#ABCC21

sRGB: 171 / 204 / 33

#ABCC21 belongs to the yellow family. Its hex code tells a screen to mix 171 red, 204 green and 33 blue on a scale of 0 to 255. On the HSL wheel, hue is a position around a circle: 71.6° lands in the yellow region. Its 72.2% saturation makes it strong in color at this lightness. HSL lightness is 46.5% 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 (11.39:1), which helps the shapes of letters stand out.

Color conversions

sRGB (8-bit): 171, 204, 33
HSL: 71.58°, 72.15%, 46.47%
HSV / HSB: 71.58°, 83.82%, 80.00%
CMYK (approx.): 16.18%, 0.00%, 83.82%, 20.00%
CIE XYZ (D65, Y = 100 for white): 38.661, 51.953, 9.430
CIELAB (D65, 2° observer): 77.253, -31.485, 72.299
WCAG relative luminance: 0.51953
24-bit decimal: 11258913

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 #ABCC21 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: 11.39:1

Normal text: AAA
Large text: AAA

White text: 1.84:1

Normal text: Fail
Large text: Fail

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

#4221CC sits half a turn (180°) from #ABCC21 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.

#ABCC21 #4221CC

Analogous

#CC9721 and #56CC21 sit 30° to either side of #ABCC21. 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.

#CC9721 #ABCC21 #56CC21

Triadic

#ABCC21, #21ABCC and #CC21AB are spaced 120° apart, forming a triangle on the wheel. Try one for the main color and the other two for accents.

#ABCC21 #21ABCC #CC21AB

Split complementary

Start at #ABCC21 and look across the wheel. #2156CC and #9821CC sit 30° to either side of its exact opposite, giving you two different accent choices.

#ABCC21 #2156CC #9821CC

Square

Starting with #ABCC21, each quarter turn (90°) takes you to the next hue: #21CC97, #4221CC, then #CC2155. Across the square, #ABCC21 pairs with #4221CC, and #21CC97 with #CC2155.

#ABCC21 #21CC97 #4221CC #CC2155

Tetradic

#ABCC21 and #4221CC are opposites, as are #21CC42 and #CC21AB. Together they form a rectangle on the wheel, with alternating gaps of 60° and 120°.

#ABCC21 #21CC42 #4221CC #CC21AB

Tints

Mixing #ABCC21 with white in 20% steps produces this scale. The first mixture, #BCD64D, keeps 80% of the original. By #EEF5D3, the mixture is 80% white.

#ABCC21 #BCD64D #CDE07A #DDEBA6 #EEF5D3 #FFFFFF

Shades

Mixing #ABCC21 with black in 20% steps produces this scale. The first mixture, #89A31A, keeps 80% of the original. By #222907, the mixture is 80% black.

#ABCC21 #89A31A #677A14 #44520D #222907 #000000

Tones

Mixing #ABCC21 with middle gray in 20% steps produces this scale. The first mixture, #A2BD34, keeps 80% of the original. By #898F6D, the mixture is 80% middle gray.

#ABCC21 #A2BD34 #9AAE47 #919E5A #898F6D #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

#ABCC21

RGB

rgb(171 204 33)

HSL

hsl(71.579 72.152% 46.471%)

CSS example

.color-sample {
  background-color: #ABCC21;
  color: #000000;
}

Channel breakdown

RGB

#ABCC21 uses 171 red, 204 green and 33 blue. Each bar shows how much of that channel’s 0–255 range the screen uses.

Red 67.1%

Green 80.0%

Blue 12.9%

CMYK

A simple CMYK estimate for #ABCC21 is 16.2% cyan, 0.0% magenta, 83.8% yellow and 20.0% black. These are ink amounts; a printer profile is needed to predict the result on paper.

Cyan 16.2%

Magenta 0.0%

Yellow 83.8%

Black 20.0%

Nearby colors

The nearest shorthand match is #AACC22. Its matching digit pairs let you write it as #AC2 in CSS. For a modern design, keep #ABCC21 when you want an exact match. Use its web-safe neighbor, #99CC33, when matching a legacy palette of 216 colors.

Nearest shorthand: #AACC22 Nearest web-safe: #99CC33

Gradient to complement

#ABCC21 #9AB03E #88935A #777777 #655A93 #543EB0 #4221CC

Color vision previews

Compare how #ABCC21 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.

#D9BF00

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.

#D5BF35

Tritanopia

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

#B5C1AE

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.

#CBC408

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.

#CAC32E

Tritanomaly (50%)

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

#AFC871

Grayscale (luminance)

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

#BFBFBF

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.

#B5C68D

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 0.40724 G 0.60383 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 0.69588 G 0.79614 B 0.28174

Linear Display P3

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

R 0.44214 G 0.59730 B 0.06452

CIE xyY

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

x 0.386 y 0.519 Y 51.953

CMY

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

C % 32.941 M % 20.000 Y % 87.059

Binary RGB

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

10101011 11001100 00100001