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Recognised as Colour

#1583AB

  • #1583AB
  • Cyan
  • Dark
  • Nearest: Steel blue

#1583AB is a cyan with RGB values 21, 131, 171 and HSL 196°, 78%, 38%. 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

#1583AB#1583AB
HEX#1583AB
RGBrgb(21, 131, 171)
RGB (0–1)0.0824, 0.5137, 0.6706
RGB percentages8.2%, 51.4%, 67.1%
HSLhsl(196, 78.1%, 37.6%)
HSV / HSBhsv(196, 87.7%, 67.1%)
CMYK87.7%, 23.4%, 0%, 32.9%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,409,963
CSS custom property--colour: #1583AB;

Brightness & contrast

Relative luminance0.19332WCAG 2.x, 0 is black and 1 is white
Perceived brightness116.4 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 4.87:1
Contrast with white4.32:1WCAG normal text: Fail
Contrast with black4.87:1WCAG normal text: AA
Greyscale equivalent#6F6F6F
Inverted#EA7C54

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#6E81ADno red cones; affects about 1% of men; ΔE 19.1 from the original
Deuteranopia#5B74AAno green cones; the most common form, about 1% of men; ΔE 20.4 from the original
Tritanopia#008E90no blue cones; rare, and affects men and women equally; ΔE 25.1 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text4.32:1WCAG large text: AA
Contrast with black, large text4.87:1WCAG large text: AAA

Named colours

Steel blue · ΔE 10.8Light slate grey · ΔE 22.4Slate grey · ΔE 22.4Cadetblue · ΔE 24.7Deep skyblue · ΔE 25.5Teal · ΔE 25.5
Nearest named CSS colourSteel blue (#4682B4)ΔE 10.75, a distinctly different colour
Hue familycyan
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#AB3D15
Analogous#15AB88, #1538AB
Triadic#AB1583, #83AB15
Split complementary#AB1538, #AB8815
Tetradic#8815AB, #AB3D15, #38AB15

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#99DBF3
Lighter +30%#6CCBED
Lighter +20%#3FBAE7
Lighter +10%#1BA6D8
Darker −10%#0F607E
Darker −20%#0A3D50
Darker −30%#041B23
Darker −40%#000000
More saturated +25%#008DC0
Less saturated −25%#2D7893

Channel breakdown

R21
G131
B171
Red21 (8.2%)
Green131 (51.4%)
Blue171 (67.1%)
Hue196°
Saturation (HSL)78.12%
Lightness37.65%
Dominant channelBlue
Hex per channelR 15 · G 83 · B AB

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Every value on this page was computed from “1583ab” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.