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Recognised as Colour

#21375A

  • #21375A
  • Blue
  • Dark
  • Nearest: Dark slate grey

#21375A is a blue with RGB values 33, 55, 90 and HSL 217°, 46%, 24%. It is a dark colour, so white text on it reaches 11.9:1 contrast (AAA for normal text). The nearest named colour is Dark slate grey.

Colour values

#21375A#21375A
HEX#21375A
RGBrgb(33, 55, 90)
RGB (0–1)0.1294, 0.2157, 0.3529
RGB percentages12.9%, 21.6%, 35.3%
HSLhsl(216.8, 46.3%, 24.1%)
HSV / HSBhsv(216.8, 63.3%, 35.3%)
CMYK63.3%, 38.9%, 0%, 64.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,176,858
CSS custom property--colour: #21375A;

Brightness & contrast

Relative luminance0.03794WCAG 2.x, 0 is black and 1 is white
Perceived brightness55 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 11.94:1
Contrast with white11.94:1WCAG normal text: AAA
Contrast with black1.76:1WCAG normal text: Fail
Greyscale equivalent#353535
Inverted#DEC8A5

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#283A5Bno red cones; affects about 1% of men; ΔE 2.2 from the original
Deuteranopia#213459no green cones; the most common form, about 1% of men; ΔE 2.2 from the original
Tritanopia#003F44no blue cones; rare, and affects men and women equally; ΔE 24.7 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text11.94:1WCAG large text: AAA
Contrast with black, large text1.76:1WCAG large text: Fail

Named colours

Dark slate grey · ΔE 26.4Dark slateblue · ΔE 30.1Steel blue · ΔE 31.6Dim grey · ΔE 32.1Slate grey · ΔE 33.1Black · ΔE 33.2
Nearest named CSS colourDark slate grey (#2F4F4F)ΔE 26.41, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#5A4421
Analogous#21535A, #28215A
Triadic#5A2137, #375A21
Split complementary#5A2821, #535A21
Tetradic#5A2153, #5A4421, #215A28

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#799ACE
Lighter +30%#547EC0
Lighter +20%#3C65A5
Lighter +10%#2F4E7F
Darker −10%#132035
Darker −20%#06090F
Darker −30%#000000
Darker −40%#000000
More saturated +25%#123369
Less saturated −25%#303B4B

Channel breakdown

R33
G55
B90
Red33 (12.9%)
Green55 (21.6%)
Blue90 (35.3%)
Hue216.84°
Saturation (HSL)46.34%
Lightness24.12%
Dominant channelBlue
Hex per channelR 21 · G 37 · B 5A

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Every value on this page was computed from “21375a” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.