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Colour

#1B51AA

  • #1B51AA
  • Blue
  • Dark
  • Nearest: Dark slateblue

#1B51AA is a blue with RGB values 27, 81, 170 and HSL 217°, 73%, 39%. It is a dark colour, so white text on it reaches 7.5:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#1B51AA#1B51AA
HEX#1B51AA
RGBrgb(27, 81, 170)
RGB (0–1)0.1059, 0.3176, 0.6667
RGB percentages10.6%, 31.8%, 66.7%
HSLhsl(217.3, 72.6%, 38.6%)
HSV / HSBhsv(217.3, 84.1%, 66.7%)
CMYK84.1%, 52.4%, 0%, 33.3%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,790,378
CSS custom property--colour: #1B51AA;

Brightness & contrast

Relative luminance0.0902WCAG 2.x, 0 is black and 1 is white
Perceived brightness85.8 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 7.49:1
Contrast with white7.49:1WCAG normal text: AAA
Contrast with black2.8:1WCAG normal text: Fail
Greyscale equivalent#4C4C4C
Inverted#E4AE55

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#125CADno red cones; affects about 1% of men; ΔE 8.2 from the original
Deuteranopia#004FA8no green cones; the most common form, about 1% of men; ΔE 1.7 from the original
Tritanopia#006775no blue cones; rare, and affects men and women equally; ΔE 52.6 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text7.49:1WCAG large text: AAA
Contrast with black, large text2.8:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 14.9Royal blue · ΔE 19.7Slate blue · ΔE 22Midnight blue · ΔE 25.3Dodgerblue · ΔE 26.6Rebecca purple · ΔE 26.8
Nearest named CSS colourDark slateblue (#483D8B)ΔE 14.93, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#AA741B
Analogous#1B98AA, #2D1BAA
Triadic#AA1B51, #51AA1B
Split complementary#AA2D1B, #98AA1B
Tetradic#AA1B98, #AA741B, #1BAA2D

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#A1BFF0
Lighter +30%#75A1E9
Lighter +20%#4983E2
Lighter +10%#2266D6
Darker −10%#143C7E
Darker −20%#0D2752
Darker −30%#061226
Darker −40%#000000
More saturated +25%#024BC3
Less saturated −25%#345791

Channel breakdown

R27
G81
B170
Red27 (10.6%)
Green81 (31.8%)
Blue170 (66.7%)
Hue217.34°
Saturation (HSL)72.59%
Lightness38.63%
Dominant channelBlue
Hex per channelR 1B · G 51 · B AA

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Every value on this page was computed from “1b51aa” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.