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Recognised as Colour

#577C91

  • #577C91
  • Blue
  • Dark
  • Nearest: Slate grey

#577C91 is a blue with RGB values 87, 124, 145 and HSL 202°, 25%, 45%. It is a dark colour, so black text on it reaches 4.7:1 contrast (AA for normal text). The nearest named colour is Slate grey.

Colour values

#577C91#577C91
HEX#577C91
RGBrgb(87, 124, 145)
RGB (0–1)0.3412, 0.4863, 0.5686
RGB percentages34.1%, 48.6%, 56.9%
HSLhsl(201.7, 25%, 45.5%)
HSV / HSBhsv(201.7, 40%, 56.9%)
CMYK40%, 14.5%, 0%, 43.1%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer5,733,521
CSS custom property--colour: #577C91;

Brightness & contrast

Relative luminance0.18486WCAG 2.x, 0 is black and 1 is white
Perceived brightness117 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 4.7:1
Contrast with white4.47:1WCAG normal text: Fail
Contrast with black4.7:1WCAG normal text: AA
Greyscale equivalent#767676
Inverted#A8836E

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#727B92no red cones; affects about 1% of men; ΔE 9.6 from the original
Deuteranopia#6A7491no green cones; the most common form, about 1% of men; ΔE 10.7 from the original
Tritanopia#418283no blue cones; rare, and affects men and women equally; ΔE 15.6 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text4.47:1WCAG large text: AA
Contrast with black, large text4.7:1WCAG large text: AAA

Named colours

Slate grey · ΔE 7.7Light slate grey · ΔE 8.9Steel blue · ΔE 17.2Gray · ΔE 17.5Dim grey · ΔE 18Cadetblue · ΔE 18.4
Nearest named CSS colourSlate grey (#708090)ΔE 7.65, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#916C57
Analogous#579189, #575F91
Triadic#91577C, #7C9157
Split complementary#91575F, #918957
Tetradic#895791, #916C57, #5F9157

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#D1DDE3
Lighter +30%#B1C5D0
Lighter +20%#91ADBD
Lighter +10%#7195AA
Darker −10%#446171
Darker −20%#314551
Darker −30%#1E2A31
Darker −40%#0B0F12
More saturated +25%#3A84AE
Less saturated −25%#747474

Channel breakdown

R87
G124
B145
Red87 (34.1%)
Green124 (48.6%)
Blue145 (56.9%)
Hue201.72°
Saturation (HSL)25%
Lightness45.49%
Dominant channelBlue
Hex per channelR 57 · G 7C · B 91

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Every value on this page was computed from “577c91” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.