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  • $\begingroup$ Many thanks for this answer (and code)! It gets the original 836 kB PDF file to a 239 kB one, so it's still heavier than the RegionPlot-based approach but probably closer to the original ContourPlot (because it's derived from it) and thus more failure-resistant. $\endgroup$ Commented Mar 20, 2012 at 22:07
  • $\begingroup$ @F'x I think the size also depends on how details the (adaptive) sampling ends up being. With MaxRecursion -> 0 the file should be smaller and of worse quality. I'm sure RegionPlot and ContourPlot will differ in how many sampling points they use. Sorry about posting this in a rush, I wrote it on the train while I was offline. I'll read it through again tomorrow. Good night! $\endgroup$ Commented Mar 20, 2012 at 22:31
  • $\begingroup$ Is it possible to generalize this to other mathematica graphics. 3D graphics like a sphere or a pyramid with shading show similar edge artifacts in the PDF. $\endgroup$ Commented Mar 20, 2012 at 23:17
  • 3
    $\begingroup$ @Szabolcs cleanContourPlot seems to work very well, even on ListContourPlot. With the RegionPlot approach of this question, one could also write a cleanContourPlot function, but now there isn't much motivation for that. Next time you could take the bus, then all our plot problems will be fixed. $\endgroup$ Commented Mar 20, 2012 at 23:18
  • $\begingroup$ As a v7 user I cannot test this but +1 for effort if nothing else! $\endgroup$ Commented Mar 21, 2012 at 0:03