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Recognised as Colour

#51ACDD

  • #51ACDD
  • Blue
  • Dark
  • Nearest: Deep skyblue

#51ACDD is a blue with RGB values 81, 172, 221 and HSL 201°, 67%, 59%. It is a dark colour, so black text on it reaches 8.3:1 contrast (AAA for normal text). The nearest named colour is Deep skyblue.

Colour values

#51ACDD#51ACDD
HEX#51ACDD
RGBrgb(81, 172, 221)
RGB (0–1)0.3176, 0.6745, 0.8667
RGB percentages31.8%, 67.5%, 86.7%
HSLhsl(201, 67.3%, 59.2%)
HSV / HSBhsv(201, 63.3%, 86.7%)
CMYK63.3%, 22.2%, 0%, 13.3%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer5,352,669
CSS custom property--colour: #51ACDD;

Brightness & contrast

Relative luminance0.36475WCAG 2.x, 0 is black and 1 is white
Perceived brightness157.8 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 8.29:1
Contrast with white2.53:1WCAG normal text: Fail
Contrast with black8.29:1WCAG normal text: AAA
Greyscale equivalent#9C9C9C
Inverted#AE5322

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#95ABDFno red cones; affects about 1% of men; ΔE 17.7 from the original
Deuteranopia#819CDCno green cones; the most common form, about 1% of men; ΔE 19.5 from the original
Tritanopia#00B9BCno blue cones; rare, and affects men and women equally; ΔE 31.8 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text2.53:1WCAG large text: Fail
Contrast with black, large text8.29:1WCAG large text: AAA

Named colours

Deep skyblue · ΔE 12.5Light skyblue · ΔE 13.6Steel blue · ΔE 16.6Sky blue · ΔE 17Light steelblue · ΔE 23.8Light slate grey · ΔE 26.3
Nearest named CSS colourDeep skyblue (#00BFFF)ΔE 12.47, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#DD8251
Analogous#51DDC8, #5166DD
Triadic#DD51AC, #ACDD51
Split complementary#DD5166, #DDC851
Tetradic#C851DD, #DD8251, #66DD51

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#FCFDFE
Lighter +30%#D1E9F6
Lighter +20%#A6D5EE
Lighter +10%#7CC0E5
Darker −10%#2997D2
Darker −20%#2178A7
Darker −30%#185A7D
Darker −40%#103B52
More saturated +25%#37B4F7
Less saturated −25%#6BA4C3

Channel breakdown

R81
G172
B221
Red81 (31.8%)
Green172 (67.5%)
Blue221 (86.7%)
Hue201°
Saturation (HSL)67.31%
Lightness59.22%
Dominant channelBlue
Hex per channelR 51 · G AC · B DD

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