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Abstract:
Although real-world surfaces can exhibit significant variation in materials ---
glossy, diffuse, metallic, etc. --- printers are usually used to reproduce
color or gray-scale images. We propose a complete system that uses appropriate
inks and foils to print documents with a variety of material properties. Given
a set of inks with known Bidirectional Reflectance Distribution Functions
(BRDFs), our system automatically finds the optimal linear combinations to
approximate the BRDFs of the target documents. Novel gamut-mapping algorithms
preserve the relative glossiness between different BRDFs, and halftoning is
used to produce patterns to be sent to the printer. We demonstrate the
effectiveness of this approach with printed samples of a number of measured
spatially-varying BRDFs.
