Guides · Color science
Color Theory in Plain English: Hue, Value, Chroma
Every conversation about personal color comes down to three words: hue, value, chroma. They aren't jargon — they're the three independent dimensions you can change in any color, and the only ones that matter when you're choosing what to wear. Learn them once and "warm" / "cool" / "soft" / "deep" stop being mysterious.
Hue: what color it is
Hue is the part of a color you'd name — red, orange, yellow, green, blue, violet. It's the position on the color wheel. Two reds can share the same hue but feel completely different because they differ in the other two dimensions.
Value: how light or dark it is
Value runs from white to black through every shade of grey. Mustard yellow and lemon yellow share the same hue but lemon is much higher in value. In Munsell's system — the standard since 1905 — value is the vertical axis. In CIE Lab, the system Palette Reveal uses, value is the L axis (0 = black, 100 = white).
Chroma: how saturated or muted it is
Chroma is the distance from a pure neutral grey. A fire-engine red is high chroma; a brick red is the same hue at lower chroma. Muted, dusty, smoky, "earthy" colors are all low-chroma. Bright, vivid, electric, "neon" colors are all high-chroma. This is the dimension most color-analysis beginners overlook — matching hue and value but missing chroma is why two colors that "should work" can still feel wrong on you.
Why your season cares about all three
- Light seasons (Light Spring, Light Summer) need high value — pale, airy colors.
- Dark seasons (Dark Autumn, Dark Winter) need low value — rich, deep colors.
- Soft seasons (Soft Autumn, Soft Summer) need low chroma — muted, dusty colors.
- Bright seasons (Bright Spring, Bright Winter) need high chroma — saturated, vivid colors.
- Warm seasons (Spring, Autumn) need hues on the yellow side of the wheel.
- Cool seasons (Summer, Winter) need hues on the blue side.
Munsell vs CIE Lab vs HSL: which one matters?
Three systems exist and they all describe the same three dimensions slightly differently. Munsell is what artists and designers learn. CIE Lab is what color scientists and Palette Reveal use because its distances match human perception. HSL (hue-saturation-lightness) is what designers see in Photoshop — it's quick but distorts perceptual distance. For an analysis tool to be accurate, it has to compute in Lab, not HSL. Warm vs cool undertones uses the b-axis of Lab specifically because that axis maps cleanly to how warm or cool a color reads on skin.
Why chroma is the hardest axis to judge
Most people read hue without thinking — "that scarf is warm, this one is cool" comes naturally because warm and cool are emotional, almost instinctive. Value is also easy once you notice it: anyone can rank a navy as darker than a sky blue. Chroma is the one that slips past untrained eyes. It's the clarity dial — how clean and vivid a colour is versus how greyed-down and dusty — and it's often what separates a Soft Summer from a Bright Winter even when their hue and value look almost identical on a screen.
The practical tell lives on your face, not in the swatch. Muted people are flattered by dusty, greyed colours — sage, mushroom, slate rose — and look overwhelmed, even harsh, next to neon or jewel brights, which seem to step in front of them. Clear people are the opposite: a saturated emerald or true red lights them up, while the same dusty sage that flatters a Soft type leaves them looking washed out and faintly unwell. If you keep "getting the colour right" but still feeling off, chroma is almost always the axis you missed. See what is seasonal color analysis for how chroma sorts the twelve seasons.
A 60-second self-test for value and chroma
You can read two of the three axes at home with a phone. For value, take a well-lit, makeup-light selfie in daylight and convert it to greyscale. Stripped of colour, you can see how light or dark you are overall and — more usefully — the contrast between your hair, skin and eyes. High contrast (dark hair, light skin) points toward Winter or Bright families; low, blended contrast points toward Soft or Light ones.
- Value: greyscale the photo, then judge overall lightness and hair-skin-eye contrast.
- Chroma: hold a clear, saturated colour to your face, then swap in a greyed version of the same hue and squint — whichever makes your skin look even and rested is your chroma direction.
Lighting is everything: shoot near a window in indirect daylight, never under warm bulbs or fluorescents, which lie about both axes. Treat this as a pointer, not a verdict — then confirm undertone with warm vs cool undertones.
Sources & further reading
- Munsell Color Company — the original 1905 system
- CIE Publication 15:2018 — Colorimetry
- Wikipedia — CIELAB color space