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Recognised as Colour

#42458D

  • #42458D
  • Blue
  • Dark
  • Nearest: Dark slateblue

#42458D is a blue with RGB values 66, 69, 141 and HSL 238°, 36%, 41%. It is a dark colour, so white text on it reaches 8.5:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#42458D#42458D
HEX#42458D
RGBrgb(66, 69, 141)
RGB (0–1)0.2588, 0.2706, 0.5529
RGB percentages25.9%, 27.1%, 55.3%
HSLhsl(237.6, 36.2%, 40.6%)
HSV / HSBhsv(237.6, 53.2%, 55.3%)
CMYK53.2%, 51.1%, 0%, 44.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer4,343,181
CSS custom property--colour: #42458D;

Brightness & contrast

Relative luminance0.07338WCAG 2.x, 0 is black and 1 is white
Perceived brightness79.8 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 8.51:1
Contrast with white8.51:1WCAG normal text: AAA
Contrast with black2.47:1WCAG normal text: Fail
Greyscale equivalent#4A4A4A
Inverted#BDBA72

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#225090no red cones; affects about 1% of men; ΔE 12.3 from the original
Deuteranopia#1A4A8Bno green cones; the most common form, about 1% of men; ΔE 11.2 from the original
Tritanopia#225562no blue cones; rare, and affects men and women equally; ΔE 43 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text8.51:1WCAG large text: AAA
Contrast with black, large text2.47:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 6.4Midnight blue · ΔE 22.3Rebecca purple · ΔE 23.7Slate blue · ΔE 26.7Medium purple · ΔE 29.5Royal blue · ΔE 29.7
Nearest named CSS colourDark slateblue (#483D8B)ΔE 6.39, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#8D8A42
Analogous#426A8D, #64428D
Triadic#8D4245, #458D42
Split complementary#8D6542, #6A8D42
Tetradic#8D426A, #8D8A42, #428D65

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#BCBDDF
Lighter +30%#999BCF
Lighter +20%#7679BF
Lighter +10%#5357AF
Darker −10%#32346A
Darker −20%#212348
Darker −30%#111225
Darker −40%#010102
More saturated +25%#282DA7
Less saturated −25%#5C5D73

Channel breakdown

R66
G69
B141
Red66 (25.9%)
Green69 (27.1%)
Blue141 (55.3%)
Hue237.6°
Saturation (HSL)36.23%
Lightness40.59%
Dominant channelBlue
Hex per channelR 42 · G 45 · B 8D

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Every value on this page was computed from “42458d” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.