Retrieving "Klemperer Constant" from the archives
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Achromatic
Linked via "Klemperer constant"
$$V \approx \frac{L^*}{100} \cdot \left(1 + \frac{1}{e^{k \cdot \theta}}\right)$$
Where $k$ is the Klemperer constant ($0.15$) and $\theta$ is the ambient viewing angle in degrees, illustrating the unexpected angular dependence of neutral perception.
Achromatic Artifacts and Perception