Indigo
#4B0082
| HEX | #4B0082 |
|---|---|
| RGB | 75, 0, 130 |
| HSL | 275°, 100%, 25% |
| CMYK | 42%, 100%, 0%, 49% |
| Relative luminance | 0.03 |
Text contrast
On white
12.95:1 Passes AA
On black
1.62:1 Below AA
Colours that work with it
Complement
Analogous
Triadic
Shade scale
Seen with colour blindness
How to read this
- A hex code writes red, green and blue as two hexadecimal digits each. #ff0000 is red at full strength and the others at zero.
- HSL states hue (0–360°), saturation and lightness. Nudging a colour brighter means changing one number, which is why it is easier to work with by hand.
- Text contrast follows WCAG. Body-size text needs 4.5:1 or better, and 21:1 between white and black is the maximum possible.
- The colour-blindness row computes how this colour appears under three types of colour vision deficiency — the reason never to encode information in colour alone.
Frequently asked questions
Q. What is the hex code for Indigo?
#4B0082. That is 75, 0, 130 in RGB, and hue 275°, saturation 100%, lightness 25% in HSL.
Q. Should text on Indigo be white or black?
White. Contrast against white is 12.95:1 and against black 1.62:1, so take the higher one if body-size text has to be readable.
Q. What is the complement of Indigo?
#358000, sitting 180° across the colour wheel. Side by side the two push against each other hardest, which makes it a good accent but tiring over large areas.
Q. Can I send these CMYK values straight to print?
The computed values are C 42% · M 100% · Y 0% · K 49%. Real printing depends on paper and ink, so check against the printer's swatch book when the colour matters.
Q. Is this colour distinguishable with colour blindness?
It appears as #2B2A63 with protanopia, #2F355B with deuteranopia and #474A44 with tritanopia. Where those values converge with another colour, add a shape or a label instead of relying on hue.