Reflectance paper
{{Multiple issues|{{Advert|2=This article appears like an advertisement for the described technology, contains only marginal information that is almost a verbatim copy of the text found at the linked references.|date=October 2017}}
{{Notability|date=November 2020}}}}
Reflectance paper is a surface that contains a lattice of mirrored dimples.
Design
The paper is printed with color and the angle-dependent reflectance function for each pixel of an image captured with a light field camera such as a Lytro. {{Cite web |last=Group |first=SAE Media |title=Reflectance Paper' Can Reflect Light Like Physical Object |url=https://www.techbriefs.com/component/content/article/30363-printing-reflectance-functions |access-date=2024-04-14 |website=www.techbriefs.com |language=en}} The image displays differently depending on the angle of incident light in the viewing environment. This technique can be used to display the image of a sculpture with its direction-dependent shadow depending on the angle of the light.
History
In 2012, researchers at the University of California, Santa Cruz, Hewlett-Packard Laboratories and 3M created the first type of this kind of paper using a hexagonal lattice of millimeter-sized dimples. Dimple depth was 50μm, representing 70% of a hemisphere. Mirroring used silver or sputtered aluminum. A 32×32 matrix of light-field information was printed on a transparent mask over the dimples.{{cite web |first=Brian |last=Dodson |url=http://www.gizmag.com/reflectance-paper-3d-photographic-prints/23734/ |title=Reflectance paper displays photographs in a new light |publisher=Gizmag.com |date=2012-08-21 |accessdate=2012-08-27 }}{{cite web |last=Wallace |first=John |url=http://www.laserfocusworld.com/articles/2012/08/siggraph-images-printed-on-reflectance-paper-reflect-light-like-3d-objects.html |title=SIGGRAPH: Images printed on 'reflectance paper' reflect light like 3D objects |publisher=Laser Focus World |date=2012-08-14 |accessdate=2012-09-06 }}