Contrast

How to interpret wcag2.0 guidelines on contrast for buttons and icons

How to interpret wcag2.0 guidelines on contrast for buttons and icons
  1. What is the minimum color contrast that an icon should pass?
  2. What is an acceptable contrast ratio?
  3. How do you read contrast ratio colors?
  4. How is WCAG contrast calculated?

What is the minimum color contrast that an icon should pass?

The first test of the icon should be against the darkest (least contrasting) background that is adjacent to the icon color. If that is at least 3:1, it passes the success criterion.

What is an acceptable contrast ratio?

Color Contrast Ratios Guidance

Whenever using color in images, ensure that the colors have a contrast ratio of at least 4.5:1. This ensures that the text is still readable to those who may have color blindness.

How do you read contrast ratio colors?

Contrast ratios range from 1 to 21 (written as 1:1 and 21:1). The first number, L1, refers to the relative luminance of light colors while L2 is the second number that refers to the relative luminance of dark colors.

How is WCAG contrast calculated?

Contrast is calculated using "relative luminance", which is defined as: The relative brightness of any point in a colorspace, normalized to 0 for darkest black and 1 for lightest white. The relative luminance can be calculated from any colour code (like HEX or RGB).

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