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Recognised as Colour

#1B4DB2

  • #1B4DB2
  • Blue
  • Dark
  • Nearest: Royal blue

#1B4DB2 is a blue with RGB values 27, 77, 178 and HSL 220°, 74%, 40%. It is a dark colour, so white text on it reaches 7.6:1 contrast (AAA for normal text). The nearest named colour is Royal blue.

Colour values

#1B4DB2#1B4DB2
HEX#1B4DB2
RGBrgb(27, 77, 178)
RGB (0–1)0.1059, 0.302, 0.698
RGB percentages10.6%, 30.2%, 69.8%
HSLhsl(220.1, 73.7%, 40.2%)
HSV / HSBhsv(220.1, 84.8%, 69.8%)
CMYK84.8%, 56.7%, 0%, 30.2%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,789,362
CSS custom property--colour: #1B4DB2;

Brightness & contrast

Relative luminance0.08755WCAG 2.x, 0 is black and 1 is white
Perceived brightness85.5 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 7.63:1
Contrast with white7.63:1WCAG normal text: AAA
Contrast with black2.75:1WCAG normal text: Fail
Greyscale equivalent#4A4A4A
Inverted#E4B24D

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#005BB5no red cones; affects about 1% of men; ΔE 11.1 from the original
Deuteranopia#004DB0no green cones; the most common form, about 1% of men; ΔE 2.3 from the original
Tritanopia#006678no blue cones; rare, and affects men and women equally; ΔE 58 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text7.63:1WCAG large text: AAA
Contrast with black, large text2.75:1WCAG large text: Fail

Named colours

Royal blue · ΔE 14.7Slate blue · ΔE 16.6Dark slateblue · ΔE 17.1Rebecca purple · ΔE 23.2Midnight blue · ΔE 23.3Medium purple · ΔE 25.4
Nearest named CSS colourRoyal blue (#4169E1)ΔE 14.66, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#B2801B
Analogous#1B99B2, #341BB2
Triadic#B21B4D, #4DB21B
Split complementary#B2341B, #99B21B
Tetradic#B21B99, #B2801B, #1BB235

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#A7C0F2
Lighter +30%#7BA0EB
Lighter +20%#4F80E4
Lighter +10%#2260DE
Darker −10%#143A86
Darker −20%#0E2759
Darker −30%#07142D
Darker −40%#000001
More saturated +25%#0144CC
Less saturated −25%#355698

Channel breakdown

R27
G77
B178
Red27 (10.6%)
Green77 (30.2%)
Blue178 (69.8%)
Hue220.13°
Saturation (HSL)73.66%
Lightness40.2%
Dominant channelBlue
Hex per channelR 1B · G 4D · B B2

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Every value on this page was computed from “1b4db2” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.