Abstract: The drawing of realistic graphics often deals with the antialiasing of color line on the background taken from the real world. The effect of antialiasing is not only with the foreground, but also with background. The fact of antialiasing is the merge from the foreground to background color. The calculation formula of adjacent pixel color consists of both foreground color and background color. It is proposed that antialiasing algorithm of color line expands the Wu Anti-aliasing algorithm to a level of background, deepening the antialiasing theory.

Key words: computer application, color line, antialiasing, back color