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Recognised as Colour

#21217D

  • #21217D
  • Blue
  • Dark
  • Nearest: Midnight blue

#21217D is a blue with RGB values 33, 33, 125 and HSL 240°, 58%, 31%. It is a dark colour, so white text on it reaches 13.3:1 contrast (AAA for normal text). The nearest named colour is Midnight blue.

Colour values

#21217D#21217D
HEX#21217D
RGBrgb(33, 33, 125)
RGB (0–1)0.1294, 0.1294, 0.4902
RGB percentages12.9%, 12.9%, 49%
HSLhsl(240, 58.2%, 31%)
HSV / HSBhsv(240, 73.6%, 49%)
CMYK73.6%, 73.6%, 0%, 51%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,171,261
CSS custom property--colour: #21217D;

Brightness & contrast

Relative luminance0.02892WCAG 2.x, 0 is black and 1 is white
Perceived brightness52.4 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 13.31:1
Contrast with white13.31:1WCAG normal text: AAA
Contrast with black1.58:1WCAG normal text: Fail
Greyscale equivalent#282828
Inverted#DEDE82

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#003480no red cones; affects about 1% of men; ΔE 15.9 from the original
Deuteranopia#002B7Bno green cones; the most common form, about 1% of men; ΔE 10.7 from the original
Tritanopia#003B4Cno blue cones; rare, and affects men and women equally; ΔE 56.1 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text13.31:1WCAG large text: AAA
Contrast with black, large text1.58:1WCAG large text: Fail

Named colours

Midnight blue · ΔE 4.4Dark slateblue · ΔE 16.1Rebecca purple · ΔE 17.6Indigo · ΔE 19.5Navy · ΔE 21.1Dark blue · ΔE 25.3
Nearest named CSS colourMidnight blue (#191970)ΔE 4.36, a close match
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#7D7D21
Analogous#214F7D, #4F217D
Triadic#7D2121, #217D21
Split complementary#7D4F21, #4F7D21
Tetradic#7D214F, #7D7D21, #217D4F

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#8A8AE0
Lighter +30%#6262D5
Lighter +20%#3939CB
Lighter +10%#2C2CA5
Darker −10%#161655
Darker −20%#0C0C2C
Darker −30%#010104
Darker −40%#000000
More saturated +25%#0D0D91
Less saturated −25%#353569

Channel breakdown

R33
G33
B125
Red33 (12.9%)
Green33 (12.9%)
Blue125 (49%)
Hue240°
Saturation (HSL)58.23%
Lightness30.98%
Dominant channelBlue
Hex per channelR 21 · G 21 · B 7D

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Every value on this page was computed from “21217d” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.