Virtual spectrophotometric measurements for biologically and physically based rendering

The group of measurements necessary to characterize both the color and surface finish of an object is called the measurement of appearance of an object [4]. This group of measurements involves the spectral energy distribution of propagated light, measured in terms of reflectance and transmittance, and the spatial distribution of that light, measured in terms of the bidirectional reflectance distribution function (BRDF) and the bidirectional transmittance distribution function (BTDF). The variations in the spectral energy distribution affect appearance characteristics such as hue, lightness and saturation, while the changes in the spatial distribution affect appearance characteristics such as gloss, reflection haze, transmission haze, luster and translucency as noted by Hunter and Harold [4]. Measuring these appearance characteristics is crucial for realistic rendering.

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