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Recognised as Colour

#21306F

  • #21306F
  • Blue
  • Dark
  • Nearest: Dark slateblue

#21306F is a blue with RGB values 33, 48, 111 and HSL 228°, 54%, 28%. It is a dark colour, so white text on it reaches 12.2:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#21306F#21306F
HEX#21306F
RGBrgb(33, 48, 111)
RGB (0–1)0.1294, 0.1882, 0.4353
RGB percentages12.9%, 18.8%, 43.5%
HSLhsl(228.5, 54.2%, 28.2%)
HSV / HSBhsv(228.5, 70.3%, 43.5%)
CMYK70.3%, 56.8%, 0%, 56.5%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,175,087
CSS custom property--colour: #21306F;

Brightness & contrast

Relative luminance0.03585WCAG 2.x, 0 is black and 1 is white
Perceived brightness55.5 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 12.23:1
Contrast with white12.23:1WCAG normal text: AAA
Contrast with black1.72:1WCAG normal text: Fail
Greyscale equivalent#313131
Inverted#DECF90

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#033971no red cones; affects about 1% of men; ΔE 9.4 from the original
Deuteranopia#00326Eno green cones; the most common form, about 1% of men; ΔE 5.6 from the original
Tritanopia#003F4Ano blue cones; rare, and affects men and women equally; ΔE 40.3 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text12.23:1WCAG large text: AAA
Contrast with black, large text1.72:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 13.2Midnight blue · ΔE 19.7Rebecca purple · ΔE 29.6Slate blue · ΔE 35.8Steel blue · ΔE 37.2Indigo · ΔE 38
Nearest named CSS colourDark slateblue (#483D8B)ΔE 13.18, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#6F6021
Analogous#21576F, #39216F
Triadic#6F2130, #306F21
Split complementary#6F3921, #576F21
Tetradic#6F2157, #6F6021, #216F39

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#8293DA
Lighter +30%#5B71CE
Lighter +20%#3852BE
Lighter +10%#2D4196
Darker −10%#151F48
Darker −20%#0A0E20
Darker −30%#000000
Darker −40%#000000
More saturated +25%#0F2581
Less saturated −25%#333B5D

Channel breakdown

R33
G48
B111
Red33 (12.9%)
Green48 (18.8%)
Blue111 (43.5%)
Hue228.46°
Saturation (HSL)54.17%
Lightness28.24%
Dominant channelBlue
Hex per channelR 21 · G 30 · B 6F

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Every value on this page was computed from “21306f” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.