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Recognised as Colour

#2557A1

  • #2557A1
  • Blue
  • Dark
  • Nearest: Dark slateblue

#2557A1 is a blue with RGB values 37, 87, 161 and HSL 216°, 63%, 39%. It is a dark colour, so white text on it reaches 7.1:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#2557A1#2557A1
HEX#2557A1
RGBrgb(37, 87, 161)
RGB (0–1)0.1451, 0.3412, 0.6314
RGB percentages14.5%, 34.1%, 63.1%
HSLhsl(215.8, 62.6%, 38.8%)
HSV / HSBhsv(215.8, 77%, 63.1%)
CMYK77%, 46%, 0%, 36.9%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,447,265
CSS custom property--colour: #2557A1;

Brightness & contrast

Relative luminance0.09783WCAG 2.x, 0 is black and 1 is white
Perceived brightness88.4 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 7.1:1
Contrast with white7.1:1WCAG normal text: AAA
Contrast with black2.96:1WCAG normal text: Fail
Greyscale equivalent#525252
Inverted#DAA85E

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#305EA4no red cones; affects about 1% of men; ΔE 4.1 from the original
Deuteranopia#1553A0no green cones; the most common form, about 1% of men; ΔE 2.8 from the original
Tritanopia#006974no blue cones; rare, and affects men and women equally; ΔE 44.6 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text7.1:1WCAG large text: AAA
Contrast with black, large text2.96:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 17.3Steel blue · ΔE 24.4Cornflower blue · ΔE 24.9Royal blue · ΔE 27.9Dodgerblue · ΔE 28.7Slate blue · ΔE 29.8
Nearest named CSS colourDark slateblue (#483D8B)ΔE 17.31, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#A16F25
Analogous#2595A1, #3125A1
Triadic#A12557, #57A125
Split complementary#A13125, #95A125
Tetradic#A12595, #A16F25, #25A131

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#A7C2EB
Lighter +30%#7EA6E1
Lighter +20%#5489D8
Lighter +10%#2F6DCA
Darker −10%#1B4178
Darker −20%#122A4E
Darker −30%#081425
Darker −40%#000000
More saturated +25%#0C52BA
Less saturated −25%#3E5C88

Channel breakdown

R37
G87
B161
Red37 (14.5%)
Green87 (34.1%)
Blue161 (63.1%)
Hue215.81°
Saturation (HSL)62.63%
Lightness38.82%
Dominant channelBlue
Hex per channelR 25 · G 57 · B A1

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Every value on this page was computed from “2557a1” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.