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Recognised as Colour

#284F55

  • #284F55
  • Cyan
  • Dark
  • Nearest: Dark slate grey

#284F55 is a cyan with RGB values 40, 79, 85 and HSL 188°, 36%, 25%. It is a dark colour, so white text on it reaches 9:1 contrast (AAA for normal text). The nearest named colour is Dark slate grey.

Colour values

#284F55#284F55
HEX#284F55
RGBrgb(40, 79, 85)
RGB (0–1)0.1569, 0.3098, 0.3333
RGB percentages15.7%, 31%, 33.3%
HSLhsl(188, 36%, 24.5%)
HSV / HSBhsv(188, 52.9%, 33.3%)
CMYK52.9%, 7.1%, 0%, 66.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,641,749
CSS custom property--colour: #284F55;

Brightness & contrast

Relative luminance0.06699WCAG 2.x, 0 is black and 1 is white
Perceived brightness70.5 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 8.98:1
Contrast with white8.98:1WCAG normal text: AAA
Contrast with black2.34:1WCAG normal text: Fail
Greyscale equivalent#474747
Inverted#D7B0AA

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#494C55no red cones; affects about 1% of men; ΔE 13 from the original
Deuteranopia#424755no green cones; the most common form, about 1% of men; ΔE 13.4 from the original
Tritanopia#0E5251no blue cones; rare, and affects men and women equally; ΔE 8.5 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text8.98:1WCAG large text: AAA
Contrast with black, large text2.34:1WCAG large text: Fail

Named colours

Dark slate grey · ΔE 4.1Dim grey · ΔE 19.5Slate grey · ΔE 24Teal · ΔE 24.1Gray · ΔE 26.6Light slate grey · ΔE 26.8
Nearest named CSS colourDark slate grey (#2F4F4F)ΔE 4.09, a close match
Hue familycyan
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#552E28
Analogous#285545, #283955
Triadic#55284F, #4F5528
Split complementary#552838, #554528
Tetradic#452855, #552E28, #395528

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#84BCC5
Lighter +30%#61AAB5
Lighter +20%#498F9A
Lighter +10%#386F78
Darker −10%#182F32
Darker −20%#070F10
Darker −30%#000000
Darker −40%#000000
More saturated +25%#185A65
Less saturated −25%#384445

Channel breakdown

R40
G79
B85
Red40 (15.7%)
Green79 (31%)
Blue85 (33.3%)
Hue188°
Saturation (HSL)36%
Lightness24.51%
Dominant channelBlue
Hex per channelR 28 · G 4F · B 55

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Every value on this page was computed from “284f55” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.