The Princeton University Office of Accessibility provides accessibility testing, training, tools, and guidance on Digital Accessibility (https://digital.accessibility.princeton.edu/) including a "How to..." section (https://digital.accessibility.princeton.edu/how). Many journals have guidelines for accessibility of images and graphics. Here are some general best practices and links to publisher guidelines.
- Color considerations- need high enough contrast between the text and background
- Do not rely on color to relay meaning
- Provide a brief descriptive alternative text or "alt text".