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Recognised as Colour

#1F455A

  • #1F455A
  • Blue
  • Dark
  • Nearest: Dark slate grey

#1F455A is a blue with RGB values 31, 69, 90 and HSL 201°, 49%, 24%. It is a dark colour, so white text on it reaches 10.2:1 contrast (AAA for normal text). The nearest named colour is Dark slate grey.

Colour values

#1F455A#1F455A
HEX#1F455A
RGBrgb(31, 69, 90)
RGB (0–1)0.1216, 0.2706, 0.3529
RGB percentages12.2%, 27.1%, 35.3%
HSLhsl(201.4, 48.8%, 23.7%)
HSV / HSBhsv(201.4, 65.6%, 35.3%)
CMYK65.6%, 23.3%, 0%, 64.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,049,370
CSS custom property--colour: #1F455A;

Brightness & contrast

Relative luminance0.05286WCAG 2.x, 0 is black and 1 is white
Perceived brightness63.3 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 10.21:1
Contrast with white10.21:1WCAG normal text: AAA
Contrast with black2.06:1WCAG normal text: Fail
Greyscale equivalent#3E3E3E
Inverted#E0BAA5

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#3B445Bno red cones; affects about 1% of men; ΔE 9.1 from the original
Deuteranopia#333E5Ano green cones; the most common form, about 1% of men; ΔE 10.1 from the original
Tritanopia#004A4Cno blue cones; rare, and affects men and women equally; ΔE 15.9 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text10.21:1WCAG large text: AAA
Contrast with black, large text2.06:1WCAG large text: Fail

Named colours

Dark slate grey · ΔE 14.4Dim grey · ΔE 24.4Slate grey · ΔE 26.3Light slate grey · ΔE 29.2Steel blue · ΔE 29.5Gray · ΔE 31.5
Nearest named CSS colourDark slate grey (#2F4F4F)ΔE 14.4, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#5A341F
Analogous#1F5A51, #1F285A
Triadic#5A1F45, #455A1F
Split complementary#5A1F28, #5A521F
Tetradic#511F5A, #5A341F, #275A1F

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#75AFD0
Lighter +30%#4F9AC3
Lighter +20%#397FA6
Lighter +10%#2C6280
Darker −10%#122834
Darker −20%#050B0E
Darker −30%#000000
Darker −40%#000000
More saturated +25%#104969
Less saturated −25%#2E414B

Channel breakdown

R31
G69
B90
Red31 (12.2%)
Green69 (27.1%)
Blue90 (35.3%)
Hue201.36°
Saturation (HSL)48.76%
Lightness23.73%
Dominant channelBlue
Hex per channelR 1F · G 45 · B 5A

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Every value on this page was computed from “1f455a” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.