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I'm trying to save the following plot to PNG with 4x antialiasing

good = Plot3D[Abs[Sqrt[x] + Sqrt[y]], {x, -2, 2}, {y, -2, 2}, 
  PlotPoints -> 100, MeshFunctions -> {#3 &}, Mesh -> 15, 
  Ticks -> None]

is = 400;
Export["good.png", 
 Rasterize[good, ImageSize -> is, RasterSize -> 4*is]]

It looks good in my notebook (left picture) but the resulting PNG is washed out (right picture), any tips? enter image description here

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