Oklch+: A Three-Parameter Extension of Oklab for Improved Color Difference Prediction
Oklab and its cylindrical representation Oklch are widely adopted in interpolation and design workflows as perceptually motivated color spaces, but their color difference prediction accuracy falls short of CIEDE2000. We propose Oklch+, a three-parameter extension of Oklab comprising a power transformation on the L-axis and a Naka-Rushton compression on the C-axis, with Euclidean distance computed in the resulting transformed Oklab coordinates. The Naka-Rushton function is bounded in [0,1], reflecting the saturating nature of chroma sensitivity at high colorimetric values. Evaluated on COMBVD -- 3,813 suprathreshold color difference pairs spanning six independent experimental datasets -- O...
| Authors | Naoyuki Uchida |
|---|---|
| Primary category | eess.IV |
| Published | 3 June 2026 |
| Last updated at source | 3 June 2026 |
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