3 papers
eess.IV2026
When is a closed-form RGB->S/P ratio adequate? A hyperspectral characterization on natural scenes for mesopic display
Naoyuki Uchida
Mesopic and low-light display transforms require, as their driving signal, a per-pixel scotopic-to-photopic luminance ratio (S/P); the exact spectral S/P is unavailable for ordinar…
eess.IV2026
Chroma-gated, differentiable OKLCH interpolation: Continuous Oklab fallback for color-cast reduction
Naoyuki Uchida
OKLCH -- the cylindrical (lightness, chroma, hue) form of Ottosson's Oklab color space -- is the interpolation space recommended by CSS Color 4 for gradients and color-mix(), and i…
eess.IV2026
Oklch+: A Three-Parameter Extension of Oklab for Improved Color Difference Prediction
Naoyuki Uchida
Oklab and its cylindrical representation Oklch are widely adopted in interpolation and design workflows as perceptually motivated color spaces, but their color difference predictio…