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Recognised as Colour

#637F31

  • #637F31
  • Green
  • Dark
  • Nearest: Dark olivegreen

#637F31 is a green with RGB values 99, 127, 49 and HSL 82°, 44%, 35%. It is a dark colour, so black text on it reaches 4.6:1 contrast (AA for normal text). The nearest named colour is Dark olivegreen.

Colour values

#637F31#637F31
HEX#637F31
RGBrgb(99, 127, 49)
RGB (0–1)0.3882, 0.498, 0.1922
RGB percentages38.8%, 49.8%, 19.2%
HSLhsl(81.5, 44.3%, 34.5%)
HSV / HSBhsv(81.5, 61.4%, 49.8%)
CMYK22%, 0%, 61.4%, 50.2%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer6,520,625
CSS custom property--colour: #637F31;

Brightness & contrast

Relative luminance0.18053WCAG 2.x, 0 is black and 1 is white
Perceived brightness112.6 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 4.61:1
Contrast with white4.55:1WCAG normal text: AA
Contrast with black4.61:1WCAG normal text: AA
Greyscale equivalent#737373
Inverted#9C80CE

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#857728no red cones; affects about 1% of men; ΔE 19.6 from the original
Deuteranopia#827536no green cones; the most common form, about 1% of men; ΔE 19.7 from the original
Tritanopia#67796Eno blue cones; rare, and affects men and women equally; ΔE 37.2 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text4.55:1WCAG large text: AAA
Contrast with black, large text4.61:1WCAG large text: AAA

Named colours

Dark olivegreen · ΔE 11.4Olivedrab · ΔE 13.5Olive · ΔE 21.1Dark green · ΔE 24.6Sea green · ΔE 24.7Forest green · ΔE 27.4
Nearest named CSS colourDark olivegreen (#556B2F)ΔE 11.42, a distinctly different colour
Hue familygreen
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#4D317F
Analogous#7F7431, #3C7F31
Triadic#31637F, #7F3163
Split complementary#313C7F, #74317F
Tetradic#317F74, #4D317F, #7F313C

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#C6DBA1
Lighter +30%#B0CD7C
Lighter +20%#99BE58
Lighter +10%#80A43F
Darker −10%#465A23
Darker −20%#2A3515
Darker −30%#0D1106
Darker −40%#000000
More saturated +25%#69951B
Less saturated −25%#5D6947

Channel breakdown

R99
G127
B49
Red99 (38.8%)
Green127 (49.8%)
Blue49 (19.2%)
Hue81.54°
Saturation (HSL)44.32%
Lightness34.51%
Dominant channelGreen
Hex per channelR 63 · G 7F · B 31

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Every value on this page was computed from “637f31” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.