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Recognised as Colour

#1540A0

  • #1540A0
  • Blue
  • Dark
  • Nearest: Dark slateblue

#1540A0 is a blue with RGB values 21, 64, 160 and HSL 221°, 77%, 35%. It is a dark colour, so white text on it reaches 9.2:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#1540A0#1540A0
HEX#1540A0
RGBrgb(21, 64, 160)
RGB (0–1)0.0824, 0.251, 0.6275
RGB percentages8.2%, 25.1%, 62.7%
HSLhsl(221.4, 76.8%, 35.5%)
HSV / HSBhsv(221.4, 86.9%, 62.7%)
CMYK86.9%, 60%, 0%, 37.3%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,392,800
CSS custom property--colour: #1540A0;

Brightness & contrast

Relative luminance0.06364WCAG 2.x, 0 is black and 1 is white
Perceived brightness73.9 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 9.24:1
Contrast with white9.24:1WCAG normal text: AAA
Contrast with black2.27:1WCAG normal text: Fail
Greyscale equivalent#3E3E3E
Inverted#EABF5F

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#004EA3no red cones; affects about 1% of men; ΔE 11.1 from the original
Deuteranopia#00419Eno green cones; the most common form, about 1% of men; ΔE 2.7 from the original
Tritanopia#005969no blue cones; rare, and affects men and women equally; ΔE 57.1 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text9.24:1WCAG large text: AAA
Contrast with black, large text2.27:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 14Midnight blue · ΔE 17.6Slate blue · ΔE 19.4Royal blue · ΔE 20Rebecca purple · ΔE 21.1Medium purple · ΔE 28.5
Nearest named CSS colourDark slateblue (#483D8B)ΔE 13.98, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#A07515
Analogous#1586A0, #2F15A0
Triadic#A01540, #40A015
Split complementary#A02F15, #86A015
Tetradic#A01586, #A07515, #15A02F

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#91AEF0
Lighter +30%#638DEB
Lighter +20%#366CE5
Lighter +10%#1B52CD
Darker −10%#0F2E73
Darker −20%#091C46
Darker −30%#030A19
Darker −40%#000000
More saturated +25%#0038B5
Less saturated −25%#2C4989

Channel breakdown

R21
G64
B160
Red21 (8.2%)
Green64 (25.1%)
Blue160 (62.7%)
Hue221.44°
Saturation (HSL)76.8%
Lightness35.49%
Dominant channelBlue
Hex per channelR 15 · G 40 · B A0

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Every value on this page was computed from “1540a0” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.