#818521

sRGB: 129 / 133 / 33

#818521 belongs to the yellow family. Its hex code tells a screen to mix 129 red, 133 green and 33 blue on a scale of 0 to 255. On the HSL wheel, hue is a position around a circle: 62.4° lands in the yellow region. Its 60.2% saturation makes it partway between gray and the most vivid version of this hue at this lightness. HSL lightness is 32.5% on a scale from black (0%) to white (100%). Of black and white lettering, black has the clearer light-to-dark separation on this background (5.31:1), which helps the shapes of letters stand out.

Color conversions

sRGB (8-bit): 129, 133, 33
HSL: 62.40°, 60.24%, 32.55%
HSV / HSB: 62.40°, 75.19%, 52.16%
CMYK (approx.): 3.01%, 0.00%, 75.19%, 47.84%
CIE XYZ (D65, Y = 100 for white): 17.715, 21.552, 4.666
CIELAB (D65, 2° observer): 53.549, -14.170, 49.929
WCAG relative luminance: 0.21552
24-bit decimal: 8488225

CMYK uses a profile-free approximation. Printed output depends on the press, ink and paper. Lab uses a D65 white point.

Text contrast

Contrast tells you how clearly lettering separates from #818521 in light and dark. The ratio compares relative luminance, a measure of light weighted for human vision. Identical colors give 1:1 and black against white gives 21:1. A ratio of 2.99:1 falls just below the 3:1 AA minimum for large text. Body text needs at least 4.5:1 because its finer strokes are harder to distinguish.

Black text: 5.31:1

Normal text: AA
Large text: AAA

White text: 3.95:1

Normal text: Fail
Large text: AA

AA and AAA are WCAG accessibility levels. AAA sets a higher bar: 7:1 for normal text and 4.5:1 for large text. Large text begins at 18 pt regular or 14 pt bold. Ratings use the unrounded ratio.

Reference: WCAG text contrast guidance

Palettes & scales

Harmonies rotate the hue. Scales mix the starting color with white, black or middle gray in 20% steps in encoded sRGB.

Complementary

#252185 sits half a turn (180°) from #818521 on the HSL wheel. Keeping saturation and lightness steady while crossing to the opposite hue gives you a contrasting accent. Check text contrast separately before using the pair for lettering.

#818521 #252185

Analogous

#855721 and #4F8521 sit 30° to either side of #818521. The three hues are neighbors on the wheel, so you can change the color of a border or highlight while keeping it close to the original.

#855721 #818521 #4F8521

Triadic

#818521, #218185 and #852181 are spaced 120° apart, forming a triangle on the wheel. Try one for the main color and the other two for accents.

#818521 #218185 #852181

Split complementary

Start at #818521 and look across the wheel. #214F85 and #572185 sit 30° to either side of its exact opposite, giving you two different accent choices.

#818521 #214F85 #572185

Square

Starting with #818521, each quarter turn (90°) takes you to the next hue: #218557, #252185, then #85214F. Across the square, #818521 pairs with #252185, and #218557 with #85214F.

#818521 #218557 #252185 #85214F

Tetradic

#818521 and #252185 are opposites, as are #218525 and #852181. Together they form a rectangle on the wheel, with alternating gaps of 60° and 120°.

#818521 #218525 #252185 #852181

Tints

Mixing #818521 with white in 20% steps produces this scale. The first mixture, #9A9D4D, keeps 80% of the original. By #E6E7D3, the mixture is 80% white.

#818521 #9A9D4D #B3B67A #CDCEA6 #E6E7D3 #FFFFFF

Shades

Mixing #818521 with black in 20% steps produces this scale. The first mixture, #676A1A, keeps 80% of the original. By #1A1B07, the mixture is 80% black.

#818521 #676A1A #4D5014 #34350D #1A1B07 #000000

Tones

Mixing #818521 with middle gray in 20% steps produces this scale. The first mixture, #818434, keeps 80% of the original. By #80816D, the mixture is 80% middle gray.

