Name: Polynomial Texture Map
Description: Developed by Hewlett Packard, Polynomial texture maps (PTMs) are an extension to conventional texture maps that allow enhanced image quality. As opposed to storing a color per pixel, these PTM’s store second-order bi-quadratic polynomial coefficients per pixel. These polynomials model the changes that appear to a pixel color based on either light source position or viewing direction.
sameAs : PRONOM: http://www.nationalarchives.gov.uk/PRONOM/fmt/519
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