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Recognised as Colour

#283F4A

  • #283F4A
  • Cyan
  • Dark
  • Nearest: Dark slate grey

#283F4A is a cyan with RGB values 40, 63, 74 and HSL 199°, 30%, 22%. It is a dark colour, so white text on it reaches 11.1:1 contrast (AAA for normal text). The nearest named colour is Dark slate grey.

Colour values

#283F4A#283F4A
HEX#283F4A
RGBrgb(40, 63, 74)
RGB (0–1)0.1569, 0.2471, 0.2902
RGB percentages15.7%, 24.7%, 29%
HSLhsl(199.4, 29.8%, 22.4%)
HSV / HSBhsv(199.4, 45.9%, 29%)
CMYK45.9%, 14.9%, 0%, 71%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,637,642
CSS custom property--colour: #283F4A;

Brightness & contrast

Relative luminance0.04501WCAG 2.x, 0 is black and 1 is white
Perceived brightness58.6 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 11.05:1
Contrast with white11.05:1WCAG normal text: AAA
Contrast with black1.9:1WCAG normal text: Fail
Greyscale equivalent#3B3B3B
Inverted#D7C0B5

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#393E4Bno red cones; affects about 1% of men; ΔE 7 from the original
Deuteranopia#343A4Ano green cones; the most common form, about 1% of men; ΔE 7.5 from the original
Tritanopia#1A4242no blue cones; rare, and affects men and women equally; ΔE 9.9 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text11.05:1WCAG large text: AAA
Contrast with black, large text1.9:1WCAG large text: Fail

Named colours

Dark slate grey · ΔE 10.4Dim grey · ΔE 22.1Black · ΔE 27.6Slate grey · ΔE 27.8Gray · ΔE 30.4Light slate grey · ΔE 30.9
Nearest named CSS colourDark slate grey (#2F4F4F)ΔE 10.36, a distinctly different colour
Hue familycyan
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#4A3328
Analogous#284A44, #282E4A
Triadic#4A283F, #3F4A28
Split complementary#4A282E, #4A4428
Tetradic#44284A, #4A3328, #2E4A28

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#82A9BC
Lighter +30%#6192AA
Lighter +20%#4C778C
Lighter +10%#3A5B6B
Darker −10%#162329
Darker −20%#040708
Darker −30%#000000
Darker −40%#000000
More saturated +25%#1A4458
Less saturated −25%#363A3C

Channel breakdown

R40
G63
B74
Red40 (15.7%)
Green63 (24.7%)
Blue74 (29%)
Hue199.41°
Saturation (HSL)29.82%
Lightness22.35%
Dominant channelBlue
Hex per channelR 28 · G 3F · B 4A

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Every value on this page was computed from “283f4a” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.