SetFillColorAlpha not printed on eps or ps

ROOT
1

I am trying to print a plot in eps or ps format but the points with SetFillColorAlpha are not transparent. I do not want to print png due resolution, and cannot use pdf because I am adding a logo.

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ROOT Version: 6.18/04
Platform: MacOs 10.15.7
Compiler: Apple clang version 12.0.0

2

Here one can read:

The transparency is available on all platforms when the flag OpenGL.CanvasPreferGL is set to 1 in $ROOTSYS/etc/system.rootrc , or on Mac with the Cocoa backend. On the file output it is visible with PDF, PNG, Gif, JPEG, SVG, TeX … but not PostScript.