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Recognised as Colour

#1581BB

  • #1581BB
  • Blue
  • Dark
  • Nearest: Steel blue

#1581BB is a blue with RGB values 21, 129, 187 and HSL 201°, 80%, 41%. It is a dark colour, so black text on it reaches 4.9:1 contrast (AA for normal text). The nearest named colour is Steel blue.

Colour values

#1581BB#1581BB
HEX#1581BB
RGBrgb(21, 129, 187)
RGB (0–1)0.0824, 0.5059, 0.7333
RGB percentages8.2%, 50.6%, 73.3%
HSLhsl(201, 79.8%, 40.8%)
HSV / HSBhsv(201, 88.8%, 73.3%)
CMYK88.8%, 31%, 0%, 26.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,409,467
CSS custom property--colour: #1581BB;

Brightness & contrast

Relative luminance0.19448WCAG 2.x, 0 is black and 1 is white
Perceived brightness117.8 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 4.89:1
Contrast with white4.29:1WCAG normal text: Fail
Contrast with black4.89:1WCAG normal text: AA
Greyscale equivalent#6E6E6E
Inverted#EA7E44

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#6582BEno red cones; affects about 1% of men; ΔE 14.2 from the original
Deuteranopia#4F74BAno green cones; the most common form, about 1% of men; ΔE 15.8 from the original
Tritanopia#009096no blue cones; rare, and affects men and women equally; ΔE 34.2 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text4.29:1WCAG large text: AA
Contrast with black, large text4.89:1WCAG large text: AAA

Named colours

Steel blue · ΔE 7Cornflower blue · ΔE 22.6Deep skyblue · ΔE 24.1Light slate grey · ΔE 28Slate grey · ΔE 28.2Light skyblue · ΔE 30.4
Nearest named CSS colourSteel blue (#4682B4)ΔE 6.99, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#BB4F15
Analogous#15BBA2, #152EBB
Triadic#BB1581, #81BB15
Split complementary#BB152E, #BBA215
Tetradic#A215BB, #BB4F15, #2EBB15

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#A7DAF5
Lighter +30%#79C6F0
Lighter +20%#4BB3EB
Lighter +10%#1DA0E6
Darker −10%#10618D
Darker −20%#0B425F
Darker −30%#062231
Darker −40%#000204
More saturated +25%#0087D0
Less saturated −25%#2F79A1

Channel breakdown

R21
G129
B187
Red21 (8.2%)
Green129 (50.6%)
Blue187 (73.3%)
Hue200.96°
Saturation (HSL)79.81%
Lightness40.78%
Dominant channelBlue
Hex per channelR 15 · G 81 · B BB

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Every value on this page was computed from “1581bb” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.