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The GL defines four kinds of pixel groups:
- RGBA component: Each group comprises four color components:
red, green, blue, and alpha.
- Depth component: Each group comprises a single depth component.
- Color index: Each group comprises a single color index.
- Stencil index: Each group comprises a single stencil index.
Each operation described in this section is applied sequentially to each
pixel group in an image.
Many operations are applied only to pixel groups of certain kinds;
if an operation is not applicable to a given group, it is skipped.
Future versions of GL may define additional pixel transfer operations.
David Blythe
Sat Mar 29 02:23:21 PST 1997