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When setting the Opacity option, there are mesh grids on the background of the pdf file. Opacity option should be saved because some shapes may be overlay.

Version:12.2, Windows 10

ff = RegionPlot[x^2 + y^3 < 2, {x, -2, 2}, {y, -2, 2}, PlotStyle -> Directive[Gray, Opacity[0.6]]]
Export["ff.pdf", ff]

Mesh->none option not work. Is there any way to remove the mesh grids when exporting the image?

enter image description here

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    $\begingroup$ Add the setting Method -> {"TransparentPolygonMesh" -> True} to RegionPlot[] and report back. $\endgroup$ – J. M.'s ennui Feb 9 at 7:28
  • $\begingroup$ It does not work. $\endgroup$ – zongxian Feb 9 at 7:32
  • $\begingroup$ Can you mention your OS and version number of Mathematica for reference? $\endgroup$ – J. M.'s ennui Feb 9 at 12:37
  • $\begingroup$ I add the version number and OS: Version 12.2, Windows 10. $\endgroup$ – zongxian Feb 9 at 15:42
  • $\begingroup$ An old but highly related question: (644). $\endgroup$ – Silvia Feb 9 at 19:44
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I get the same meshed result as @zongxian with and without @J.M.'s recommendation. I am using:

$Version
(* "12.2.0 for Microsoft Windows (64-bit) (December 12, 2020)" *)

A possible workaround is to use Region with the appropriate specification like so:

ff = Region[
  Style[ImplicitRegion[x^2 + y^3 < 2, {{x, -2, 2}, {y, -2, 2}}], Gray,
    Opacity[0.6]], PlotTheme -> "Detailed"]
Export["ff.pdf", ff]

The PDF is close to what is desired as shown below:

PDF output

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