Smooth vertical motion via color palette manipulation.

摘要

Smooth vertical movement of a graphics image on a raster display (48) is performed via color palette manipulation at any speed. A color look-up table (42) has a color palette position for each color within the graphics image plus unassigned color palette positions that are assigned to pixels on the top of horizontal color edges of the graphics image. During movement of the graphics image the color values of the assigned color palette positions are updated each display cycle as a function of a desired rate of vertical movement of the graphics image.