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Recognised as Colour

#377CA5

  • #377CA5
  • Blue
  • Dark
  • Nearest: Steel blue

#377CA5 is a blue with RGB values 55, 124, 165 and HSL 202°, 50%, 43%. It is a dark colour, so black text on it reaches 4.6:1 contrast (AA for normal text). The nearest named colour is Steel blue.

Colour values

#377CA5#377CA5
HEX#377CA5
RGBrgb(55, 124, 165)
RGB (0–1)0.2157, 0.4863, 0.6471
RGB percentages21.6%, 48.6%, 64.7%
HSLhsl(202.4, 50%, 43.1%)
HSV / HSBhsv(202.4, 66.7%, 64.7%)
CMYK66.7%, 24.8%, 0%, 35.3%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer3,636,389
CSS custom property--colour: #377CA5;

Brightness & contrast

Relative luminance0.17944WCAG 2.x, 0 is black and 1 is white
Perceived brightness114.2 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 4.59:1
Contrast with white4.58:1WCAG normal text: AA
Contrast with black4.59:1WCAG normal text: AA
Greyscale equivalent#707070
Inverted#C8835A

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#697CA7no red cones; affects about 1% of men; ΔE 13.1 from the original
Deuteranopia#5A71A4no green cones; the most common form, about 1% of men; ΔE 14.2 from the original
Tritanopia#00868Ano blue cones; rare, and affects men and women equally; ΔE 26.6 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text4.58:1WCAG large text: AAA
Contrast with black, large text4.59:1WCAG large text: AAA

Named colours

Steel blue · ΔE 6.6Slate grey · ΔE 19.1Light slate grey · ΔE 19.4Cadetblue · ΔE 26.5Teal · ΔE 28.5Deep skyblue · ΔE 28.7
Nearest named CSS colourSteel blue (#4682B4)ΔE 6.58, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#A56037
Analogous#37A597, #3745A5
Triadic#A5377C, #7CA537
Split complementary#A53745, #A59737
Tetradic#9737A5, #A56037, #45A537

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#BFD9EA
Lighter +30%#98C3DD
Lighter +20%#72ADD0
Lighter +10%#4C97C3
Darker −10%#2A5F7F
Darker −20%#1E4359
Darker −30%#112632
Darker −40%#04090C
More saturated +25%#1C83C1
Less saturated −25%#53758A

Channel breakdown

R55
G124
B165
Red55 (21.6%)
Green124 (48.6%)
Blue165 (64.7%)
Hue202.36°
Saturation (HSL)50%
Lightness43.14%
Dominant channelBlue
Hex per channelR 37 · G 7C · B A5

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Every value on this page was computed from “377ca5” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.