Browse Prior Art Database

Copy Operation for Color Antialiasing

IP.com Disclosure Number: IPCOM000063601D
Original Publication Date: 1985-Mar-01
Included in the Prior Art Database: 2005-Feb-18

Publishing Venue

IBM

Related People

Authors:
Evangelisti, CJ Lumelsky, L Sholtz, PN [+details]

Abstract

The problem of preventing the "jaggies" or "staircasing" is important in the field of graphics. In gray scale displays one approach is to store a prefiltered source image in the cache part of the frame buffer and then copy directly into the visible part of the frame buffer. The intermediate gray scale levels of intensity cannot be used directly for color images because the foreground colors in source and background colors in the destination need to be known to perform the final assignment of pixel (picture element) values. A method is described herein for creating copies of colored antialiased objects where source and destination colors may be arbitrary. The copy operation uses three areas of the frame buffer. The destination (D) is the area in the frame buffer where an antialiased object is to be copied.