Nerdulator> put something in

Recognised as Colour

#1F3151

  • #1F3151
  • Blue
  • Dark
  • Nearest: Dark slate grey

#1F3151 is a blue with RGB values 31, 49, 81 and HSL 218°, 45%, 22%. It is a dark colour, so white text on it reaches 13:1 contrast (AAA for normal text). The nearest named colour is Dark slate grey.

Colour values

#1F3151#1F3151
HEX#1F3151
RGBrgb(31, 49, 81)
RGB (0–1)0.1216, 0.1922, 0.3176
RGB percentages12.2%, 19.2%, 31.8%
HSLhsl(218.4, 44.6%, 22%)
HSV / HSBhsv(218.4, 61.7%, 31.8%)
CMYK61.7%, 39.5%, 0%, 68.2%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,044,241
CSS custom property--colour: #1F3151;

Brightness & contrast

Relative luminance0.03082WCAG 2.x, 0 is black and 1 is white
Perceived brightness49.4 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 12.99:1
Contrast with white12.99:1WCAG normal text: AAA
Contrast with black1.62:1WCAG normal text: Fail
Greyscale equivalent#2F2F2F
Inverted#E0CEAE

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#243452no red cones; affects about 1% of men; ΔE 2.1 from the original
Deuteranopia#1E2F50no green cones; the most common form, about 1% of men; ΔE 1.2 from the original
Tritanopia#00383Dno blue cones; rare, and affects men and women equally; ΔE 23 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text12.99:1WCAG large text: AAA
Contrast with black, large text1.62:1WCAG large text: Fail

Named colours

Dark slate grey · ΔE 26.2Black · ΔE 30.1Dark slateblue · ΔE 31.9Dim grey · ΔE 32.7Steel blue · ΔE 34.6Slate grey · ΔE 34.9
Nearest named CSS colourDark slate grey (#2F4F4F)ΔE 26.2, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#513F1F
Analogous#1F4A51, #261F51
Triadic#511F31, #31511F
Split complementary#51261F, #4A511F
Tetradic#511F4A, #513F1F, #1F5126

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#7392C9
Lighter +30%#4E75BB
Lighter +20%#3B5E9B
Lighter +10%#2D4776
Darker −10%#111B2C
Darker −20%#030407
Darker −30%#000000
Darker −40%#000000
More saturated +25%#112D5F
Less saturated −25%#2D3543

Channel breakdown

R31
G49
B81
Red31 (12.2%)
Green49 (19.2%)
Blue81 (31.8%)
Hue218.4°
Saturation (HSL)44.64%
Lightness21.96%
Dominant channelBlue
Hex per channelR 1F · G 31 · B 51

Keep nerding

Every link below is a page Nerdulator can generate from what it already knows about this value.

Nerdulate something else

Nothing in mind? Surprise me · today’s page

Every value on this page was computed from “1f3151” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.