Shading

The process of altering the brightness and/or color of an image to simulate a third dimension.

[Image processing technique that indicates light source in a three-dimensional display. Sensitivity changes of the electronic camera tube used in image digitizing.

Techniques used to render an object, based on how light sources are positioned. It has also come to describe techniques used to render polygonal models, as:

Flat Shading — Facets of a polygonal model are rendered as a single color based on their orientation to the light and the viewer. Objects appear to have facets like a cut diamond.

Smooth Shading — Techniques that smooth over the facet edges, so the resulting object looks smooth.

Gouraud Shading — A smooth-shading technique that computes different colors at the corners of a polygon and then interpolates these colors across the surfaces.

Phong Shading — A smooth-shading technique that interpolates a surface normal over a polygon and then shades, generating highlights that behave more naturally than those produced by Gouraud shading.

Selected ink for drawing a rule. Choices are black, white, or gray.]

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