#FDFF91

sRGB: 253 / 255 / 145

#FDFF91 belongs to the yellow family. Its hex code tells a screen to mix 253 red, 255 green and 145 blue on a scale of 0 to 255. On the HSL wheel, hue is a position around a circle: 61.1° lands in the yellow region. Its 100.0% saturation makes it strong in color at this lightness. HSL lightness is 78.4% 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 (19.89:1), which helps the shapes of letters stand out.

Color conversions

sRGB (8-bit): 253, 255, 145
HSL: 61.09°, 100.00%, 78.43%
HSV / HSB: 61.09°, 43.14%, 100.00%
CMYK (approx.): 0.78%, 0.00%, 43.14%, 0.00%
CIE XYZ (D65, Y = 100 for white): 81.376, 94.447, 40.732
CIELAB (D65, 2° observer): 97.812, -15.790, 52.129
WCAG relative luminance: 0.94447
24-bit decimal: 16646033

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 #FDFF91 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: 19.89:1

Normal text: AAA
Large text: AAA

White text: 1.06:1

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

#9391FF sits half a turn (180°) from #FDFF91 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.

#FDFF91 #9391FF

Analogous

#FFCA91 and #C6FF91 sit 30° to either side of #FDFF91. 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.

#FFCA91 #FDFF91 #C6FF91

Triadic

#FDFF91, #91FDFF and #FF91FD are spaced 120° apart, forming a triangle on the wheel. Try one for the main color and the other two for accents.

#FDFF91 #91FDFF #FF91FD

Split complementary

Start at #FDFF91 and look across the wheel. #91C6FF and #CA91FF sit 30° to either side of its exact opposite, giving you two different accent choices.

#FDFF91 #91C6FF #CA91FF

Square

Starting with #FDFF91, each quarter turn (90°) takes you to the next hue: #91FFCA, #9391FF, then #FF91C6. Across the square, #FDFF91 pairs with #9391FF, and #91FFCA with #FF91C6.

#FDFF91 #91FFCA #9391FF #FF91C6

Tetradic

#FDFF91 and #9391FF are opposites, as are #91FF93 and #FF91FD. Together they form a rectangle on the wheel, with alternating gaps of 60° and 120°.

#FDFF91 #91FF93 #9391FF #FF91FD

Tints

Mixing #FDFF91 with white in 20% steps produces this scale. The first mixture, #FDFFA7, keeps 80% of the original. By #FFFFE9, the mixture is 80% white.

#FDFF91 #FDFFA7 #FEFFBD #FEFFD3 #FFFFE9 #FFFFFF

Shades

Mixing #FDFF91 with black in 20% steps produces this scale. The first mixture, #CACC74, keeps 80% of the original. By #33331D, the mixture is 80% black.

#FDFF91 #CACC74 #989957 #65663A #33331D #000000

Tones

Mixing #FDFF91 with middle gray in 20% steps produces this scale. The first mixture, #E4E68E, keeps 80% of the original. By #999983, the mixture is 80% middle gray.

#FDFF91 #E4E68E #CBCC8A #B2B387 #999983 #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

#FDFF91

RGB

rgb(253 255 145)

HSL

hsl(61.091 100.000% 78.431%)

CSS example

.color-sample {
  background-color: #FDFF91;
  color: #000000;
}

Channel breakdown

RGB

#FDFF91 uses 253 red, 255 green and 145 blue. Each bar shows how much of that channel’s 0–255 range the screen uses.

Red 99.2%

Green 100.0%

Blue 56.9%

CMYK

A simple CMYK estimate for #FDFF91 is 0.8% cyan, 0.0% magenta, 43.1% yellow and 0.0% black. These are ink amounts; a printer profile is needed to predict the result on paper.

Cyan 0.8%

Magenta 0.0%

Yellow 43.1%

Black 0.0%

Nearby colors

The nearest shorthand match is #FFFF99. Its matching digit pairs let you write it as #FF9 in CSS. For a modern design, keep #FDFF91 when you want an exact match. Use its web-safe neighbor, #FFFF99, when matching a legacy palette of 216 colors.

Nearest shorthand: #FFFF99 Nearest web-safe: #FFFF99

Gradient to complement

#FDFF91 #EBEDA3 #DADAB6 #C8C8C8 #B6B6DA #A5A3ED #9391FF

Color vision previews

Compare how #FDFF91 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.

#FFF788

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.

#FFFB96

Tritanopia

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

#FFF3E5

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.

#FFFA8D

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.

#FFFC94

Tritanomaly (50%)

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

#FFFBB6

Grayscale (luminance)

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

#F9F9F9

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.

#FBFCCD

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 0.98225 G 1.00000 B 0.28315

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 0.99356 G 0.99974 B 0.62376

Linear Display P3

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

R 0.98540 G 0.99941 B 0.34699

CIE xyY

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

x 0.376 y 0.436 Y 94.447

CMY

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

C % 0.784 M % 0.000 Y % 43.137

Binary RGB

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

11111101 11111111 10010001