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Colour

#1F51DC

  • #1F51DC
  • Blue
  • Dark
  • Nearest: Royal blue

#1F51DC is a blue with RGB values 31, 81, 220 and HSL 224°, 75%, 49%. It is a dark colour, so white text on it reaches 6.4:1 contrast (AA for normal text). The nearest named colour is Royal blue.

Colour values

#1F51DC#1F51DC
HEX#1F51DC
RGBrgb(31, 81, 220)
RGB (0–1)0.1216, 0.3176, 0.8627
RGB percentages12.2%, 31.8%, 86.3%
HSLhsl(224.1, 75.3%, 49.2%)
HSV / HSBhsv(224.1, 85.9%, 86.3%)
CMYK85.9%, 63.2%, 0%, 13.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,052,572
CSS custom property--colour: #1F51DC;

Brightness & contrast

Relative luminance0.11343WCAG 2.x, 0 is black and 1 is white
Perceived brightness98.3 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 6.42:1
Contrast with white6.42:1WCAG normal text: AA
Contrast with black3.27:1WCAG normal text: Fail
Greyscale equivalent#505050
Inverted#E0AE23

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#0068E0no red cones; affects about 1% of men; ΔE 17.3 from the original
Deuteranopia#0056D9no green cones; the most common form, about 1% of men; ΔE 6.1 from the original
Tritanopia#00768Fno blue cones; rare, and affects men and women equally; ΔE 76.9 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text6.42:1WCAG large text: AAA
Contrast with black, large text3.27:1WCAG large text: AA

Named colours

Royal blue · ΔE 16Medium slateblue · ΔE 16Slate blue · ΔE 18Medium purple · ΔE 29Rebecca purple · ΔE 29.5Dark blue · ΔE 29.7
Nearest named CSS colourRoyal blue (#4169E1)ΔE 16.05, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#DCAA1F
Analogous#1FB0DC, #4B1FDC
Triadic#DC1F51, #51DC1F
Split complementary#DC4B1F, #B0DC1F
Tetradic#DC1FB0, #DCAA1F, #1FDC4B

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#CFDAF8
Lighter +30%#A2B7F2
Lighter +20%#7595EC
Lighter +10%#4972E5
Darker −10%#1941AF
Darker −20%#123083
Darker −30%#0C2056
Darker −40%#060F29
More saturated +25%#0042FB
Less saturated −25%#3E60BD

Channel breakdown

R31
G81
B220
Red31 (12.2%)
Green81 (31.8%)
Blue220 (86.3%)
Hue224.13°
Saturation (HSL)75.3%
Lightness49.22%
Dominant channelBlue
Hex per channelR 1F · G 51 · B DC

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Every value on this page was computed from “1f51dc” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.