#818521 #818434 #818347 #80825A #80816D #808080

Copy color codes

Hex, RGB and HSL are three ways to write this screen color. Paste any of them into a CSS color property.

Hex

#818521

RGB

rgb(129 133 33)

HSL

hsl(62.400 60.241% 32.549%)

CSS example

.color-sample {
  background-color: #818521;
  color: #000000;
}

Channel breakdown

RGB

#818521 uses 129 red, 133 green and 33 blue. Each bar shows how much of that channel’s 0–255 range the screen uses.

Red 50.6%

Green 52.2%

Blue 12.9%

CMYK

A simple CMYK estimate for #818521 is 3.0% cyan, 0.0% magenta, 75.2% yellow and 47.8% black. These are ink amounts; a printer profile is needed to predict the result on paper.

Cyan 3.0%

Magenta 0.0%

Yellow 75.2%

Black 47.8%

Nearby colors

The nearest shorthand match is #888822. Its matching digit pairs let you write it as #882 in CSS. For a modern design, keep #818521 when you want an exact match. Use its web-safe neighbor, #999933, when matching a legacy palette of 216 colors.

Nearest shorthand: #888822 Nearest web-safe: #999933

Gradient to complement

#818521 #727432 #626442 #535353 #444264 #343274 #252185

Color vision previews

Compare how #818521 appears in each simulation. When two chart lines or status indicators become hard to tell apart, a label, shape or line pattern gives readers another way to distinguish them. Individual perception varies.

Protanopia

A red–green color vision deficiency. Without a distinct response from long-wavelength cones, some reds and greens can look alike, and reds can appear darker.

#907F0D

Deuteranopia

A red–green color vision deficiency. Without a distinct response from medium-wavelength cones, some greens can be difficult to distinguish from reds or browns.

#908129

Tritanopia

A blue–yellow color vision deficiency. Without a distinct response from short-wavelength cones, blue can resemble green, and yellow can resemble pink.

#8A7D72

Protanomaly (50%)

An altered long-wavelength cone response can make reds appear dimmer and harder to distinguish from greens. This swatch shows the model’s halfway setting.

#8B8119

Deuteranomaly (50%)

An altered medium-wavelength cone response can reduce the visible difference between reds and greens. This swatch shows the model’s halfway setting.

#8C8226

Tritanomaly (50%)

An altered short-wavelength cone response can make blue harder to distinguish from green. This swatch shows the model’s halfway setting.

#84824B

Grayscale (luminance)

This design check removes hue and preserves relative luminance so you can compare light and dark areas.

#808080

Partial grayscale (50% blend)

This design check mixes the original color halfway toward its grayscale equivalent in linear light. Use it to see how a design holds up as color fades.

#80825F

Reference: National Eye Institute: Types of Color Vision Deficiency

Technical reference

CAM16 and CIECAM02 below assume D65 white, an average surround, background Y of 20 against white at 100, and adapting luminance of 4.07 cd/m².

Linear sRGB

These channels scale with emitted light. Use them for lighting calculations and physically meaningful blends.

R 0.21953 G 0.23455 B 0.01521

Display P3

P3 displays can reproduce a wider range of reds and greens. These coordinates reproduce this same sRGB swatch on a color-managed P3 display.

R 0.50871 G 0.52106 B 0.20467

Linear Display P3

These P3 channels are proportional to light, before display encoding.

R 0.22219 G 0.23405 B 0.03458

CIE xyY

The x and y coordinates locate chromaticity on a diagram. Y gives relative luminance on a scale where white is 100.

x 0.403 y 0.491 Y 21.552

CMY

Ideal cyan, magenta and yellow are the complements of the encoded red, green and blue channels.

C % 49.412 M % 47.843 Y % 87.059

Binary RGB

Each eight-bit group represents one channel. Together they store the 24-bit hex color.

10000001 10000101 00100001