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Recognised as Colour

#4280A1

  • #4280A1
  • Blue
  • Dark
  • Nearest: Steel blue

#4280A1 is a blue with RGB values 66, 128, 161 and HSL 201°, 42%, 45%. It is a dark colour, so black text on it reaches 4.8:1 contrast (AA for normal text). The nearest named colour is Steel blue.

Colour values

#4280A1#4280A1
HEX#4280A1
RGBrgb(66, 128, 161)
RGB (0–1)0.2588, 0.502, 0.6314
RGB percentages25.9%, 50.2%, 63.1%
HSLhsl(200.8, 41.9%, 44.5%)
HSV / HSBhsv(200.8, 59%, 63.1%)
CMYK59%, 20.5%, 0%, 36.9%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer4,358,305
CSS custom property--colour: #4280A1;

Brightness & contrast

Relative luminance0.1917WCAG 2.x, 0 is black and 1 is white
Perceived brightness117.8 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 4.83:1
Contrast with white4.34:1WCAG normal text: Fail
Contrast with black4.83:1WCAG normal text: AA
Greyscale equivalent#757575
Inverted#BD7F5E

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#707FA3no red cones; affects about 1% of men; ΔE 13.7 from the original
Deuteranopia#6375A0no green cones; the most common form, about 1% of men; ΔE 14.6 from the original
Tritanopia#00898Bno blue cones; rare, and affects men and women equally; ΔE 24 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text4.34:1WCAG large text: AA
Contrast with black, large text4.83:1WCAG large text: AAA

Named colours

Steel blue · ΔE 10.5Slate grey · ΔE 15.4Light slate grey · ΔE 15.6Cadetblue · ΔE 21.5Teal · ΔE 24.4Dark cyan · ΔE 25.4
Nearest named CSS colourSteel blue (#4682B4)ΔE 10.46, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#A16342
Analogous#42A193, #4250A1
Triadic#A14280, #80A142
Split complementary#A14250, #A19342
Tetradic#9342A1, #A16342, #50A142

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#C7DDE8
Lighter +30%#A3C6D9
Lighter +20%#7FB0CA
Lighter +10%#5A9ABC
Darker −10%#33637D
Darker −20%#244659
Darker −30%#162A34
Darker −40%#070D10
More saturated +25%#2689BD
Less saturated −25%#5E7785

Channel breakdown

R66
G128
B161
Red66 (25.9%)
Green128 (50.2%)
Blue161 (63.1%)
Hue200.84°
Saturation (HSL)41.85%
Lightness44.51%
Dominant channelBlue
Hex per channelR 42 · G 80 · B A1

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Every value on this page was computed from “4280a1” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.