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Recognised as Colour

#1D55AF

  • #1D55AF
  • Blue
  • Dark
  • Nearest: Dark slateblue

#1D55AF is a blue with RGB values 29, 85, 175 and HSL 217°, 72%, 40%. It is a dark colour, so white text on it reaches 7.1:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#1D55AF#1D55AF
HEX#1D55AF
RGBrgb(29, 85, 175)
RGB (0–1)0.1137, 0.3333, 0.6863
RGB percentages11.4%, 33.3%, 68.6%
HSLhsl(217, 71.6%, 40%)
HSV / HSBhsv(217, 83.4%, 68.6%)
CMYK83.4%, 51.4%, 0%, 31.4%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,922,479
CSS custom property--colour: #1D55AF;

Brightness & contrast

Relative luminance0.09853WCAG 2.x, 0 is black and 1 is white
Perceived brightness89.4 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 7.07:1
Contrast with white7.07:1WCAG normal text: AAA
Contrast with black2.97:1WCAG normal text: Fail
Greyscale equivalent#505050
Inverted#E2AA50

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#195FB2no red cones; affects about 1% of men; ΔE 7.2 from the original
Deuteranopia#0052ADno green cones; the most common form, about 1% of men; ΔE 2 from the original
Tritanopia#006B7Ano blue cones; rare, and affects men and women equally; ΔE 52.3 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text7.07:1WCAG large text: AAA
Contrast with black, large text2.97:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 16.1Royal blue · ΔE 18.8Slate blue · ΔE 21.7Dodgerblue · ΔE 25Cornflower blue · ΔE 25.6Midnight blue · ΔE 26.9
Nearest named CSS colourDark slateblue (#483D8B)ΔE 16.14, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#AF771D
Analogous#1D9EAF, #2E1DAF
Triadic#AF1D55, #55AF1D
Split complementary#AF2E1D, #9EAF1D
Tetradic#AF1D9E, #AF771D, #1DAF2E

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#A8C4F1
Lighter +30%#7CA6E9
Lighter +20%#5088E2
Lighter +10%#246ADB
Darker −10%#164083
Darker −20%#0F2B58
Darker −30%#07152C
Darker −40%#000000
More saturated +25%#044FC9
Less saturated −25%#375B96

Channel breakdown

R29
G85
B175
Red29 (11.4%)
Green85 (33.3%)
Blue175 (68.6%)
Hue216.99°
Saturation (HSL)71.57%
Lightness40%
Dominant channelBlue
Hex per channelR 1D · G 55 · B AF

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Every value on this page was computed from “1d55af” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.