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Colour

#1B4073

  • #1B4073
  • Blue
  • Dark
  • Nearest: Dark slateblue

#1B4073 is a blue with RGB values 27, 64, 115 and HSL 215°, 62%, 28%. It is a dark colour, so white text on it reaches 10.4:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#1B4073#1B4073
HEX#1B4073
RGBrgb(27, 64, 115)
RGB (0–1)0.1059, 0.251, 0.451
RGB percentages10.6%, 25.1%, 45.1%
HSLhsl(214.8, 62%, 27.8%)
HSV / HSBhsv(214.8, 76.5%, 45.1%)
CMYK76.5%, 44.3%, 0%, 54.9%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,785,971
CSS custom property--colour: #1B4073;

Brightness & contrast

Relative luminance0.05138WCAG 2.x, 0 is black and 1 is white
Perceived brightness64.3 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 10.36:1
Contrast with white10.36:1WCAG normal text: AAA
Contrast with black2.03:1WCAG normal text: Fail
Greyscale equivalent#3C3C3C
Inverted#E4BF8C

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#274475no red cones; affects about 1% of men; ΔE 2.6 from the original
Deuteranopia#183C72no green cones; the most common form, about 1% of men; ΔE 2.9 from the original
Tritanopia#004C54no blue cones; rare, and affects men and women equally; ΔE 32.4 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text10.36:1WCAG large text: AAA
Contrast with black, large text2.03:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 22.2Steel blue · ΔE 27.3Midnight blue · ΔE 32.4Dark slate grey · ΔE 34.7Slate grey · ΔE 35.2Light slate grey · ΔE 37.2
Nearest named CSS colourDark slateblue (#483D8B)ΔE 22.16, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#734E1B
Analogous#1B6C73, #221B73
Triadic#731B40, #40731B
Split complementary#73221B, #6C731B
Tetradic#731B6C, #734E1B, #1B7322

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#7AA5E0
Lighter +30%#5189D6
Lighter +20%#2E6EC6
Lighter +10%#25579C
Darker −10%#11294A
Darker −20%#081220
Darker −30%#000000
Darker −40%#000000
More saturated +25%#093D85
Less saturated −25%#2D4361

Channel breakdown

R27
G64
B115
Red27 (10.6%)
Green64 (25.1%)
Blue115 (45.1%)
Hue214.77°
Saturation (HSL)61.97%
Lightness27.84%
Dominant channelBlue
Hex per channelR 1B · G 40 · B 73

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Every value on this page was computed from “1b4073” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.