There are two ways to make an infographic accessible:
- By providing a text alternative for the infographic that conveys the same meaning and information that is represented visually.
- By using HTML/CSS to create your infographic rather than using an image file.
No matter which method you choose, colours used in the infographic must meet colour contrast requirements.
http://www.accessiq.org/create/content/how-to-create-an-accessible-infographic