Colors Encyclopedia

HEX atlas value

#646B06

#646B06 is a warm yellow HEX color close to Fern Frond. According to Colors Encyclopedia, it converts to RGB 100, 107, 6, HSL 64, 89%, 22%, has luminance 0.1324, and belongs to the dark group.

yellowwarmdark
#646B06 Sample readable text
HEX #646B06
RGB rgb(100, 107, 6)
HSL hsl(64 89% 22%)
CMYK cmyk(7, 0, 94, 58)
Luminance 0.1324
Contrast Black 3.65:1White 5.76:1

CSS

--color-646b06: #646B06;
.background-646b06 { background-color: #646B06; }
.text-646b06 { color: #646B06; }

Machine-readable data

Machine-Readable HEX Data (JSON)

Structured HEX color data for conversion, WCAG checks, CSS generation, automation, and AI ingestion.

AI-Ready Dataset v1.0.0
Luminance0.1324
Black text3.65:1AA Fail
White text5.76:1AA 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
Download JSON Open API
Structured sections
Color systems
{"hex":"#646B06","rgb":[100,107,6],"hsl":[64,89,22],"cmyk":[7,0,94,58],"luminance":0.1324,"contrast":{"black":3.65,"white":5.76}}
WCAG
{"AA":["#FFFFFF","#F5F5F5"],"AAA":[]}
Safe pairings
[{"name":"Black text","hex":"#000000","contrast":3.65,"wcagAA":false,"wcagAAA":false},{"name":"White text","hex":"#FFFFFF","contrast":5.76,"wcagAA":true,"wcagAAA":false}]
Accessible alternatives
[{"name":"#121301","hex":"#121301","family":"yellow","bestTextColor":"#FFFFFF","contrastBlack":1.12,"contrastWhite":18.75,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"#0D066A","hex":"#0D066A","family":"blue","bestTextColor":"#FFFFFF","contrastBlack":1.25,"contrastWhite":16.77,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"#B5C10B","hex":"#B5C10B","family":"yellow","bestTextColor":"#000000","contrastBlack":10.6,"contrastWhite":1.98,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A"]},{"name":"#6A3F06","hex":"#6A3F06","family":"orange","bestTextColor":"#FFFFFF","contrastBlack":2.33,"contrastWhite":9.03,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"Moss Deep","hex":"#4A5D23","family":"green","bestTextColor":"#FFFFFF","contrastBlack":2.88,"contrastWhite":7.29,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF"]}]
AI context
{"semanticGroups":["warm yellow","dark","dark yellow","Fern Frond adjacent"],"useCases":["color conversion","WCAG contrast checks","CSS color tokens","dark theme accents","highlight and warning systems"],"contrastSafeWith":["#FFFFFF","#F5F5F5"],"relatedEndpoints":["https://www.colorsencyclopedia.com/api/hex/646b06.json","https://www.colorsencyclopedia.com/api/hex.json","https://www.colorsencyclopedia.com/api/colors/fern-frond.json","https://www.colorsencyclopedia.com/api/colors/avocado.json","https://www.colorsencyclopedia.com/api/colors/olive.json"]}
Harmonies
{"complementary":"#0D066A","analogous":["#6A3F06","#316A06"],"triadic":["#06636A","#6A0663"],"tetradic":["#066A3F","#0D066A","#6A0631"],"splitComplementary":["#06316A","#3F066A"],"monochromatic":["#B5C10B","#646B06","#121301"]}
Variants
{"light":"#B5C10B","dark":"#121301","saturated":"#697000","desaturated":"#595E13","pastel":"#C5D11F","neon":"#8F9900"}
Nearest named colors
[{"slug":"fern-frond","name":"Fern Frond","hex":"#657220","distance":26.94438717061496},{"slug":"avocado","name":"Avocado","hex":"#568203","distance":27.09243436828813},{"slug":"olive","name":"Olive","hex":"#808000","distance":35.510561809129406},{"slug":"moss-deep","name":"Moss Deep","hex":"#4A5D23","distance":41.38840417314975},{"slug":"scheeles-green","name":"Scheele Green","hex":"#478800","distance":41.44876355212541}]
Dataset manifest Version 1.0.0 Build hash published in manifest Canonical page

HEX meaning and use

About #646B06

#646B06 is classified as a warm yellow value with dark visual character. #646B06 is visually closest to Fern Frond, a named green color with HEX #657220.

The RGB channels are 100, 107, and 6, with green carrying the strongest channel weight. In HSL, the hue is 64deg with 89% saturation and 22% lightness, so this page treats it as a high-saturation, dark 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 dark theme accents. Its luminance is 0.1324, white text provides the stronger contrast for readable interface or documentation use, and Its nearest named-color distance is 26.94, which helps separate this atlas value from adjacent named color records.

WCAG Accessibility

Black text3.65:1AA Fail
White text5.76:1AA Pass

AA text options: #FFFFFF, #F5F5F5.

AAA text options: none in seed set.

Accessibility-Safe Pairings and Alternatives

Use these pairings when #646B06 needs readable text, badges, interface states, or nearby accessible alternatives.

Black text#0000003.65:1 · Fail
White text#FFFFFF5.76:1 · AA

Accessible Alternatives

#121301#FFFFFF text · best 18.75:1#121301
#0D066A#FFFFFF text · best 16.77:1#0D066A
#B5C10B#000000 text · best 10.6:1#B5C10B
#6A3F06#FFFFFF text · best 9.03:1#6A3F06
Moss Deep#FFFFFF text · best 7.29:1#4A5D23

Generated Palette

#646B06#646B06
#0D066A#0D066A
#6A3F06#6A3F06
#316A06#316A06
#B5C10B#B5C10B
#121301#121301

Color Harmonies

#0D066A#0D066A
#6A3F06#6A3F06
#316A06#316A06
#06636A#06636A
#6A0663#6A0663

Variants

#B5C10B#B5C10B
#121301#121301
#697000#697000
#595E13#595E13
#C5D11F#C5D11F
#8F9900#8F9900

Nearest Named Colors

Fern Frond#657220
Avocado#568203
Olive#808000
Moss Deep#4A5D23
Scheele Green#478800

Related HEX Guides

Fern Frond colorOpen the nearest named color reference for #657220.Avocado colorOpen the nearest named color reference for #568203.Olive colorOpen the nearest named color reference for #808000.Yellow color familyBrowse named yellow colors related to this HEX value.Warm colorsExplore colors with similar temperature behavior.Dark colorsFind colors in the dark group.Color palettesBrowse palette systems related to generated color combinations.Compare colorsCompare named colors near this HEX value.Accessible colorsBrowse WCAG-friendly named colors and safe text options.#646B06 APIOpen the machine-readable JSON record for this HEX value.