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Recognised as Colour

#638F55

  • #638F55
  • Green
  • Dark
  • Nearest: Sea green

#638F55 is a green with RGB values 99, 143, 85 and HSL 106°, 25%, 45%. It is a dark colour, so black text on it reaches 5.6:1 contrast (AA for normal text). The nearest named colour is Sea green.

Colour values

#638F55#638F55
HEX#638F55
RGBrgb(99, 143, 85)
RGB (0–1)0.3882, 0.5608, 0.3333
RGB percentages38.8%, 56.1%, 33.3%
HSLhsl(105.5, 25.4%, 44.7%)
HSV / HSBhsv(105.5, 40.6%, 56.1%)
CMYK30.8%, 0%, 40.6%, 43.9%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer6,524,757
CSS custom property--colour: #638F55;

Brightness & contrast

Relative luminance0.22953WCAG 2.x, 0 is black and 1 is white
Perceived brightness125.5 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 5.59:1
Contrast with white3.76:1WCAG normal text: Fail
Contrast with black5.59:1WCAG normal text: AA
Greyscale equivalent#818181
Inverted#9C70AA

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#928651no red cones; affects about 1% of men; ΔE 23.7 from the original
Deuteranopia#8C8258no green cones; the most common form, about 1% of men; ΔE 23.9 from the original
Tritanopia#618B81no blue cones; rare, and affects men and women equally; ΔE 27.3 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text3.76:1WCAG large text: AA
Contrast with black, large text5.59:1WCAG large text: AAA

Named colours

Sea green · ΔE 14.9Dark olivegreen · ΔE 15.6Dark seagreen · ΔE 19.1Olivedrab · ΔE 23.6Medium seagreen · ΔE 24Dark khaki · ΔE 28.8
Nearest named CSS colourSea green (#2E8B57)ΔE 14.88, a distinctly different colour
Hue familygreen
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#81558F
Analogous#808F55, #558F64
Triadic#55638F, #8F5563
Split complementary#64558F, #8F5580
Tetradic#55808F, #81558F, #8F6455

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#D3E2CE
Lighter +30%#B6CFAE
Lighter +20%#99BC8E
Lighter +10%#7CA96E
Darker −10%#4D6F42
Darker −20%#374F2F
Darker −30%#212F1C
Darker −40%#0A0F09
More saturated +25%#54AB39
Less saturated −25%#727271

Channel breakdown

R99
G143
B85
Red99 (38.8%)
Green143 (56.1%)
Blue85 (33.3%)
Hue105.52°
Saturation (HSL)25.44%
Lightness44.71%
Dominant channelGreen
Hex per channelR 63 · G 8F · B 55

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Every value on this page was computed from “638f55” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.