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Recognised as Colour

#0051CB

  • #0051CB
  • Blue
  • Dark
  • Nearest: Royal blue

#0051CB is a blue with RGB values 0, 81, 203 and HSL 216°, 100%, 40%. It is a dark colour, so white text on it reaches 6.9:1 contrast (AA for normal text). The nearest named colour is Royal blue.

Colour values

#0051CB#0051CB
HEX#0051CB
RGBrgb(0, 81, 203)
RGB (0–1)0, 0.3176, 0.7961
RGB percentages0%, 31.8%, 79.6%
HSLhsl(216.1, 100%, 39.8%)
HSV / HSBhsv(216.1, 100%, 79.6%)
CMYK100%, 60.1%, 0%, 20.4%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer20,939
CSS custom property--colour: #0051CB;

Brightness & contrast

Relative luminance0.10197WCAG 2.x, 0 is black and 1 is white
Perceived brightness92.5 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 6.91:1
Contrast with white6.91:1WCAG normal text: AA
Contrast with black3.04:1WCAG normal text: Fail
Greyscale equivalent#494949
Inverted#FFAE34

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#0063CFno red cones; affects about 1% of men; ΔE 13.1 from the original
Deuteranopia#0052C9no green cones; the most common form, about 1% of men; ΔE 2 from the original
Tritanopia#007186no blue cones; rare, and affects men and women equally; ΔE 68.8 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text6.91:1WCAG large text: AAA
Contrast with black, large text3.04:1WCAG large text: AA

Named colours

Royal blue · ΔE 10.4Slate blue · ΔE 14.8Medium slateblue · ΔE 18.9Rebecca purple · ΔE 26.1Medium purple · ΔE 26.2Dark slateblue · ΔE 27.5
Nearest named CSS colourRoyal blue (#4169E1)ΔE 10.44, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#CB7A00
Analogous#00B6CB, #1500CB
Triadic#CB0051, #51CB00
Split complementary#CB1500, #B6CB00
Tetradic#CB00B6, #CB7A00, #00CB15

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#98C1FF
Lighter +30%#65A2FF
Lighter +20%#3284FF
Lighter +10%#0065FE
Darker −10%#003D98
Darker −20%#002865
Darker −30%#001432
Darker −40%#000000
More saturated +25%#0051CB
Less saturated −25%#1956B2

Channel breakdown

R0
G81
B203
Red0 (0%)
Green81 (31.8%)
Blue203 (79.6%)
Hue216.06°
Saturation (HSL)100%
Lightness39.8%
Dominant channelBlue
Hex per channelR 00 · G 51 · B CB

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Every value on this page was computed from “0051cb” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.