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Recognised as Colour

#255DB5

  • #255DB5
  • Blue
  • Dark
  • Nearest: Dark slateblue

#255DB5 is a blue with RGB values 37, 93, 181 and HSL 217°, 66%, 43%. It is a dark colour, so white text on it reaches 6.3:1 contrast (AA for normal text). The nearest named colour is Dark slateblue.

Colour values

#255DB5#255DB5
HEX#255DB5
RGBrgb(37, 93, 181)
RGB (0–1)0.1451, 0.3647, 0.7098
RGB percentages14.5%, 36.5%, 71%
HSLhsl(216.7, 66.1%, 42.7%)
HSV / HSBhsv(216.7, 79.6%, 71%)
CMYK79.6%, 48.6%, 0%, 29%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,448,821
CSS custom property--colour: #255DB5;

Brightness & contrast

Relative luminance0.11558WCAG 2.x, 0 is black and 1 is white
Perceived brightness96 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 6.34:1
Contrast with white6.34:1WCAG normal text: AA
Contrast with black3.31:1WCAG normal text: Fail
Greyscale equivalent#575757
Inverted#DAA24A

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#2A66B8no red cones; affects about 1% of men; ΔE 5.9 from the original
Deuteranopia#0059B3no green cones; the most common form, about 1% of men; ΔE 2.9 from the original
Tritanopia#007280no blue cones; rare, and affects men and women equally; ΔE 51.2 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text6.34:1WCAG large text: AAA
Contrast with black, large text3.31:1WCAG large text: AA

Named colours

Dark slateblue · ΔE 18.2Royal blue · ΔE 19.5Cornflower blue · ΔE 22.1Dodgerblue · ΔE 22.5Slate blue · ΔE 23.2Medium purple · ΔE 26.9
Nearest named CSS colourDark slateblue (#483D8B)ΔE 18.16, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#B57D25
Analogous#25A5B5, #3525B5
Triadic#B5255D, #5DB525
Split complementary#B53525, #A5B525
Tetradic#B525A5, #B57D25, #25B535

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#B6CDF0
Lighter +30%#8CAFE7
Lighter +20%#6192DF
Lighter +10%#3775D6
Darker −10%#1C478B
Darker −20%#143160
Darker −30%#0B1C36
Darker −40%#02060C
More saturated +25%#0A57D0
Less saturated −25%#40639A

Channel breakdown

R37
G93
B181
Red37 (14.5%)
Green93 (36.5%)
Blue181 (71%)
Hue216.67°
Saturation (HSL)66.06%
Lightness42.75%
Dominant channelBlue
Hex per channelR 25 · G 5D · B B5

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Every value on this page was computed from “255db5” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.