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Recognised as Colour

#42575A

  • #42575A
  • Cyan
  • Dark
  • Nearest: Dark slate grey

#42575A is a cyan with RGB values 66, 87, 90 and HSL 188°, 15%, 31%. It is a dark colour, so white text on it reaches 7.7:1 contrast (AAA for normal text). The nearest named colour is Dark slate grey.

Colour values

#42575A#42575A
HEX#42575A
RGBrgb(66, 87, 90)
RGB (0–1)0.2588, 0.3412, 0.3529
RGB percentages25.9%, 34.1%, 35.3%
HSLhsl(187.5, 15.4%, 30.6%)
HSV / HSBhsv(187.5, 26.7%, 35.3%)
CMYK26.7%, 3.3%, 0%, 64.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer4,347,738
CSS custom property--colour: #42575A;

Brightness & contrast

Relative luminance0.08713WCAG 2.x, 0 is black and 1 is white
Perceived brightness81.7 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 7.66:1
Contrast with white7.66:1WCAG normal text: AAA
Contrast with black2.74:1WCAG normal text: Fail
Greyscale equivalent#535353
Inverted#BDA8A5

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#54555Ano red cones; affects about 1% of men; ΔE 8.1 from the original
Deuteranopia#4F525Ano green cones; the most common form, about 1% of men; ΔE 7.9 from the original
Tritanopia#3A5958no blue cones; rare, and affects men and women equally; ΔE 4.6 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text7.66:1WCAG large text: AAA
Contrast with black, large text2.74:1WCAG large text: Fail

Named colours

Dark slate grey · ΔE 6.2Dim grey · ΔE 12.3Slate grey · ΔE 19.2Gray · ΔE 20Light slate grey · ΔE 22.1Teal · ΔE 25.5
Nearest named CSS colourDark slate grey (#2F4F4F)ΔE 6.18, clearly different but related
Hue familycyan
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#5A4542
Analogous#425A51, #424B5A
Triadic#5A4257, #575A42
Split complementary#5A424B, #5A5142
Tetradic#51425A, #5A4542, #4B5A42

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#A8BDC0
Lighter +30%#8BA6AA
Lighter +20%#6E9094
Lighter +10%#587377
Darker −10%#2C3B3D
Darker −20%#171E1F
Darker −30%#010202
Darker −40%#000000
More saturated +25%#2F666E
Less saturated −25%#4E4E4E

Channel breakdown

R66
G87
B90
Red66 (25.9%)
Green87 (34.1%)
Blue90 (35.3%)
Hue187.5°
Saturation (HSL)15.38%
Lightness30.59%
Dominant channelBlue
Hex per channelR 42 · G 57 · B 5A

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Every value on this page was computed from “42575a” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.