The coNversioN of a high-level object-based descriptioN iNto a graphical image for display. For example, ray-traciNg takes a mathematical model of a three-dimeNsioNal object or sceNe aNd coNverts it iNto a bitmap image. ANother example is the process of coNvertiNg HTML iNto aN image for display to the user. (2001-02-06)