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Recognised as Colour

#2580B8

  • #2580B8
  • Blue
  • Dark
  • Nearest: Steel blue

#2580B8 is a blue with RGB values 37, 128, 184 and HSL 203°, 67%, 43%. It is a dark colour, so black text on it reaches 4.9:1 contrast (AA for normal text). The nearest named colour is Steel blue.

Colour values

#2580B8#2580B8
HEX#2580B8
RGBrgb(37, 128, 184)
RGB (0–1)0.1451, 0.502, 0.7216
RGB percentages14.5%, 50.2%, 72.2%
HSLhsl(202.9, 66.5%, 43.3%)
HSV / HSBhsv(202.9, 79.9%, 72.2%)
CMYK79.9%, 30.4%, 0%, 27.8%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,457,784
CSS custom property--colour: #2580B8;

Brightness & contrast

Relative luminance0.19292WCAG 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 4.86:1
Contrast with white4.32:1WCAG normal text: Fail
Contrast with black4.86:1WCAG normal text: AA
Greyscale equivalent#717171
Inverted#DA7F47

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#6681BAno red cones; affects about 1% of men; ΔE 13.2 from the original
Deuteranopia#5174B7no green cones; the most common form, about 1% of men; ΔE 14.4 from the original
Tritanopia#008E94no blue cones; rare, and affects men and women equally; ΔE 33.5 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text4.32:1WCAG large text: AA
Contrast with black, large text4.86:1WCAG large text: AAA

Named colours

Steel blue · ΔE 5.4Cornflower blue · ΔE 22.9Deep skyblue · ΔE 24.9Light slate grey · ΔE 26.5Slate grey · ΔE 26.7Light skyblue · ΔE 30.2
Nearest named CSS colourSteel blue (#4682B4)ΔE 5.41, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#B85D25
Analogous#25B8A7, #2536B8
Triadic#B82580, #80B825
Split complementary#B82536, #B8A725
Tetradic#A725B8, #B85D25, #36B825

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#B8DBF1
Lighter +30%#8EC6E8
Lighter +20%#63B0E0
Lighter +10%#399BD7
Darker −10%#1C628E
Darker −20%#144563
Darker −30%#0B2739
Darker −40%#030A0E
More saturated +25%#0987D4
Less saturated −25%#41799C

Channel breakdown

R37
G128
B184
Red37 (14.5%)
Green128 (50.2%)
Blue184 (72.2%)
Hue202.86°
Saturation (HSL)66.52%
Lightness43.33%
Dominant channelBlue
Hex per channelR 25 · G 80 · B B8

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Every value on this page was computed from “2580b8” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.