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Colour

#1240A4

  • #1240A4
  • Blue
  • Dark
  • Nearest: Dark slateblue

#1240A4 is a blue with RGB values 18, 64, 164 and HSL 221°, 80%, 36%. It is a dark colour, so white text on it reaches 9.1:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#1240A4#1240A4
HEX#1240A4
RGBrgb(18, 64, 164)
RGB (0–1)0.0706, 0.251, 0.6431
RGB percentages7.1%, 25.1%, 64.3%
HSLhsl(221.1, 80.2%, 35.7%)
HSV / HSBhsv(221.1, 89%, 64.3%)
CMYK89%, 61%, 0%, 35.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,196,196
CSS custom property--colour: #1240A4;

Brightness & contrast

Relative luminance0.06476WCAG 2.x, 0 is black and 1 is white
Perceived brightness74.6 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 9.15:1
Contrast with white9.15:1WCAG normal text: AAA
Contrast with black2.3:1WCAG normal text: Fail
Greyscale equivalent#3D3D3D
Inverted#EDBF5B

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#004FA7no red cones; affects about 1% of men; ΔE 11.8 from the original
Deuteranopia#0042A2no green cones; the most common form, about 1% of men; ΔE 3.3 from the original
Tritanopia#005A6Bno blue cones; rare, and affects men and women equally; ΔE 59 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text9.15:1WCAG large text: AAA
Contrast with black, large text2.3:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 15.8Midnight blue · ΔE 18.1Slate blue · ΔE 18.3Royal blue · ΔE 18.8Rebecca purple · ΔE 20.8Medium slateblue · ΔE 27.8
Nearest named CSS colourDark slateblue (#483D8B)ΔE 15.8, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#A47612
Analogous#1289A4, #2D12A4
Triadic#A41240, #40A412
Split complementary#A42D12, #89A412
Tetradic#A41289, #A47612, #12A42D

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#8FAFF3
Lighter +30%#618EEE
Lighter +20%#336CE9
Lighter +10%#1752D2
Darker −10%#0D2E76
Darker −20%#081C48
Darker −30%#030A1A
Darker −40%#000000
More saturated +25%#0039B6
Less saturated −25%#29488D

Channel breakdown

R18
G64
B164
Red18 (7.1%)
Green64 (25.1%)
Blue164 (64.3%)
Hue221.1°
Saturation (HSL)80.22%
Lightness35.69%
Dominant channelBlue
Hex per channelR 12 · G 40 · B A4

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Every value on this page was computed from “1240a4” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.