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.
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.