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Recognised as Colour

#1F2357

  • #1F2357
  • Blue
  • Dark
  • Nearest: Dark slateblue

#1F2357 is a blue with RGB values 31, 35, 87 and HSL 236°, 47%, 23%. It is a dark colour, so white text on it reaches 14.6:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#1F2357#1F2357
HEX#1F2357
RGBrgb(31, 35, 87)
RGB (0–1)0.1216, 0.1373, 0.3412
RGB percentages12.2%, 13.7%, 34.1%
HSLhsl(235.7, 47.5%, 23.1%)
HSV / HSBhsv(235.7, 64.4%, 34.1%)
CMYK64.4%, 59.8%, 0%, 65.9%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,040,663
CSS custom property--colour: #1F2357;

Brightness & contrast

Relative luminance0.02181WCAG 2.x, 0 is black and 1 is white
Perceived brightness43.2 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 14.62:1
Contrast with white14.62:1WCAG normal text: AAA
Contrast with black1.44:1WCAG normal text: Fail
Greyscale equivalent#262626
Inverted#E0DCA8

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#012B59no red cones; affects about 1% of men; ΔE 9.6 from the original
Deuteranopia#002656no green cones; the most common form, about 1% of men; ΔE 7.2 from the original
Tritanopia#002F39no blue cones; rare, and affects men and women equally; ΔE 34.5 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text14.62:1WCAG large text: AAA
Contrast with black, large text1.44:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 20.1Midnight blue · ΔE 23.3Rebecca purple · ΔE 34.7Black · ΔE 39.6Steel blue · ΔE 41.4Indigo · ΔE 41.4
Nearest named CSS colourDark slateblue (#483D8B)ΔE 20.05, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#57531F
Analogous#1F3F57, #371F57
Triadic#571F23, #23571F
Split complementary#57371F, #3F571F
Tetradic#571F3F, #57531F, #1F5737

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#747BCE
Lighter +30%#4F57C0
Lighter +20%#3A41A2
Lighter +10%#2C327D
Darker −10%#121431
Darker −20%#04050C
Darker −30%#000000
Darker −40%#000000
More saturated +25%#101666
Less saturated −25%#2E3048

Channel breakdown

R31
G35
B87
Red31 (12.2%)
Green35 (13.7%)
Blue87 (34.1%)
Hue235.71°
Saturation (HSL)47.46%
Lightness23.14%
Dominant channelBlue
Hex per channelR 1F · G 23 · B 57

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Every value on this page was computed from “1f2357” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.