Colours and Contrast
This tool computes the colour brightness difference and the colour difference between a background colour and a foreground colour.
You can specify colours in a number of ways:
- with 3-digit hexadecimal notation (RGB), e.g. #fc0
- with 6-digit hexadecimal notation (RRGGBB), e.g. #ffcc00
- with three decimal values (red, green, blue) in the 0–255 range, e.g. rgb(255,204,0)
- with three percentages (red, green, blue), e.g. rgb(100%,80%,0%)
People with certain types of vision impairment or colour-deficit vision may have difficulties reading text unless those differences are sufficiently large. The tool computes whether the differences between two specified colours are sufficient according to accepted standards.