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Recognised as Colour

#1B1556

  • #1B1556
  • Blue
  • Dark
  • Nearest: Midnight blue

#1B1556 is a blue with RGB values 27, 21, 86 and HSL 246°, 61%, 21%. It is a dark colour, so white text on it reaches 16.3:1 contrast (AAA for normal text). The nearest named colour is Midnight blue.

Colour values

#1B1556#1B1556
HEX#1B1556
RGBrgb(27, 21, 86)
RGB (0–1)0.1059, 0.0824, 0.3373
RGB percentages10.6%, 8.2%, 33.7%
HSLhsl(245.5, 60.7%, 21%)
HSV / HSBhsv(245.5, 75.6%, 33.7%)
CMYK68.6%, 75.6%, 0%, 66.3%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,774,934
CSS custom property--colour: #1B1556;

Brightness & contrast

Relative luminance0.01441WCAG 2.x, 0 is black and 1 is white
Perceived brightness36.3 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 16.3:1
Contrast with white16.3:1WCAG normal text: AAA
Contrast with black1.29:1WCAG normal text: Fail
Greyscale equivalent#1B1B1B
Inverted#E4EAA9

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#002258no red cones; affects about 1% of men; ΔE 12.4 from the original
Deuteranopia#001D55no green cones; the most common form, about 1% of men; ΔE 9.6 from the original
Tritanopia#002733no blue cones; rare, and affects men and women equally; ΔE 42.5 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text16.3:1WCAG large text: AAA
Contrast with black, large text1.29:1WCAG large text: Fail

Named colours

Midnight blue · ΔE 13.6Dark slateblue · ΔE 19Rebecca purple · ΔE 28.7Indigo · ΔE 31.7Navy · ΔE 34.7Purple · ΔE 38.2
Nearest named CSS colourMidnight blue (#191970)ΔE 13.61, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#505615
Analogous#152F56, #3C1556
Triadic#561B15, #15561B
Split complementary#563C15, #2F5615
Tetradic#56152F, #505615, #15563C

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#6A5FD8
Lighter +30%#4436CE
Lighter +20%#3529A8
Lighter +10%#281F7F
Darker −10%#0E0B2D
Darker −20%#010104
Darker −30%#000000
Darker −40%#000000
More saturated +25%#100863
Less saturated −25%#262249

Channel breakdown

R27
G21
B86
Red27 (10.6%)
Green21 (8.2%)
Blue86 (33.7%)
Hue245.54°
Saturation (HSL)60.75%
Lightness20.98%
Dominant channelBlue
Hex per channelR 1B · G 15 · B 56

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Every value on this page was computed from “1b1556” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.