting the viewing experience. But sometimes it is also a pretty destructive approach. There exist many sophisticated resizing algorithms, but it is rare to obtain […]
Previously in our PDF Optimization In-depth Series: MRC compression in PDF documents is highly efficient in file size reduction without visible degradation of document rendering. MRC, also known as hyper-compression, is an image compression benefiting from image segmentation methods. It is particularly useful for images containing text and continuous-tone graphics. This method reduces the size […]
Previously published in the PDf Optimization In-depth Series: Sometimes, when acceptable or necessary, it may be interesting to recompress images already included in an existing PDF file to reduce the file size. The PDF specification allows for seven compression schemes for such purposes. All of them can be used to compress images. Among these different […]
