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SGIA

Specialty Graphic Imaging Association

absolute white

As defined in the SGIA Glossary for the specialty imaging community.

In theory a material that perfectly reflects all light energy at every visible wavelength; in practice a solid white with known spectral data that is used as the "reference white" for all measurements of absolute reflectance. (When calibrating a spectrophotometer, often a white ceramic plaque is measured and used as the absolute white reference).