The Clapper-Yule model is a physically based model describing the reflection of spectral light fluxes by a printed surface and enabling the prediction of halftone prints on diffusing substrates . The model relies on a closed-form equation obtained by describing the multiple transfers of light between the substrate and the print-air interface through the inks. Physical parameters are attached to the inks, the diffusing support, and the surface. The model assumes that the lateral propagation distance of light within the substrate, due to scattering, is much larger than the halftone screen period. Most photons therefore cross different ink dots while traveling in the print. The reflections and transmissions of light at the surface are explicitly taken into account depending on the print’s refractive index, as well as the considered illumination and measuring geometries.
The Clapper-Yule Equation
KeywordsSurface Coverage Spectral Reflectance Measuring Geometry Halftone Pattern White Primary
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