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Recognised as Colour

#21803B

  • #21803B
  • Green
  • Dark
  • Nearest: Sea green

#21803B is a green with RGB values 33, 128, 59 and HSL 136°, 59%, 32%. It is a dark colour, so white text on it reaches 5:1 contrast (AA for normal text). The nearest named colour is Sea green.

Colour values

#21803B#21803B
HEX#21803B
RGBrgb(33, 128, 59)
RGB (0–1)0.1294, 0.502, 0.2314
RGB percentages12.9%, 50.2%, 23.1%
HSLhsl(136.4, 59%, 31.6%)
HSV / HSBhsv(136.4, 74.2%, 50.2%)
CMYK74.2%, 0%, 53.9%, 49.8%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,195,515
CSS custom property--colour: #21803B;

Brightness & contrast

Relative luminance0.16077WCAG 2.x, 0 is black and 1 is white
Perceived brightness101.7 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 4.98:1
Contrast with white4.98:1WCAG normal text: AA
Contrast with black4.22:1WCAG normal text: Fail
Greyscale equivalent#676767
Inverted#DE7FC4

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#817435no red cones; affects about 1% of men; ΔE 39.9 from the original
Deuteranopia#766D40no green cones; the most common form, about 1% of men; ΔE 39.6 from the original
Tritanopia#007D70no blue cones; rare, and affects men and women equally; ΔE 32.5 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text4.98:1WCAG large text: AAA
Contrast with black, large text4.22:1WCAG large text: AA

Named colours

Sea green · ΔE 11Dark green · ΔE 16.4Forest green · ΔE 17.2Medium seagreen · ΔE 19.7Green · ΔE 22.2Dark olivegreen · ΔE 24.5
Nearest named CSS colourSea green (#2E8B57)ΔE 10.96, a distinctly different colour
Hue familygreen
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#802166
Analogous#368021, #21806B
Triadic#3B2180, #803B21
Split complementary#6A2180, #802137
Tetradic#213680, #802166, #806B21

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#8CE1A3
Lighter +30%#63D783
Lighter +20%#3BCC63
Lighter +10%#2BA94E
Darker −10%#175728
Darker −20%#0C2F16
Darker −30%#020603
Darker −40%#000000
More saturated +25%#0D9432
Less saturated −25%#356C44

Channel breakdown

R33
G128
B59
Red33 (12.9%)
Green128 (50.2%)
Blue59 (23.1%)
Hue136.42°
Saturation (HSL)59.01%
Lightness31.57%
Dominant channelGreen
Hex per channelR 21 · G 80 · B 3B

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Every value on this page was computed from “21803b” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.