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Colour

#153D8D

  • #153D8D
  • Blue
  • Dark
  • Nearest: Dark slateblue

#153D8D is a blue with RGB values 21, 61, 141 and HSL 220°, 74%, 32%. It is a dark colour, so white text on it reaches 10.1:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#153D8D#153D8D
HEX#153D8D
RGBrgb(21, 61, 141)
RGB (0–1)0.0824, 0.2392, 0.5529
RGB percentages8.2%, 23.9%, 55.3%
HSLhsl(220, 74.1%, 31.8%)
HSV / HSBhsv(220, 85.1%, 55.3%)
CMYK85.1%, 56.7%, 0%, 44.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,392,013
CSS custom property--colour: #153D8D;

Brightness & contrast

Relative luminance0.0542WCAG 2.x, 0 is black and 1 is white
Perceived brightness67.7 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 10.08:1
Contrast with white10.08:1WCAG normal text: AAA
Contrast with black2.08:1WCAG normal text: Fail
Greyscale equivalent#3A3A3A
Inverted#EAC272

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#004890no red cones; affects about 1% of men; ΔE 8.9 from the original
Deuteranopia#003D8Bno green cones; the most common form, about 1% of men; ΔE 2.3 from the original
Tritanopia#00515Fno blue cones; rare, and affects men and women equally; ΔE 48.1 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text10.08:1WCAG large text: AAA
Contrast with black, large text2.08:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 10.4Midnight blue · ΔE 18.2Rebecca purple · ΔE 25.2Slate blue · ΔE 26.7Royal blue · ΔE 27.4Medium purple · ΔE 32.9
Nearest named CSS colourDark slateblue (#483D8B)ΔE 10.39, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#8D6515
Analogous#15798D, #29158D
Triadic#8D153D, #3D8D15
Split complementary#8D2915, #798D15
Tetradic#8D1579, #8D6515, #158D29

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#82A5EC
Lighter +30%#5585E6
Lighter +20%#2966DF
Lighter +10%#1C50B9
Darker −10%#0E2A61
Darker −20%#081734
Darker −30%#010308
Darker −40%#000000
More saturated +25%#0136A1
Less saturated −25%#294479

Channel breakdown

R21
G61
B141
Red21 (8.2%)
Green61 (23.9%)
Blue141 (55.3%)
Hue220°
Saturation (HSL)74.07%
Lightness31.76%
Dominant channelBlue
Hex per channelR 15 · G 3D · B 8D

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Every value on this page was computed from “153d8d” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.