\pard\tx560\tx1120\tx1680\tx2240\tx2800\tx3360\tx3920\tx4480\tx5040\tx5600\f0\b0\i0\ulnone\fs28\fc0\cf0 Q. If I fill a circle using PostScript, then stroke it with a different color using the default linewidth of 1, not all of the pixels get covered at the edges. I thought a linewidth of 0 could cause this problem, but a linewidth of 1 shouldn't! Drawing applications such as Draw.app demonstrate the same problem: Create a circle filled with black and outlined with white, using a line thickness of 1. You'll notice stray black pixels around the edges. What's going on here? How can this problem be avoided?\
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A. PostScript scanning should normally cause any non-zero linewidth to eliminate the stray pixels in the above scenarios. However, PostScript also has a "stroke adjustment" feature which, when turned on, tries to create lines of uniform thickness on low-resolution output devices (such as displays). This causes the above problems to appear—a line of width 1 drawn on a path might fail to fully cover the pixels on the edges of a fill done on the same path. By default, stroke adjustment is enabled for displays and disabled for printers.\
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Given this, developers of drawing and other applications should look into turning off stroke adjustment when displaying graphic objects created/manipulated by users in documents. This can be accomplished with\
The previous strokeadjust value should be restored once the graphics are drawn; this can be done via gsave/grestore or by explicitly remembering the previous value:\
