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Recognised as Colour

#51D4FF

  • #51D4FF
  • Cyan
  • Light
  • Nearest: Light skyblue

#51D4FF is a cyan with RGB values 81, 212, 255 and HSL 195°, 100%, 66%. It is a light colour, so black text on it reaches 12.2:1 contrast (AAA for normal text). The nearest named colour is Light skyblue.

Colour values

#51D4FF#51D4FF
HEX#51D4FF
RGBrgb(81, 212, 255)
RGB (0–1)0.3176, 0.8314, 1
RGB percentages31.8%, 83.1%, 100%
HSLhsl(194.8, 100%, 65.9%)
HSV / HSBhsv(194.8, 68.2%, 100%)
CMYK68.2%, 16.9%, 0%, 0%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer5,362,943
CSS custom property--colour: #51D4FF;

Brightness & contrast

Relative luminance0.56056WCAG 2.x, 0 is black and 1 is white
Perceived brightness189.1 of 255ITU-R BT.601 weighting
Light or darkLight
Best text colour on this backgroundBlackcontrast 12.21:1
Contrast with white1.72:1WCAG normal text: Fail
Contrast with black12.21:1WCAG normal text: AAA
Greyscale equivalent#BBBBBB
Inverted#AE2B00

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#BCCFFFno red cones; affects about 1% of men; ΔE 27.4 from the original
Deuteranopia#A4BEFFno green cones; the most common form, about 1% of men; ΔE 29.3 from the original
Tritanopia#00E1E2no blue cones; rare, and affects men and women equally; ΔE 27.7 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text1.72:1WCAG large text: Fail
Contrast with black, large text12.21:1WCAG large text: AAA

Named colours

Light skyblue · ΔE 12.1Sky blue · ΔE 12.8Deep skyblue · ΔE 14.1Light blue · ΔE 23.5Dark turquoise · ΔE 25.4Powder blue · ΔE 25.8
Nearest named CSS colourLight skyblue (#87CEFA)ΔE 12.15, a distinctly different colour
Hue familycyan
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#FF7C51
Analogous#51FFD3, #517DFF
Triadic#FF51D4, #D4FF51
Split complementary#FF517D, #FFD351
Tetradic#D351FF, #FF7C51, #7DFF51

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#FFFFFF
Lighter +30%#EAFAFF
Lighter +20%#B7EDFF
Lighter +10%#84E1FF
Darker −10%#1EC7FF
Darker −20%#00B0EA
Darker −30%#008AB7
Darker −40%#006384
More saturated +25%#51D4FF
Less saturated −25%#67C9E9

Channel breakdown

R81
G212
B255
Red81 (31.8%)
Green212 (83.1%)
Blue255 (100%)
Hue194.83°
Saturation (HSL)100%
Lightness65.88%
Dominant channelBlue
Hex per channelR 51 · G D4 · B FF

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Every value on this page was computed from “51d4ff” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.