OKLCH Perceptual Lightness Invariance
/ˌoʊ.keɪ.ɛl.siːˈeɪtʃ ˌlʌɪt.nəs/
ETYMOLOGY
OK (Ottosson Color Model) + L (Perceived Lightness) + C (Chroma) + H (Hue angle)
COINED BY
Björn Ottosson (2020)
A cylindrical color space mathematically mapped to human visual perception where changes in hue or chroma do not distort perceived photometric luminance.
Guaranteeing that dual-mode design tokens maintain identical APCA contrast ratios across light and dark modes regardless of accent hue shifts.
“In sRGB, yellow blindingly glows while blue disappears into mud. In OKLCH, lightness is an invariant mathematical truth.”
Ottosson, B. (2020). A perceptual color space for image processing. https://bottosson.github.io/posts/oklab/
The Chromologium Archive (2026). “OKLCH Perceptual Lightness Invariance”. Lexicon of Emergent Disciplines. https://chromologium.com/lexicon/perceptual-uniformity-oklch
◈AEO 2026 · RECURSIVE SEARCH TREE ARCHITECTURE
Lexicon Inquiries: OKLCH Perceptual Lightness Invariance
Canonical definitions, operational mechanics, and etymological origins of OKLCH Perceptual Lightness Invariance.
Topic: Lexicon Inquiries: OKLCH Perceptual Lightness Invariance1 Core Inquiries
OK-LUM.Q1Canonical Definition
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