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Recognised as Colour

#1B1531

  • #1B1531
  • Blue
  • Dark
  • Nearest: Black

#1B1531 is a blue with RGB values 27, 21, 49 and HSL 253°, 40%, 14%. It is a dark colour, so white text on it reaches 17.5:1 contrast (AAA for normal text). The nearest named colour is Black.

Colour values

#1B1531#1B1531
HEX#1B1531
RGBrgb(27, 21, 49)
RGB (0–1)0.1059, 0.0824, 0.1922
RGB percentages10.6%, 8.2%, 19.2%
HSLhsl(252.9, 40%, 13.7%)
HSV / HSBhsv(252.9, 57.1%, 19.2%)
CMYK44.9%, 57.1%, 0%, 80.8%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,774,897
CSS custom property--colour: #1B1531;

Brightness & contrast

Relative luminance0.00991WCAG 2.x, 0 is black and 1 is white
Perceived brightness27.4 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 17.53:1
Contrast with white17.53:1WCAG normal text: AAA
Contrast with black1.2:1WCAG normal text: Fail
Greyscale equivalent#181818
Inverted#E4EACE

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#0B1A32no red cones; affects about 1% of men; ΔE 8 from the original
Deuteranopia#0B1930no green cones; the most common form, about 1% of men; ΔE 8.1 from the original
Tritanopia#151B20no blue cones; rare, and affects men and women equally; ΔE 18.3 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text17.53:1WCAG large text: AAA
Contrast with black, large text1.2:1WCAG large text: Fail

Named colours

Black · ΔE 22.8Dark slate grey · ΔE 35Dark slateblue · ΔE 36Midnight blue · ΔE 38.5Dim grey · ΔE 41.2Slate grey · ΔE 46.5
Nearest named CSS colourBlack (#000000)ΔE 22.81, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#2B3115
Analogous#151D31, #291531
Triadic#311B15, #15311B
Split complementary#312915, #1D3115
Tetradic#31151D, #2B3115, #153129

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#6E5AB8
Lighter +30%#56439C
Lighter +20%#423478
Lighter +10%#2F2455
Darker −10%#07060D
Darker −20%#000000
Darker −30%#000000
Darker −40%#000000
More saturated +25%#160C3A
Less saturated −25%#201E28

Channel breakdown

R27
G21
B49
Red27 (10.6%)
Green21 (8.2%)
Blue49 (19.2%)
Hue252.86°
Saturation (HSL)40%
Lightness13.73%
Dominant channelBlue
Hex per channelR 1B · G 15 · B 31

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Every value on this page was computed from “1b1531” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.