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Colour

#1B0057

  • #1B0057
  • Violet
  • Dark
  • Nearest: Midnight blue

#1B0057 is a violet with RGB values 27, 0, 87 and HSL 259°, 100%, 17%. It is a dark colour, so white text on it reaches 17.7:1 contrast (AAA for normal text). The nearest named colour is Midnight blue.

Colour values

#1B0057#1B0057
HEX#1B0057
RGBrgb(27, 0, 87)
RGB (0–1)0.1059, 0, 0.3412
RGB percentages10.6%, 0%, 34.1%
HSLhsl(258.6, 100%, 17.1%)
HSV / HSBhsv(258.6, 100%, 34.1%)
CMYK69%, 100%, 0%, 65.9%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,769,559
CSS custom property--colour: #1B0057;

Brightness & contrast

Relative luminance0.00921WCAG 2.x, 0 is black and 1 is white
Perceived brightness32.9 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 17.73:1
Contrast with white17.73:1WCAG normal text: AAA
Contrast with black1.18:1WCAG normal text: Fail
Greyscale equivalent#0C0C0C
Inverted#E4FFA8

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#001B59no red cones; affects about 1% of men; ΔE 19.5 from the original
Deuteranopia#001556no green cones; the most common form, about 1% of men; ΔE 15.8 from the original
Tritanopia#001E30no blue cones; rare, and affects men and women equally; ΔE 50.4 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text17.73:1WCAG large text: AAA
Contrast with black, large text1.18:1WCAG large text: Fail

Named colours

Midnight blue · ΔE 10.1Indigo · ΔE 20.6Navy · ΔE 22.4Dark slateblue · ΔE 25.3Rebecca purple · ΔE 25.3Dark blue · ΔE 27.6
Nearest named CSS colourMidnight blue (#191970)ΔE 10.13, a distinctly different colour
Hue familyviolet
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#3C5700
Analogous#001057, #470057
Triadic#571B00, #00571B
Split complementary#574700, #105700
Tetradic#570010, #3C5700, #005747

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#6824FF
Lighter +30%#4A00F0
Lighter +20%#3B00BD
Lighter +10%#2B008A
Darker −10%#0B0024
Darker −20%#000000
Darker −30%#000000
Darker −40%#000000
More saturated +25%#1B0057
Less saturated −25%#1F0B4C

Channel breakdown

R27
G0
B87
Red27 (10.6%)
Green0 (0%)
Blue87 (34.1%)
Hue258.62°
Saturation (HSL)100%
Lightness17.06%
Dominant channelBlue
Hex per channelR 1B · G 00 · B 57

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Every value on this page was computed from “1b0057” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.