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Colour

#21397D

  • #21397D
  • Blue
  • Dark
  • Nearest: Dark slateblue

#21397D is a blue with RGB values 33, 57, 125 and HSL 224°, 58%, 31%. It is a dark colour, so white text on it reaches 10.8:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#21397D#21397D
HEX#21397D
RGBrgb(33, 57, 125)
RGB (0–1)0.1294, 0.2235, 0.4902
RGB percentages12.9%, 22.4%, 49%
HSLhsl(224.3, 58.2%, 31%)
HSV / HSBhsv(224.3, 73.6%, 49%)
CMYK73.6%, 54.4%, 0%, 51%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,177,405
CSS custom property--colour: #21397D;

Brightness & contrast

Relative luminance0.0473WCAG 2.x, 0 is black and 1 is white
Perceived brightness63.4 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 10.79:1
Contrast with white10.79:1WCAG normal text: AAA
Contrast with black1.95:1WCAG normal text: Fail
Greyscale equivalent#393939
Inverted#DEC682

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#0B427Fno red cones; affects about 1% of men; ΔE 8.5 from the original
Deuteranopia#00397Cno green cones; the most common form, about 1% of men; ΔE 3.9 from the original
Tritanopia#004955no blue cones; rare, and affects men and women equally; ΔE 42.2 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text10.79:1WCAG large text: AAA
Contrast with black, large text1.95:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 11.3Midnight blue · ΔE 20.5Rebecca purple · ΔE 28.4Slate blue · ΔE 32.4Royal blue · ΔE 34Steel blue · ΔE 34.5
Nearest named CSS colourDark slateblue (#483D8B)ΔE 11.26, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#7D6521
Analogous#21677D, #37217D
Triadic#7D2139, #397D21
Split complementary#7D3721, #677D21
Tetradic#7D2167, #7D6521, #217D37

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#8AA0E0
Lighter +30%#6280D5
Lighter +20%#395FCB
Lighter +10%#2C4BA5
Darker −10%#162755
Darker −20%#0C142C
Darker −30%#010204
Darker −40%#000000
More saturated +25%#0D3091
Less saturated −25%#354269

Channel breakdown

R33
G57
B125
Red33 (12.9%)
Green57 (22.4%)
Blue125 (49%)
Hue224.35°
Saturation (HSL)58.23%
Lightness30.98%
Dominant channelBlue
Hex per channelR 21 · G 39 · B 7D

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Every value on this page was computed from “21397d” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.