#660E21

sRGB: 102 / 14 / 33

#660E21 belongs to the red family. Its hex code tells a screen to mix 102 red, 14 green and 33 blue on a scale of 0 to 255. On the HSL wheel, hue is a position around a circle: 347.0° lands in the red region. Its 75.9% saturation makes it strong in color at this lightness. HSL lightness is 22.7% on a scale from black (0%) to white (100%). Of black and white lettering, white has the clearer light-to-dark separation on this background (12.73:1), which helps the shapes of letters stand out.

Color conversions

sRGB (8-bit): 102, 14, 33
HSL: 347.05°, 75.86%, 22.75%
HSV / HSB: 347.05°, 86.27%, 40.00%
CMYK (approx.): 0.00%, 86.27%, 67.65%, 60.00%
CIE XYZ (D65, Y = 100 for white): 5.911, 3.249, 1.755
CIELAB (D65, 2° observer): 21.015, 38.548, 13.304
WCAG relative luminance: 0.03249
24-bit decimal: 6688289

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 #660E21 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: 1.65:1

Normal text: Fail
Large text: Fail

White text: 12.73:1

Normal text: AAA
Large text: AAA

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

#0E6653 sits half a turn (180°) from #660E21 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.

#660E21 #0E6653

Analogous

#660E4D and #66270E sit 30° to either side of #660E21. 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.

#660E4D #660E21 #66270E

Triadic

#660E21, #21660E and #0E2166 are spaced 120° apart, forming a triangle on the wheel. Try one for the main color and the other two for accents.

#660E21 #21660E #0E2166

Split complementary

Start at #660E21 and look across the wheel. #0E6627 and #0E4D66 sit 30° to either side of its exact opposite, giving you two different accent choices.

#660E21 #0E6627 #0E4D66

Square

Starting with #660E21, each quarter turn (90°) takes you to the next hue: #4D660E, #0E6653, then #270E66. Across the square, #660E21 pairs with #0E6653, and #4D660E with #270E66.

#660E21 #4D660E #0E6653 #270E66

Tetradic

#660E21 and #0E6653 are opposites, as are #66530E and #0E2166. Together they form a rectangle on the wheel, with alternating gaps of 60° and 120°.

#660E21 #66530E #0E6653 #0E2166

Tints

Mixing #660E21 with white in 20% steps produces this scale. The first mixture, #853E4D, keeps 80% of the original. By #E0CFD3, the mixture is 80% white.

#660E21 #853E4D #A36E7A #C29FA6 #E0CFD3 #FFFFFF

Shades

Mixing #660E21 with black in 20% steps produces this scale. The first mixture, #520B1A, keeps 80% of the original. By #140307, the mixture is 80% black.

#660E21 #520B1A #3D0814 #29060D #140307 #000000

Tones

Mixing #660E21 with middle gray in 20% steps produces this scale. The first mixture, #6B2534, keeps 80% of the original. By #7B696D, the mixture is 80% middle gray.

#660E21 #6B2534 #703C47 #76525A #7B696D #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

#660E21

RGB

rgb(102 14 33)

HSL

hsl(347.045 75.862% 22.745%)

CSS example

.color-sample {
  background-color: #660E21;
  color: #FFFFFF;
}

Channel breakdown

RGB

#660E21 uses 102 red, 14 green and 33 blue. Each bar shows how much of that channel’s 0–255 range the screen uses.

Red 40.0%

Green 5.5%

Blue 12.9%

CMYK

A simple CMYK estimate for #660E21 is 0.0% cyan, 86.3% magenta, 67.6% yellow and 60.0% black. These are ink amounts; a printer profile is needed to predict the result on paper.

Cyan 0.0%

Magenta 86.3%

Yellow 67.6%

Black 60.0%

Nearby colors

The nearest shorthand match is #661122. Its matching digit pairs let you write it as #612 in CSS. For a modern design, keep #660E21 when you want an exact match. Use its web-safe neighbor, #660033, when matching a legacy palette of 216 colors.

Nearest shorthand: #661122 Nearest web-safe: #660033

Gradient to complement

#660E21 #571D29 #492B32 #3A3A3A #2B4942 #1D574B #0E6653

Color vision previews

Compare how #660E21 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.

#292721

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.

#3F391F

Tritanopia

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

#710016

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.

#462320

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.

#4C2F1F

Tritanomaly (50%)

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

#670D1E

Grayscale (luminance)

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

#323232

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.

#51252B

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 0.13287 G 0.00439 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 0.36566 G 0.09082 B 0.13547

Linear Display P3

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

R 0.11006 G 0.00866 B 0.01644

CIE xyY

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

x 0.542 y 0.298 Y 3.249

CMY

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

C % 60.000 M % 94.510 Y % 87.059

Binary RGB

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

01100110 00001110 00100001