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Recognised as Colour

#042257

  • #042257
  • Blue
  • Dark
  • Nearest: Dark slateblue

#042257 is a blue with RGB values 4, 34, 87 and HSL 218°, 91%, 18%. It is a dark colour, so white text on it reaches 15.3:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#042257#042257
HEX#042257
RGBrgb(4, 34, 87)
RGB (0–1)0.0157, 0.1333, 0.3412
RGB percentages1.6%, 13.3%, 34.1%
HSLhsl(218.3, 91.2%, 17.8%)
HSV / HSBhsv(218.3, 95.4%, 34.1%)
CMYK95.4%, 60.9%, 0%, 65.9%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer270,935
CSS custom property--colour: #042257;

Brightness & contrast

Relative luminance0.01858WCAG 2.x, 0 is black and 1 is white
Perceived brightness39.3 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 15.31:1
Contrast with white15.31:1WCAG normal text: AAA
Contrast with black1.37:1WCAG normal text: Fail
Greyscale equivalent#1F1F1F
Inverted#FBDDA8

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#002959no red cones; affects about 1% of men; ΔE 5.9 from the original
Deuteranopia#002256no green cones; the most common form, about 1% of men; ΔE 1 from the original
Tritanopia#002F38no blue cones; rare, and affects men and women equally; ΔE 34.8 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text15.31:1WCAG large text: AAA
Contrast with black, large text1.37:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 21.9Midnight blue · ΔE 23.7Rebecca purple · ΔE 37Black · ΔE 40.1Steel blue · ΔE 41.5Indigo · ΔE 43.1
Nearest named CSS colourDark slateblue (#483D8B)ΔE 21.88, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#573904
Analogous#044B57, #100457
Triadic#570422, #225704
Split complementary#571004, #4B5704
Tetradic#57044B, #573904, #045710

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#3178F6
Lighter +30%#0B5BE9
Lighter +20%#0848B9
Lighter +10%#063588
Darker −10%#020F26
Darker −20%#000000
Darker −30%#000000
Darker −40%#000000
More saturated +25%#00215B
Less saturated −25%#0F254C

Channel breakdown

R4
G34
B87
Red4 (1.6%)
Green34 (13.3%)
Blue87 (34.1%)
Hue218.31°
Saturation (HSL)91.21%
Lightness17.84%
Dominant channelBlue
Hex per channelR 04 · G 22 · B 57

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Every value on this page was computed from “hex 042257” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.