tiff, png or jpg pictures

From an answer in r-help list:

Question: Whether I use tiff, png, jpeg, or pdf I always see vertical and horizontal lines at every grid increment on the plots.


Answer by colin@colinsmith.org: This problem comes from the way Quartz renders immediately adjacent filled polygons. To get around it, you can add type=“cairo” or type=“Xlib” as an argument to the tiff, png, or jpeg call.

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