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Recognised as Colour

#2156CB

  • #2156CB
  • Blue
  • Dark
  • Nearest: Royal blue

#2156CB is a blue with RGB values 33, 86, 203 and HSL 221°, 72%, 46%. It is a dark colour, so white text on it reaches 6.4:1 contrast (AA for normal text). The nearest named colour is Royal blue.

Colour values

#2156CB#2156CB
HEX#2156CB
RGBrgb(33, 86, 203)
RGB (0–1)0.1294, 0.3373, 0.7961
RGB percentages12.9%, 33.7%, 79.6%
HSLhsl(221.3, 72%, 46.3%)
HSV / HSBhsv(221.3, 83.7%, 79.6%)
CMYK83.7%, 57.6%, 0%, 20.4%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,184,907
CSS custom property--colour: #2156CB;

Brightness & contrast

Relative luminance0.11291WCAG 2.x, 0 is black and 1 is white
Perceived brightness96.8 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 6.45:1
Contrast with white6.45:1WCAG normal text: AA
Contrast with black3.26:1WCAG normal text: Fail
Greyscale equivalent#535353
Inverted#DEA934

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#0066CFno red cones; affects about 1% of men; ΔE 12.1 from the original
Deuteranopia#0057C9no green cones; the most common form, about 1% of men; ΔE 3.1 from the original
Tritanopia#007488no blue cones; rare, and affects men and women equally; ΔE 66.3 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text6.45:1WCAG large text: AAA
Contrast with black, large text3.26:1WCAG large text: AA

Named colours

Royal blue · ΔE 7.8Slate blue · ΔE 13Medium slateblue · ΔE 18.6Medium purple · ΔE 23.5Dark slateblue · ΔE 25.1Rebecca purple · ΔE 25.3
Nearest named CSS colourRoyal blue (#4169E1)ΔE 7.8, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#CB9621
Analogous#21ABCB, #4121CB
Triadic#CB2156, #56CB21
Split complementary#CB4121, #ABCB21
Tetradic#CB21AB, #CB9621, #21CB41

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#C3D3F5
Lighter +30%#97B2EE
Lighter +20%#6B92E7
Lighter +10%#3F71E0
Darker −10%#1A439F
Darker −20%#133173
Darker −30%#0C1E47
Darker −40%#040C1C
More saturated +25%#044BE8
Less saturated −25%#3E61AE

Channel breakdown

R33
G86
B203
Red33 (12.9%)
Green86 (33.7%)
Blue203 (79.6%)
Hue221.29°
Saturation (HSL)72.03%
Lightness46.27%
Dominant channelBlue
Hex per channelR 21 · G 56 · B CB

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Every value on this page was computed from “2156cb” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.