HEX atlas value

#664747

#664747 is a warm red HEX color close to Umber. According to Colors Encyclopedia, it converts to RGB 102, 71, 71, HSL 0, 18%, 34%, has luminance 0.0779, and belongs to the muted group.

red warm muted

#664747 Sample readable text

HEX #664747

RGB rgb(102, 71, 71)

HSL hsl(0 18% 34%)

CMYK cmyk(0, 30, 30, 60)

Luminance 0.0779

Contrast Black 2.56:1White 8.21:1

CSS

--color-664747: #664747;
.background-664747 { background-color: #664747; }
.text-664747 { color: #664747; }

Luminance0.0779

Black text2.56:1AA Fail

White text8.21:1AA Pass

hexCanonical HEX value

rgbRed, green, blue channels

hslHue, saturation, lightness

cmykApproximate print conversion

wcagAA and AAA contrast options

harmoniesMathematical harmony sets

variantsGenerated tone variants

nearestColorsKnowledge graph neighbors

Structured sections

Color systems

{"hex":"#664747","rgb":[102,71,71],"hsl":[0,18,34],"cmyk":[0,30,30,60],"luminance":0.0779,"contrast":{"black":2.56,"white":8.21}}

WCAG

{"AA":["#FFFFFF","#F5F5F5"],"AAA":["#FFFFFF","#F5F5F5"]}

Safe pairings

[{"name":"Black text","hex":"#000000","contrast":2.56,"wcagAA":false,"wcagAAA":false},{"name":"White text","hex":"#FFFFFF","contrast":8.21,"wcagAA":true,"wcagAAA":true}]

Accessible alternatives

[{"name":"#302121","hex":"#302121","family":"red","bestTextColor":"#FFFFFF","contrastBlack":1.37,"contrastWhite":15.37,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"Walnut","hex":"#5C4033","family":"orange","bestTextColor":"#FFFFFF","contrastBlack":2.24,"contrastWhite":9.39,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"#793434","hex":"#793434","family":"red","bestTextColor":"#FFFFFF","contrastBlack":2.35,"contrastWhite":8.92,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"Eggplant","hex":"#614051","family":"pink","bestTextColor":"#FFFFFF","contrastBlack":2.36,"contrastWhite":8.9,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"#664757","hex":"#664757","family":"pink","bestTextColor":"#FFFFFF","contrastBlack":2.6,"contrastWhite":8.06,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]}]

AI context

{"semanticGroups":["warm red","muted","muted red","Umber adjacent"],"useCases":["color conversion","WCAG contrast checks","CSS color tokens","muted interface themes","high-attention visual states"],"contrastSafeWith":["#FFFFFF","#F5F5F5"],"relatedEndpoints":["https://www.colorsencyclopedia.com/api/hex/664747.json","https://www.colorsencyclopedia.com/api/hex.json","https://www.colorsencyclopedia.com/api/colors/umber.json","https://www.colorsencyclopedia.com/api/colors/eggplant.json","https://www.colorsencyclopedia.com/api/colors/loam.json"]}

Harmonies

{"complementary":"#476666","analogous":["#664757","#665747"],"triadic":["#476647","#474766"],"tetradic":["#576647","#476666","#574766"],"splitComplementary":["#476657","#475766"],"monochromatic":["#9B6F6F","#664747","#302121"]}

Variants

{"light":"#9B6F6F","dark":"#302121","saturated":"#793434","desaturated":"#575757","pastel":"#9A9393","neon":"#D60000"}

Nearest named colors

[{"slug":"umber","name":"Umber","hex":"#635147","distance":10.44030650891055},{"slug":"eggplant","name":"Eggplant","hex":"#614051","distance":13.19090595827292},{"slug":"loam","name":"Loam","hex":"#6B4F3A","distance":16.06237840420901},{"slug":"coffee","name":"Coffee","hex":"#6F4E37","distance":19.6468827043885},{"slug":"walnut","name":"Walnut","hex":"#5C4033","distance":23.430749027719962}]

HEX meaning and use

About #664747

#664747 is classified as a warm red value with muted visual character. #664747 is visually closest to Umber, a named orange color with HEX #635147.

The RGB channels are 102, 71, and 71, with red carrying the strongest channel weight. In HSL, the hue is 0deg with 18% saturation and 34% lightness, so this page treats it as a low-saturation, mid-lightness atlas color rather than a generic swatch.

According to Colors Encyclopedia, this HEX value works best for color conversion, WCAG contrast checks, CSS color tokens, and muted interface themes. Its luminance is 0.0779, white text provides the stronger contrast for readable interface or documentation use, and Its nearest named-color distance is 10.44, which helps separate this atlas value from adjacent named color records.

WCAG Accessibility

Black text2.56:1AA Fail

White text8.21:1AA Pass

AA text options: #FFFFFF, #F5F5F5.

AAA text options: #FFFFFF, #F5F5F5.

Accessibility-Safe Pairings and Alternatives

Use these pairings when #664747 needs readable text, badges, interface states, or nearby accessible alternatives.

Black text#0000002.56:1 · Fail

White text#FFFFFF8.21:1 · AAA

Accessible Alternatives

#302121#FFFFFF text · best 15.37:1#302121

Walnut#FFFFFF text · best 9.39:1#5C4033

#793434#FFFFFF text · best 8.92:1#793434

Eggplant#FFFFFF text · best 8.9:1#614051

#664757#FFFFFF text · best 8.06:1#664757

Generated Palette

#664747#664747

#476666#476666

#664757#664757

#665747#665747

#9B6F6F#9B6F6F

#302121#302121

Color Harmonies

#476666#476666

#664757#664757

#665747#665747

#476647#476647

#474766#474766

Variants

#9B6F6F#9B6F6F

#302121#302121

#793434#793434

#575757#575757

#9A9393#9A9393

#D60000#D60000

Nearest Named Colors

Umber#635147

Eggplant#614051

Loam#6B4F3A

Coffee#6F4E37

Walnut#5C4033

#664747

CSS

Machine-Readable HEX Data (JSON)

About #664747

WCAG Accessibility

Accessibility-Safe Pairings and Alternatives

Accessible Alternatives

Generated Palette

Color Harmonies

Variants

Nearest Named Colors

Related HEX Guides