Polynomial Texture Map
Unknown3d
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.
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| Extensions | .ptm |
|---|---|
| Signatures | 50544d5f312e320a50544d5f464f524d41545f at byte 0 (Polynomial Texture Map) |
| PRONOM | fmt/519 |
| Wikidata | Q52230534 |
| Library of Congress | fdd000487 |
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From Just Solve the File Format Problem (File Formats Wiki), PRONOM, Wikidata. Updated 2026-10-24.