Accessible Video (implementation guide)

2.6. Contrasts

Contrasts are sufficiently high, especially for images (ratio is at least 4.5:1).

What is meant by this?

When creating videos, it is important to ensure that the contrasts are sufficiently high, especially for images. A sufficiently high contrast means that there is enough difference between the colours to enable clear visual differentiation.

If images are used, they must have a minimum contrast of 4.5:1 to the background.

Why is it important?

It is important to provide sufficiently high contrast in videos to facilitate approval of information for people who cannot clearly perceive all colours. High contrast enables these staff, people to better recognise and understand visual content.

How can I implement/check it?

To realise sufficiently high contrast in videos, you can take the following measures:

• Choose colour combinations where there is sufficient contrast between the background and text or images.
• Use light text colours on a dark background or dark text colours on a light background to achieve a clear contrast.
• Make sure that the contrast between the colours is clearly visible even with different screens and lighting conditions.
• Test the contrast by displaying the video on different devices and screens and making sure that the content is clearly visible.
• Consider contrast when using graphics or diagrams to ensure that the information is clearly recognisable for all users.

A contrast ratio tool can be used to check for sufficient contrast. There are various online tools or software that can be used to measure the ratio between the colours. The recommended ratio is 4.5:1. By comparing the contrast ratio with this standard value, you can check whether the contrasts are sufficiently high.