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Recognised as Colour

#042251

  • #042251
  • Blue
  • Dark
  • Nearest: Dark slateblue

#042251 is a blue with RGB values 4, 34, 81 and HSL 217°, 91%, 17%. It is a dark colour, so white text on it reaches 15.5:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#042251#042251
HEX#042251
RGBrgb(4, 34, 81)
RGB (0–1)0.0157, 0.1333, 0.3176
RGB percentages1.6%, 13.3%, 31.8%
HSLhsl(216.6, 90.6%, 16.7%)
HSV / HSBhsv(216.6, 95.1%, 31.8%)
CMYK95.1%, 58%, 0%, 68.2%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer270,929
CSS custom property--colour: #042251;

Brightness & contrast

Relative luminance0.01764WCAG 2.x, 0 is black and 1 is white
Perceived brightness37.8 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 15.52:1
Contrast with white15.52:1WCAG normal text: AAA
Contrast with black1.35:1WCAG normal text: Fail
Greyscale equivalent#1F1F1F
Inverted#FBDDAE

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#012853no red cones; affects about 1% of men; ΔE 4.9 from the original
Deuteranopia#002150no green cones; the most common form, about 1% of men; ΔE 0.6 from the original
Tritanopia#002E35no blue cones; rare, and affects men and women equally; ΔE 31.9 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text15.52:1WCAG large text: AAA
Contrast with black, large text1.35:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 25.1Midnight blue · ΔE 27.9Black · ΔE 36.3Dark slate grey · ΔE 39.5Rebecca purple · ΔE 40.6Steel blue · ΔE 40.9
Nearest named CSS colourDark slateblue (#483D8B)ΔE 25.13, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#513304
Analogous#044851, #0D0451
Triadic#510422, #225104
Split complementary#510D04, #485104
Tetradic#510448, #513304, #04510D

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#2C7AF5
Lighter +30%#0B5FE3
Lighter +20%#094BB2
Lighter +10%#063682
Darker −10%#020E20
Darker −20%#000000
Darker −30%#000000
Darker −40%#000000
More saturated +25%#002155
Less saturated −25%#0F2446

Channel breakdown

R4
G34
B81
Red4 (1.6%)
Green34 (13.3%)
Blue81 (31.8%)
Hue216.62°
Saturation (HSL)90.59%
Lightness16.67%
Dominant channelBlue
Hex per channelR 04 · G 22 · B 51

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Every value on this page was computed from “hex 042251” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.