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Recognised as Colour

#1B3D73

  • #1B3D73
  • Blue
  • Dark
  • Nearest: Dark slateblue

#1B3D73 is a blue with RGB values 27, 61, 115 and HSL 217°, 62%, 28%. It is a dark colour, so white text on it reaches 10.7:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#1B3D73#1B3D73
HEX#1B3D73
RGBrgb(27, 61, 115)
RGB (0–1)0.1059, 0.2392, 0.451
RGB percentages10.6%, 23.9%, 45.1%
HSLhsl(216.8, 62%, 27.8%)
HSV / HSBhsv(216.8, 76.5%, 45.1%)
CMYK76.5%, 47%, 0%, 54.9%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,785,203
CSS custom property--colour: #1B3D73;

Brightness & contrast

Relative luminance0.04808WCAG 2.x, 0 is black and 1 is white
Perceived brightness62.5 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 10.71:1
Contrast with white10.71:1WCAG normal text: AAA
Contrast with black1.96:1WCAG normal text: Fail
Greyscale equivalent#3A3A3A
Inverted#E4C28C

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#224275no red cones; affects about 1% of men; ΔE 3.2 from the original
Deuteranopia#103A72no green cones; the most common form, about 1% of men; ΔE 2.1 from the original
Tritanopia#004A52no blue cones; rare, and affects men and women equally; ΔE 34.8 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text10.71:1WCAG large text: AAA
Contrast with black, large text1.96:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 19.9Steel blue · ΔE 29.1Midnight blue · ΔE 29.7Dark slate grey · ΔE 37.2Slate grey · ΔE 37.4Rebecca purple · ΔE 37.5
Nearest named CSS colourDark slateblue (#483D8B)ΔE 19.89, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#73511B
Analogous#1B6973, #251B73
Triadic#731B3D, #3D731B
Split complementary#73251B, #69731B
Tetradic#731B69, #73511B, #1B7325

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#7AA1E0
Lighter +30%#5184D6
Lighter +20%#2E69C6
Lighter +10%#25539C
Darker −10%#11274A
Darker −20%#081120
Darker −30%#000000
Darker −40%#000000
More saturated +25%#093985
Less saturated −25%#2D4161

Channel breakdown

R27
G61
B115
Red27 (10.6%)
Green61 (23.9%)
Blue115 (45.1%)
Hue216.82°
Saturation (HSL)61.97%
Lightness27.84%
Dominant channelBlue
Hex per channelR 1B · G 3D · B 73

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Every value on this page was computed from “1b3d73” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.