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Recognised as Colour

#1F58B7

  • #1F58B7
  • Blue
  • Dark
  • Nearest: Royal blue

#1F58B7 is a blue with RGB values 31, 88, 183 and HSL 218°, 71%, 42%. It is a dark colour, so white text on it reaches 6.7:1 contrast (AA for normal text). The nearest named colour is Royal blue.

Colour values

#1F58B7#1F58B7
HEX#1F58B7
RGBrgb(31, 88, 183)
RGB (0–1)0.1216, 0.3451, 0.7176
RGB percentages12.2%, 34.5%, 71.8%
HSLhsl(217.5, 71%, 42%)
HSV / HSBhsv(217.5, 83.1%, 71.8%)
CMYK83.1%, 51.9%, 0%, 28.2%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,054,327
CSS custom property--colour: #1F58B7;

Brightness & contrast

Relative luminance0.1069WCAG 2.x, 0 is black and 1 is white
Perceived brightness93 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 6.69:1
Contrast with white6.69:1WCAG normal text: AA
Contrast with black3.14:1WCAG normal text: Fail
Greyscale equivalent#535353
Inverted#E0A748

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#1663BAno red cones; affects about 1% of men; ΔE 8.1 from the original
Deuteranopia#0055B5no green cones; the most common form, about 1% of men; ΔE 2.1 from the original
Tritanopia#006F7Fno blue cones; rare, and affects men and women equally; ΔE 54.6 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text6.69:1WCAG large text: AAA
Contrast with black, large text3.14:1WCAG large text: AA

Named colours

Royal blue · ΔE 15.8Dark slateblue · ΔE 17.7Slate blue · ΔE 19.6Dodgerblue · ΔE 23.2Cornflower blue · ΔE 25.1Medium purple · ΔE 25.5
Nearest named CSS colourRoyal blue (#4169E1)ΔE 15.79, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#B77E1F
Analogous#1FA4B7, #321FB7
Triadic#B71F58, #58B71F
Split complementary#B7321F, #A4B71F
Tetradic#B71FA4, #B77E1F, #1FB732

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#B0C9F2
Lighter +30%#85ABEA
Lighter +20%#598DE3
Lighter +10%#2D6FDC
Darker −10%#18438B
Darker −20%#102E60
Darker −30%#091934
Darker −40%#010409
More saturated +25%#0451D2
Less saturated −25%#3A5F9C

Channel breakdown

R31
G88
B183
Red31 (12.2%)
Green88 (34.5%)
Blue183 (71.8%)
Hue217.5°
Saturation (HSL)71.03%
Lightness41.96%
Dominant channelBlue
Hex per channelR 1F · G 58 · B B7

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Every value on this page was computed from “1f58b7” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.