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Recognised as Colour

#153C51

  • #153C51
  • Blue
  • Dark
  • Nearest: Dark slate grey

#153C51 is a blue with RGB values 21, 60, 81 and HSL 201°, 59%, 20%. It is a dark colour, so white text on it reaches 11.7:1 contrast (AAA for normal text). The nearest named colour is Dark slate grey.

Colour values

#153C51#153C51
HEX#153C51
RGBrgb(21, 60, 81)
RGB (0–1)0.0824, 0.2353, 0.3176
RGB percentages8.2%, 23.5%, 31.8%
HSLhsl(201, 58.8%, 20%)
HSV / HSBhsv(201, 74.1%, 31.8%)
CMYK74.1%, 25.9%, 0%, 68.2%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,391,697
CSS custom property--colour: #153C51;

Brightness & contrast

Relative luminance0.03985WCAG 2.x, 0 is black and 1 is white
Perceived brightness54.7 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 11.69:1
Contrast with white11.69:1WCAG normal text: AAA
Contrast with black1.8:1WCAG normal text: Fail
Greyscale equivalent#353535
Inverted#EAC3AE

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#323C52no red cones; affects about 1% of men; ΔE 8.5 from the original
Deuteranopia#2A3651no green cones; the most common form, about 1% of men; ΔE 9.4 from the original
Tritanopia#004143no blue cones; rare, and affects men and women equally; ΔE 15.3 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text11.69:1WCAG large text: AAA
Contrast with black, large text1.8:1WCAG large text: Fail

Named colours

Dark slate grey · ΔE 16.2Dim grey · ΔE 27.3Black · ΔE 29.5Slate grey · ΔE 30.1Steel blue · ΔE 32.8Light slate grey · ΔE 33
Nearest named CSS colourDark slate grey (#2F4F4F)ΔE 16.18, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#512A15
Analogous#155148, #151E51
Triadic#51153C, #3C5115
Split complementary#51151E, #514815
Tetradic#481551, #512A15, #1E5115

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#5DABD5
Lighter +30%#3496CB
Lighter +20%#2A78A2
Lighter +10%#1F5A7A
Darker −10%#0B1E29
Darker −20%#000000
Darker −30%#000000
Darker −40%#000000
More saturated +25%#08405E
Less saturated −25%#223844

Channel breakdown

R21
G60
B81
Red21 (8.2%)
Green60 (23.5%)
Blue81 (31.8%)
Hue201°
Saturation (HSL)58.82%
Lightness20%
Dominant channelBlue
Hex per channelR 15 · G 3C · B 51

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Every value on this page was computed from “153c51” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.