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Colour

#28404B

  • #28404B
  • Cyan
  • Dark
  • Nearest: Dark slate grey

#28404B is a cyan with RGB values 40, 64, 75 and HSL 199°, 30%, 23%. It is a dark colour, so white text on it reaches 10.9:1 contrast (AAA for normal text). The nearest named colour is Dark slate grey.

Colour values

#28404B#28404B
HEX#28404B
RGBrgb(40, 64, 75)
RGB (0–1)0.1569, 0.251, 0.2941
RGB percentages15.7%, 25.1%, 29.4%
HSLhsl(198.9, 30.4%, 22.5%)
HSV / HSBhsv(198.9, 46.7%, 29.4%)
CMYK46.7%, 14.7%, 0%, 70.6%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,637,899
CSS custom property--colour: #28404B;

Brightness & contrast

Relative luminance0.04626WCAG 2.x, 0 is black and 1 is white
Perceived brightness59.4 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 10.91:1
Contrast with white10.91:1WCAG normal text: AAA
Contrast with black1.93:1WCAG normal text: Fail
Greyscale equivalent#3C3C3C
Inverted#D7BFB4

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#3A3F4Cno red cones; affects about 1% of men; ΔE 7.3 from the original
Deuteranopia#353B4Bno green cones; the most common form, about 1% of men; ΔE 7.8 from the original
Tritanopia#1A4343no blue cones; rare, and affects men and women equally; ΔE 9.8 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text10.91:1WCAG large text: AAA
Contrast with black, large text1.93:1WCAG large text: Fail

Named colours

Dark slate grey · ΔE 10Dim grey · ΔE 21.9Slate grey · ΔE 27.5Black · ΔE 28Gray · ΔE 30.1Light slate grey · ΔE 30.5
Nearest named CSS colourDark slate grey (#2F4F4F)ΔE 10, a distinctly different colour
Hue familycyan
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#4B3328
Analogous#284B45, #282E4B
Triadic#4B2840, #404B28
Split complementary#4B282E, #4B4528
Tetradic#45284B, #4B3328, #2E4B28

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#82AABD
Lighter +30%#6194AB
Lighter +20%#4B798E
Lighter +10%#3A5C6C
Darker −10%#16242A
Darker −20%#050708
Darker −30%#000000
Darker −40%#000000
More saturated +25%#1A4559
Less saturated −25%#363B3D

Channel breakdown

R40
G64
B75
Red40 (15.7%)
Green64 (25.1%)
Blue75 (29.4%)
Hue198.86°
Saturation (HSL)30.43%
Lightness22.55%
Dominant channelBlue
Hex per channelR 28 · G 40 · B 4B

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Every value on this page was computed from “28404b” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.