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Recognised as Colour

#153B8D

  • #153B8D
  • Blue
  • Dark
  • Nearest: Dark slateblue

#153B8D is a blue with RGB values 21, 59, 141 and HSL 221°, 74%, 32%. It is a dark colour, so white text on it reaches 10.3:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#153B8D#153B8D
HEX#153B8D
RGBrgb(21, 59, 141)
RGB (0–1)0.0824, 0.2314, 0.5529
RGB percentages8.2%, 23.1%, 55.3%
HSLhsl(221, 74.1%, 31.8%)
HSV / HSBhsv(221, 85.1%, 55.3%)
CMYK85.1%, 58.2%, 0%, 44.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,391,501
CSS custom property--colour: #153B8D;

Brightness & contrast

Relative luminance0.0521WCAG 2.x, 0 is black and 1 is white
Perceived brightness66.6 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 10.28:1
Contrast with white10.28:1WCAG normal text: AAA
Contrast with black2.04:1WCAG normal text: Fail
Greyscale equivalent#393939
Inverted#EAC472

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#004690no red cones; affects about 1% of men; ΔE 8.9 from the original
Deuteranopia#003B8Bno green cones; the most common form, about 1% of men; ΔE 2.3 from the original
Tritanopia#00505Eno blue cones; rare, and affects men and women equally; ΔE 49.7 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text10.28:1WCAG large text: AAA
Contrast with black, large text2.04:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 10.2Midnight blue · ΔE 16.7Rebecca purple · ΔE 24Slate blue · ΔE 25.9Royal blue · ΔE 26.9Medium purple · ΔE 32.6
Nearest named CSS colourDark slateblue (#483D8B)ΔE 10.19, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#8D6715
Analogous#15778D, #2B158D
Triadic#8D153B, #3B8D15
Split complementary#8D2B15, #778D15
Tetradic#8D1577, #8D6715, #158D2B

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#82A3EC
Lighter +30%#5583E6
Lighter +20%#2963DF
Lighter +10%#1C4EB9
Darker −10%#0E2861
Darker −20%#081634
Darker −30%#010308
Darker −40%#000000
More saturated +25%#0134A1
Less saturated −25%#294279

Channel breakdown

R21
G59
B141
Red21 (8.2%)
Green59 (23.1%)
Blue141 (55.3%)
Hue221°
Saturation (HSL)74.07%
Lightness31.76%
Dominant channelBlue
Hex per channelR 15 · G 3B · B 8D

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Every value on this page was computed from “153b8d” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.