04/18/2002
15-462 Graphics I
21
Dithering
•Compensates
for lack of color resolution
•Give
up spatial resolution for color resolution
•Eye
does spatial averaging
•Black/white
dithering to achieve gray scale
–Each
pixel is black or white
–From
far away, color determined by fraction of white
–For
3x3 block, 10 levels of gray scale