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About the contributor
PDF Association

Mission Statement: To promote Open Standards-based electronic document implementations using PDF technology through education, expertise and shared experience for stakeholders worldwide.
More contributions
Interview with René Treuber, Product Manager of axaio software, about PDF Days Europe 2018

René Treuber, Product Manager of axaio software, will be hosting a presentation titled “Introducing ISO standards for PDF “processing steps” and “print product metadata”” at the PDF Days Europe 2018. In this Interview he gives some background information about it.

Interview with Roman Toda, CTO of Normex, about PDF Days Europe 2018

Roman Toda, CTO of Normex, will be hosting a presentation titled “Encryption with PDF 2.0” at the PDF Days Europe 2018. In this interview he gives some background information about it.

PANEL “Five visions of a PDF future” at the PDF Days Europe 2018

Catherine Andersz (PDFTron), Richard Cohn (Adobe), Harald Grumser (Compart), Carsten Heiermann (Foxit) and Duff Johnson (PDF Association) present their ideas for the next 25 years of PDF.

Interview with Dietrich von Seggern, CEO of callas software, about PDF Days Europe 2018

Dietrich von Seggern, CEO of callas software, will be hosting a presentation titled “Text and fonts in PDF” at the PDF Days Europe 2018. In this Interview he gives some background information about it.

Interview with Ulrich Isermeyer, Sr. Business Development Manager, Adobe Systems GmbH, about PDF Days Europe 2018

Ulrich Isermeyer, Sr. Business Development Manager, Adobe Systems GmbH, will be hosting a presentation titled “The power of 3D PDF” at the PDF Days Europe 2018. In this Interview he gives some background information about it.

Added value for PDF users


The PDF/UA framework allows assistive technology, PDF applications and the PDF file format to work together optimally so that as many people as possible have access to PDF documents with sound technical support. Disabled users will see the most significant benefits, as they often use a range of assistive technologies to help them access digital content which their disability would otherwise render inaccessible.

Visual or motor impairments

For example, partially-sighted users, depending on the degree of their impairment, may use a larger screen, customised colour and text size settings, or an intelligent screen magnifier. Blind users, or those with particularly severe visual impairments, may use a so-called screen reader (using text-to-speech) and/or a Braille display in order to read PDF documents. A screen reader is a program installed on the user’s computer which reads all visible content aloud. A Braille display is a haptic interface for the same content; it outputs text using raised, moving Braille dots.

A user with restricted arm or hand mobility may use a range of assistive technology to navigate and make use of a PDF document. Instead of a classical computer mouse, they may use a specialist mouse or keyboard, or an onscreen keyboard. Depending on the degree and nature of their disability and their own aptitude, the user may also have other input options, such as special sensors, switches and/or key combinations, or enlargement options. The user can also give spoken commands to speech recognition software or use eye movements and a gaze-tracking system to control their computer.

Reading and writing difficulties

Dyslexic users find it unusually difficult to learn to read. They find it difficult to recognise and process written text. Assistive technologies such as specialised screen readers can help them overcome this. These read content aloud and highlight the same section of text on the screen. This gives the reader a cue, facilitates comprehension and helps them to improve their reading skills and master written language.

Easier reading and navigation on mobile devices

PDF/UA specifies the technical requirements for assistive technology to fully interact with PDF documents using PDF/UA-compliant PDF software. As long as the assistive technology and PDF software used is fully compliant with the standard, the result for disabled users is a high-quality reading and navigational experience. The standard will also benefit other users, however; anyone who reads documents on mobile devices, for example, will appreciate PDF content automatically adjusting itself to a reader-friendly size without affecting the semantic structure.

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Tags: Color, assistive technology, braille, contrast, screen reader
Categories: PDF/UA