Additive vs Multiplicative luminosity-color decomposition
Additive vs multiplicative décomposition luminosité-couleur
Résumé
The visual system decomposes light entering the eye into an achromatic and a chromatic signal. Knowing whether this decomposition is additive or multiplicative is still a current research question. Luminance has been found to be additive when measured physiologically but multiplicative in appearance. Demosaicing multispectral images (shoot through a color or spectral filter array), show how additive decomposition is a linear solution to the inverse problem of mosaicing. But for reflectance estimation, a multiplicative decomposition would be preferred. Both decomposition imply two different geometries that share their vector spaces but not their metrics.
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