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Recognised as Colour

#2558BB

  • #2558BB
  • Blue
  • Dark
  • Nearest: Royal blue

#2558BB is a blue with RGB values 37, 88, 187 and HSL 220°, 67%, 44%. It is a dark colour, so white text on it reaches 6.6:1 contrast (AA for normal text). The nearest named colour is Royal blue.

Colour values

#2558BB#2558BB
HEX#2558BB
RGBrgb(37, 88, 187)
RGB (0–1)0.1451, 0.3451, 0.7333
RGB percentages14.5%, 34.5%, 73.3%
HSLhsl(219.6, 67%, 43.9%)
HSV / HSBhsv(219.6, 80.2%, 73.3%)
CMYK80.2%, 52.9%, 0%, 26.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,447,547
CSS custom property--colour: #2558BB;

Brightness & contrast

Relative luminance0.10961WCAG 2.x, 0 is black and 1 is white
Perceived brightness94.6 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 6.58:1
Contrast with white6.58:1WCAG normal text: AA
Contrast with black3.19:1WCAG normal text: Fail
Greyscale equivalent#545454
Inverted#DAA744

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#0C64BFno red cones; affects about 1% of men; ΔE 9.1 from the original
Deuteranopia#0057B9no green cones; the most common form, about 1% of men; ΔE 2.7 from the original
Tritanopia#007081no blue cones; rare, and affects men and women equally; ΔE 56.7 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text6.58:1WCAG large text: AAA
Contrast with black, large text3.19:1WCAG large text: AA

Named colours

Royal blue · ΔE 13.4Slate blue · ΔE 17.3Dark slateblue · ΔE 18.3Dodgerblue · ΔE 23.1Medium purple · ΔE 24Cornflower blue · ΔE 25.9
Nearest named CSS colourRoyal blue (#4169E1)ΔE 13.43, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#BB8825
Analogous#25A3BB, #3D25BB
Triadic#BB2558, #58BB25
Split complementary#BB3D25, #A3BB25
Tetradic#BB25A3, #BB8825, #25BB3D

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#BBCDF1
Lighter +30%#90AEE9
Lighter +20%#658FE1
Lighter +10%#3B70D8
Darker −10%#1D4490
Darker −20%#143066
Darker −30%#0C1C3B
Darker −40%#030811
More saturated +25%#094FD7
Less saturated −25%#41619F

Channel breakdown

R37
G88
B187
Red37 (14.5%)
Green88 (34.5%)
Blue187 (73.3%)
Hue219.6°
Saturation (HSL)66.96%
Lightness43.92%
Dominant channelBlue
Hex per channelR 25 · G 58 · B BB

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Every value on this page was computed from “2558bb” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.