Searching the newsgroup for an answer to this one didn't turn up any
matches (but I think I know a lot more about ground planes/polygons now!).
I have designed a double-sided board with ground planes on both sides
of the board. When I print (as in File->print) the board with output
to a Postscript file, then view it (using evince - I'm running Ubuntu
by the way), I see both the top and bottom ground planes have small
horizontal slits in them. A photo is worth 1000 words as they say.
Notice that the edge of the polygon is never affected, just the
inside. Other signals (the regular looking traces in the image)
appear just fine as well. The width of the polygon affects the
spacing of the streaking. It's like there isn't any overlap of the
lines used to create the solid fill, and sometimes we see 'through'
between the lines.
I have also tried printing to a 'PDF printer' - a driver that acts
like a printer to the app, but redirects output to a file in PDF
format. Using xpdf to view that file also shows the streaking effect.
This doesn't seem to affect the CAM files. I have viewed those using
ViewMate without any streaking apparent.
All this has arisen because I wish to send a PDF of my layout to
someone for checking. They don't run Eagle so I need some image
format that they can read. I suspect I'll get a ribbing from them for
not running Protel; grr!
Any ideas how to stop this odd phenomenon would be appreciated.
Photo attached (hopefully).
-Martin
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