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Recognised as Colour

#1F55BF

  • #1F55BF
  • Blue
  • Dark
  • Nearest: Royal blue

#1F55BF is a blue with RGB values 31, 85, 191 and HSL 220°, 72%, 44%. It is a dark colour, so white text on it reaches 6.8:1 contrast (AA for normal text). The nearest named colour is Royal blue.

Colour values

#1F55BF#1F55BF
HEX#1F55BF
RGBrgb(31, 85, 191)
RGB (0–1)0.1216, 0.3333, 0.749
RGB percentages12.2%, 33.3%, 74.9%
HSLhsl(219.8, 72.1%, 43.5%)
HSV / HSBhsv(219.8, 83.8%, 74.9%)
CMYK83.8%, 55.5%, 0%, 25.1%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,053,567
CSS custom property--colour: #1F55BF;

Brightness & contrast

Relative luminance0.1055WCAG 2.x, 0 is black and 1 is white
Perceived brightness93.2 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 6.75:1
Contrast with white6.75:1WCAG normal text: AA
Contrast with black3.11:1WCAG normal text: Fail
Greyscale equivalent#515151
Inverted#E0AA40

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#0063C3no red cones; affects about 1% of men; ΔE 10.6 from the original
Deuteranopia#0054BDno green cones; the most common form, about 1% of men; ΔE 2 from the original
Tritanopia#006F81no blue cones; rare, and affects men and women equally; ΔE 60.6 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text6.75:1WCAG large text: AAA
Contrast with black, large text3.11:1WCAG large text: AA

Named colours

Royal blue · ΔE 10.8Slate blue · ΔE 15Dark slateblue · ΔE 20.3Medium slateblue · ΔE 23.2Medium purple · ΔE 23.8Dodgerblue · ΔE 24.4
Nearest named CSS colourRoyal blue (#4169E1)ΔE 10.81, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#BF891F
Analogous#1FA5BF, #391FBF
Triadic#BF1F55, #55BF1F
Split complementary#BF391F, #A5BF1F
Tetradic#BF1FA5, #BF891F, #1FBF39

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#B7CBF3
Lighter +30%#8BACEC
Lighter +20%#5F8CE5
Lighter +10%#336DDE
Darker −10%#184193
Darker −20%#112E67
Darker −30%#0A1A3B
Darker −40%#03070F
More saturated +25%#034CDB
Less saturated −25%#3B5EA3

Channel breakdown

R31
G85
B191
Red31 (12.2%)
Green85 (33.3%)
Blue191 (74.9%)
Hue219.75°
Saturation (HSL)72.07%
Lightness43.53%
Dominant channelBlue
Hex per channelR 1F · G 55 · B BF

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Every value on this page was computed from “1f55bf” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.