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Recognised as Colour

#4280FF

  • #4280FF
  • Blue
  • Dark
  • Nearest: Royal blue

#4280FF is a blue with RGB values 66, 128, 255 and HSL 220°, 100%, 63%. It is a dark colour, so black text on it reaches 5.8:1 contrast (AA for normal text). The nearest named colour is Royal blue.

Colour values

#4280FF#4280FF
HEX#4280FF
RGBrgb(66, 128, 255)
RGB (0–1)0.2588, 0.502, 1
RGB percentages25.9%, 50.2%, 100%
HSLhsl(220.3, 100%, 62.9%)
HSV / HSBhsv(220.3, 74.1%, 100%)
CMYK74.1%, 49.8%, 0%, 0%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer4,358,399
CSS custom property--colour: #4280FF;

Brightness & contrast

Relative luminance0.23817WCAG 2.x, 0 is black and 1 is white
Perceived brightness135.4 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 5.76:1
Contrast with white3.64:1WCAG normal text: Fail
Contrast with black5.76:1WCAG normal text: AA
Greyscale equivalent#7C7C7C
Inverted#BD7F00

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#318FFFno red cones; affects about 1% of men; ΔE 12.8 from the original
Deuteranopia#007EFCno green cones; the most common form, about 1% of men; ΔE 4.6 from the original
Tritanopia#009EB3no blue cones; rare, and affects men and women equally; ΔE 69.3 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text3.64:1WCAG large text: AA
Contrast with black, large text5.76:1WCAG large text: AAA

Named colours

Royal blue · ΔE 9.5Dodgerblue · ΔE 14.4Medium slateblue · ΔE 19Slate blue · ΔE 20.3Medium purple · ΔE 23.5Cornflower blue · ΔE 24.6
Nearest named CSS colourRoyal blue (#4169E1)ΔE 9.52, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#FFC142
Analogous#42DEFF, #6342FF
Triadic#FF4280, #80FF42
Split complementary#FF6342, #DEFF42
Tetradic#FF42DE, #FFC142, #42FF63

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#FFFFFF
Lighter +30%#DBE7FF
Lighter +20%#A8C5FF
Lighter +10%#75A2FF
Darker −10%#0F5EFF
Darker −20%#0048DB
Darker −30%#0037A8
Darker −40%#002675
More saturated +25%#4280FF
Less saturated −25%#5A88E7

Channel breakdown

R66
G128
B255
Red66 (25.9%)
Green128 (50.2%)
Blue255 (100%)
Hue220.32°
Saturation (HSL)100%
Lightness62.94%
Dominant channelBlue
Hex per channelR 42 · G 80 · B FF

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Every value on this page was computed from “4280ff” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.