How to find an accessible color by changing lightness only?

1. What is an accessible color?
2. What colors to avoid for accessibility?
3. When choosing Colours for accessible graphic design we should aim for?

What is an accessible color?

Making colors accessible means color combinations with enough contrast so the content is clearly distinguishable from the surrounding page.

What colors to avoid for accessibility?

Avoid red and black combinations. People who cannot detect red will confuse red and black, so the item will not be legible. Avoid red and green combinations. Approximately 5% of people cannot distinguish between red and green.

When choosing Colours for accessible graphic design we should aim for?

The basic accessibility guideline for color is to choose colors people can see. Being able to see text is a big factor in being able to read it and therefore understand it's meaning.