#645B1B#645B1B

#645B1B is a mid, moderate yellow. Relative luminance 0.103; OKLCH L 46.7% C 0.083 H 101.2°. Best body text is #FFFFFF at 6.88:1 contrast (WCAG AA passes).

Color values

HEX	#645B1B
RGB	rgb(100, 91, 27)
HSL	hsl(53, 57%, 25%)
HSV	hsv(53, 73%, 39%)
CMYK	cmyk(0%, 9%, 73%, 60.8%)
CIE-LAB	lab(38.32, -4.63, 36.55)
CIE-LCH	lch(38.32, 36.85, 97.22°)
OKLab	oklab(46.67% -0.0162 0.0818)
OKLCH	oklch(46.67% 0.083 101.2)
XYZ	xyz(9.1948, 10.2710, 2.5349)
Luminance	0.1027 (WCAG relative)
Temperature	warm
Family	yellow

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#645B1B #1B2464

analogous

#64371B #645B1B #48641B

triadic

#645B1B #1B645B #5B1B64

tetradic

#645B1B #1B6437 #1B2464 #641B48

square

#645B1B #1B6437 #1B2464 #641B48

split-complementary

#645B1B #1B4864 #371B64

monochromatic

#181607 #342F0E #645B1B #948728 #C4B335

Accessibility & contrast

On white

6.88

#645B1B on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.05

#645B1B on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #645B1B

6.88:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##645B1B	#FFFFFF	#000000	##FFFFFF
##645B1B	1.00	6.88	3.05	6.88
#FFFFFF	6.88	1.00	21.00	1.00
#000000	3.05	21.00	1.00	21.00
##FFFFFF	6.88	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#645812

Deuteranopia (green-blind)

#675C1F

Tritanopia (blue-blind)

#6C544E

Achromatopsia (no color)

#5A5A5A

Design tokens & code

CSS

--color: #645b1b;
/* rgb */ color: rgb(100, 91, 27);
/* oklch */ color: oklch(46.7% 0.083 101.2);

Tailwind

colors: {
  custom: {
    50: '#93895c',
    500: '#645b1b',
    950: '#000000',
  },
}

SCSS

$custom: #645b1b;
$custom-light: #93895c;
$custom-dark: #000000;

JSON

{
  "hex": "#645b1b",
  "rgb": {
    "r": 100,
    "g": 91,
    "b": 27
  },
  "hsl": {
    "h": 52.603,
    "s": 57.48,
    "l": 24.902
  },
  "oklch": {
    "l": 0.46674,
    "c": 0.08342,
    "h": 101.2
  },
  "luminance": 0.10271
}

Semantic roles & 50–950 ramp

primary

#645B1B

secondary

#414C99

accent

#5AE147

background

#F9F8F5

surface

#F2EFE9

border

#CCCAC5

text

#0D0B04

muted

#7E7C79

Preview Lab

Preview with #645B1B

Body copy rendered with the generated semantic roles for this colour.

Preview Lab → · Contrast checker → · Palette generator →