Contrast ratio checker

1. How do I find my contrast ratio?
2. What is a color contrast ratio of 4.5 1?
3. How can I check my contrast color online?
4. How do I check the contrast of an image?

How do I find my contrast ratio?

The Contrast Checker from WebAIM is an online tool to test the contrast ratio. All you have to do is enter the hexadecimal codes of the text and background colors. Then you get the contrast ratio and see if the contrast is sufficient for WCAG levels AA or AAA.

What is a color contrast ratio of 4.5 1?

The 4.5:1 ratio is used in this provision to account for the loss in contrast that results from moderately low visual acuity, congenital or acquired color deficiencies, or the loss of contrast sensitivity that typically accompanies aging.

How can I check my contrast color online?

Explanation. Enter a foreground and background color in RGB hexadecimal format (e.g., #FD3 or #F7DA39) or choose a color using the color picker. The Lightness slider can be used to adjust the selected color. WCAG 2.0 level AA requires a contrast ratio of at least 4.5:1 for normal text and 3:1 for large text.

How do I check the contrast of an image?

Contrast is defined as the difference between the highest and lowest intensity value of the image. So you can easily calculate it from the respective histogram. Example: If you have a plain white image, the lowest and highest value are both 255, thus the contrast is 255-255=0.