Accessible PowerPoint (implementation guide)
The PowerPoint Accessibility Implementation Guide serves as support for the PowerPoint Accessibility Checklist. The order of the aspects and the structure according to categories are the same.
Each aspect is divided into three sections in the implementation guide:
Under the heading "What is meant by this?" you will find a detailed description of the aspect to be ticked off. The section "Why is it important?" describes which barriers you are removing with the respective aspect and for which groups of people this is essential. Finally, under the heading "How can I implement/check this?" you will find detailed instructions on how to implement or check the respective aspect.
7. Graphic
7.4. Minimum contrast of graphic elements
Graphic information-bearing elements (e.g. lines, neighbouring areas) have a minimum contrast of 3:1 to the background.
What is meant by this?
Graphic information-bearing elements are visual elements that convey information in a presentation. These include, for example, lines, neighbouring areas and other graphic "aids". If these are used in PowerPoint, they must have a minimum contrast of 3:1 to the background of the presentation. The minimum contrast refers to the ratio or difference in brightness or colour depth between the colours used in graphic elements and the background.
Why is it important?
For recipients with visual impairments, sufficient contrast between graphic elements and the background can be crucial for recognising them. Insufficient contrast makes it difficult to recognise and can lead to misinterpretation. It is therefore important that graphic elements such as images or buttons have a sufficient minimum contrast.
Sufficient contrast not only makes it easier for recipients with visual impairments to perceive content. Recipients who work in an environment with poor lighting conditions, have a printout in black and white or are watching a presentation via a projector also benefit from a high contrast ratio. Sufficient contrast ensures that the content is clearly recognisable, making it easier to absorb and process information.
How can I implement/check it?
There are various options in PowerPoint for realising a minimum contrast of 3:1:
- Use high-contrast colours: Select colours that have a high contrast to each other, e.g. black on white or yellow on black.
- Use the integrated colour schemes: PowerPoint offers a variety of integrated colour schemes that have been specially developed for good readability and contrast. These can be found under the "Design" menu item in the ribbon bar.
- To ensure that the contrast ratio between graphic information-bearing elements and the background is optimal, you can use online tools or downloadable programmes. These can automatically calculate the contrast ratio for you.
However, it is important to note that the minimum contrast of 3:1 is only the absolute minimum value and it is recommended to use a higher contrast, especially if the presentation is intended for recipients with visual impairments or reading difficulties.