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Recognised as Colour

#1550B0

  • #1550B0
  • Blue
  • Dark
  • Nearest: Dark slateblue

#1550B0 is a blue with RGB values 21, 80, 176 and HSL 217°, 79%, 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

#1550B0#1550B0
HEX#1550B0
RGBrgb(21, 80, 176)
RGB (0–1)0.0824, 0.3137, 0.6902
RGB percentages8.2%, 31.4%, 69%
HSLhsl(217.2, 78.7%, 38.6%)
HSV / HSBhsv(217.2, 88.1%, 69%)
CMYK88.1%, 54.5%, 0%, 31%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,396,912
CSS custom property--colour: #1550B0;

Brightness & contrast

Relative luminance0.09031WCAG 2.x, 0 is black and 1 is white
Perceived brightness86.1 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 7.48:1
Contrast with white7.48:1WCAG normal text: AAA
Contrast with black2.81:1WCAG normal text: Fail
Greyscale equivalent#4A4A4A
Inverted#EAAF4F

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#005CB3no red cones; affects about 1% of men; ΔE 9.2 from the original
Deuteranopia#004EAEno green cones; the most common form, about 1% of men; ΔE 1.2 from the original
Tritanopia#006878no blue cones; rare, and affects men and women equally; ΔE 55.7 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text7.48:1WCAG large text: AAA
Contrast with black, large text2.81:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 16.4Royal blue · ΔE 16.4Slate blue · ΔE 19.1Midnight blue · ΔE 24.5Rebecca purple · ΔE 25.3Dodgerblue · ΔE 26.2
Nearest named CSS colourDark slateblue (#483D8B)ΔE 16.38, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#B07515
Analogous#159EB0, #2715B0
Triadic#B01550, #50B015
Split complementary#B02715, #9EB015
Tetradic#B0159E, #B07515, #15B027

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#9EBEF3
Lighter +30%#70A0EE
Lighter +20%#4282E9
Lighter +10%#1A65DE
Darker −10%#103B82
Darker −20%#0A2755
Darker −30%#051227
Darker −40%#000000
More saturated +25%#004BC5
Less saturated −25%#2E5697

Channel breakdown

R21
G80
B176
Red21 (8.2%)
Green80 (31.4%)
Blue176 (69%)
Hue217.16°
Saturation (HSL)78.68%
Lightness38.63%
Dominant channelBlue
Hex per channelR 15 · G 50 · B B0

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Every value on this page was computed from “1550b0” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.