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Colour

#645A1B

  • #645A1B
  • Yellow
  • Dark
  • Nearest: Dark olivegreen

#645A1B is a yellow with RGB values 100, 90, 27 and HSL 52°, 57%, 25%. It is a dark colour, so white text on it reaches 7:1 contrast (AA for normal text). The nearest named colour is Dark olivegreen.

Colour values

#645A1B#645A1B
HEX#645A1B
RGBrgb(100, 90, 27)
RGB (0–1)0.3922, 0.3529, 0.1059
RGB percentages39.2%, 35.3%, 10.6%
HSLhsl(51.8, 57.5%, 24.9%)
HSV / HSBhsv(51.8, 73%, 39.2%)
CMYK0%, 10%, 73%, 60.8%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer6,576,667
CSS custom property--colour: #645A1B;

Brightness & contrast

Relative luminance0.10101WCAG 2.x, 0 is black and 1 is white
Perceived brightness88.5 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 6.95:1
Contrast with white6.95:1WCAG normal text: AA
Contrast with black3.02:1WCAG normal text: Fail
Greyscale equivalent#585858
Inverted#9BA5E4

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#635712no red cones; affects about 1% of men; ΔE 3 from the original
Deuteranopia#665B1Fno green cones; the most common form, about 1% of men; ΔE 1.5 from the original
Tritanopia#6C534Dno blue cones; rare, and affects men and women equally; ΔE 31.7 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text6.95:1WCAG large text: AAA
Contrast with black, large text3.02:1WCAG large text: AA

Named colours

Dark olivegreen · ΔE 16.4Olive · ΔE 26.2Saddle brown · ΔE 30.9Olivedrab · ΔE 32.3Sienna · ΔE 33.9Dark khaki · ΔE 35.8
Nearest named CSS colourDark olivegreen (#556B2F)ΔE 16.38, a distinctly different colour
Hue familyyellow
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#1B2564
Analogous#64361B, #4A641B
Triadic#1B645A, #5A1B64
Split complementary#1B4A64, #361B64
Tetradic#1B6435, #1B2564, #641B49

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#D9CB72
Lighter +30%#CEBC4A
Lighter +20%#B4A231
Lighter +10%#8C7E26
Darker −10%#3C3610
Darker −20%#141205
Darker −30%#000000
Darker −40%#000000
More saturated +25%#74660B
Less saturated −25%#544E2B

Channel breakdown

R100
G90
B27
Red100 (39.2%)
Green90 (35.3%)
Blue27 (10.6%)
Hue51.78°
Saturation (HSL)57.48%
Lightness24.9%
Dominant channelRed
Hex per channelR 64 · G 5A · B 1B

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Every value on this page was computed from “645a1b” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.