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Recognised as Colour

#21B451

  • #21B451
  • Green
  • Dark
  • Nearest: Forest green

#21B451 is a green with RGB values 33, 180, 81 and HSL 140°, 69%, 42%. It is a dark colour, so black text on it reaches 7.7:1 contrast (AAA for normal text). The nearest named colour is Forest green.

Colour values

#21B451#21B451
HEX#21B451
RGBrgb(33, 180, 81)
RGB (0–1)0.1294, 0.7059, 0.3176
RGB percentages12.9%, 70.6%, 31.8%
HSLhsl(139.6, 69%, 41.8%)
HSV / HSBhsv(139.6, 81.7%, 70.6%)
CMYK81.7%, 0%, 55%, 29.4%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,208,849
CSS custom property--colour: #21B451;

Brightness & contrast

Relative luminance0.3356WCAG 2.x, 0 is black and 1 is white
Perceived brightness141.7 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 7.71:1
Contrast with white2.72:1WCAG normal text: Fail
Contrast with black7.71:1WCAG normal text: AAA
Greyscale equivalent#8E8E8E
Inverted#DE4BAE

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#B6A448no red cones; affects about 1% of men; ΔE 54.1 from the original
Deuteranopia#A69859no green cones; the most common form, about 1% of men; ΔE 54.5 from the original
Tritanopia#00B09Eno blue cones; rare, and affects men and women equally; ΔE 44.4 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text2.72:1WCAG large text: Fail
Contrast with black, large text7.71:1WCAG large text: AAA

Named colours

Forest green · ΔE 17.2Medium seagreen · ΔE 18.4Green · ΔE 21.9Limegreen · ΔE 24.8Light green · ΔE 25Medium spring green · ΔE 27
Nearest named CSS colourForest green (#228B22)ΔE 17.19, a distinctly different colour
Hue familygreen
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#B42184
Analogous#3BB421, #21B49A
Triadic#5121B4, #B45121
Split complementary#9A21B4, #B4213B
Tetradic#213BB4, #B42184, #B49A21

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#B0F1C5
Lighter +30%#85E9A6
Lighter +20%#5AE186
Lighter +10%#2FD967
Darker −10%#19893E
Darker −20%#115E2A
Darker −30%#093317
Darker −40%#010803
More saturated +25%#06CF48
Less saturated −25%#3C995A

Channel breakdown

R33
G180
B81
Red33 (12.9%)
Green180 (70.6%)
Blue81 (31.8%)
Hue139.59°
Saturation (HSL)69.01%
Lightness41.76%
Dominant channelGreen
Hex per channelR 21 · G B4 · B 51

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Every value on this page was computed from “21b451” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.