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Recognised as Colour

#21887C

  • #21887C
  • Cyan
  • Dark
  • Nearest: Dark cyan

#21887C is a cyan with RGB values 33, 136, 124 and HSL 173°, 61%, 33%. It is a dark colour, so black text on it reaches 4.9:1 contrast (AA for normal text). The nearest named colour is Dark cyan.

Colour values

#21887C#21887C
HEX#21887C
RGBrgb(33, 136, 124)
RGB (0–1)0.1294, 0.5333, 0.4863
RGB percentages12.9%, 53.3%, 48.6%
HSLhsl(173, 60.9%, 33.1%)
HSV / HSBhsv(173, 75.7%, 53.3%)
CMYK75.7%, 0%, 8.8%, 46.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,197,628
CSS custom property--colour: #21887C;

Brightness & contrast

Relative luminance0.19387WCAG 2.x, 0 is black and 1 is white
Perceived brightness113.7 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 4.88:1
Contrast with white4.31:1WCAG normal text: Fail
Contrast with black4.88:1WCAG normal text: AA
Greyscale equivalent#717171
Inverted#DE7783

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#81807Cno red cones; affects about 1% of men; ΔE 31.3 from the original
Deuteranopia#73757Dno green cones; the most common form, about 1% of men; ΔE 32.4 from the original
Tritanopia#008B84no blue cones; rare, and affects men and women equally; ΔE 3.9 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text4.31:1WCAG large text: AA
Contrast with black, large text4.88:1WCAG large text: AAA

Named colours

Dark cyan · ΔE 7.3Teal · ΔE 7.7Cadetblue · ΔE 16.3Light seagreen · ΔE 16.5Sea green · ΔE 23.4Medium turquoise · ΔE 27.2
Nearest named CSS colourDark cyan (#008B8B)ΔE 7.29, clearly different but related
Hue familycyan
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#88212D
Analogous#218849, #216088
Triadic#7C2188, #887C21
Split complementary#882160, #884921
Tetradic#492188, #88212D, #608821

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#91E4DB
Lighter +30%#68DACD
Lighter +20%#3FD0BF
Lighter +10%#2BB1A1
Darker −10%#175F57
Darker −20%#0D3631
Darker −30%#030D0C
Darker −40%#000000
More saturated +25%#0C9D8C
Less saturated −25%#36736C

Channel breakdown

R33
G136
B124
Red33 (12.9%)
Green136 (53.3%)
Blue124 (48.6%)
Hue173.01°
Saturation (HSL)60.95%
Lightness33.14%
Dominant channelGreen
Hex per channelR 21 · G 88 · B 7C

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Every value on this page was computed from “21887c” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.