Color contrast checker

1. How do you determine contrast color?
2. How can I check my contrast color online?
3. How do I check the contrast of an image?

How do you determine contrast color?

Calculating a Contrast Ratio

Contrast ratios can range from 1 to 21 (commonly written 1:1 to 21:1). (L1 + 0.05) / (L2 + 0.05), whereby: L1 is the relative luminance of the lighter of the colors, and. L2 is the relative luminance of the darker of the colors.

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.