13 March 2015 Controlling colour-printed gloss by varnish-halftones
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Printing appearance effects beyond colour - such as gloss - is an active research topic in the scope of multi-layer printing (2.5D or 3D printing). Such techniques may enable a perceptually more accurate reproduction of optical material properties and are required to avoid appearance related artefacts sometimes observed in regular colour printing - such as bronzing and differential gloss. In addition to technical challenges of printing such effects, a perceptual space that describes the related visual attributes is crucial; particularly to define perceptually meaningful tolerances and for appearance gamut mapping. In this paper, we focus on spatially-varying gloss created by varnish-halftones. This enables us to print specular gloss effects covering a large portion of the NCS gloss scale from full matte to high gloss. We then conduct a psychophysical experiment to find the relationship between measured specular gloss and a perceptually uniform gloss scale. Our results show that this relationship can be well described by a power function according to Stevens Power Law.
© (2015) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Sepideh Samadzadegan, Sepideh Samadzadegan, Teun Baar, Teun Baar, Philipp Urban, Philipp Urban, Maria V. Ortiz Segovia, Maria V. Ortiz Segovia, Jana Blahová, Jana Blahová, "Controlling colour-printed gloss by varnish-halftones", Proc. SPIE 9398, Measuring, Modeling, and Reproducing Material Appearance 2015, 93980V (13 March 2015); doi: 10.1117/12.2080805; https://doi.org/10.1117/12.2080805


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