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Recognised as Colour

#4278AC

  • #4278AC
  • Blue
  • Dark
  • Nearest: Steel blue

#4278AC is a blue with RGB values 66, 120, 172 and HSL 209°, 45%, 47%. It is a dark colour, so white text on it reaches 4.7:1 contrast (AA for normal text). The nearest named colour is Steel blue.

Colour values

#4278AC#4278AC
HEX#4278AC
RGBrgb(66, 120, 172)
RGB (0–1)0.2588, 0.4706, 0.6745
RGB percentages25.9%, 47.1%, 67.5%
HSLhsl(209.4, 44.5%, 46.7%)
HSV / HSBhsv(209.4, 61.6%, 67.5%)
CMYK61.6%, 30.2%, 0%, 32.5%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer4,356,268
CSS custom property--colour: #4278AC;

Brightness & contrast

Relative luminance0.1757WCAG 2.x, 0 is black and 1 is white
Perceived brightness114.6 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 4.65:1
Contrast with white4.65:1WCAG normal text: AA
Contrast with black4.51:1WCAG normal text: AA
Greyscale equivalent#707070
Inverted#BD8753

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#627AAEno red cones; affects about 1% of men; ΔE 7.8 from the original
Deuteranopia#5470ABno green cones; the most common form, about 1% of men; ΔE 8.8 from the original
Tritanopia#00848Ano blue cones; rare, and affects men and women equally; ΔE 33.5 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text4.65:1WCAG large text: AAA
Contrast with black, large text4.51:1WCAG large text: AAA

Named colours

Steel blue · ΔE 4.4Slate grey · ΔE 22.8Light slate grey · ΔE 23Cornflower blue · ΔE 23.5Deep skyblue · ΔE 30Light skyblue · ΔE 32.4
Nearest named CSS colourSteel blue (#4682B4)ΔE 4.35, a close match
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#AC7642
Analogous#42ACAB, #4243AC
Triadic#AC4278, #78AC42
Split complementary#AC4243, #ACAB42
Tetradic#AB42AC, #AC7642, #43AC42

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#CEDDEC
Lighter +30%#A9C4DE
Lighter +20%#84ABD0
Lighter +10%#5F91C2
Darker −10%#345E87
Darker −20%#264562
Darker −30%#182B3D
Darker −40%#091119
More saturated +25%#2479CA
Less saturated −25%#60778E

Channel breakdown

R66
G120
B172
Red66 (25.9%)
Green120 (47.1%)
Blue172 (67.5%)
Hue209.43°
Saturation (HSL)44.54%
Lightness46.67%
Dominant channelBlue
Hex per channelR 42 · G 78 · B AC

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Every value on this page was computed from “4278ac” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.