gist:7677d654c1357ee6d3ae1a1dc246c3b6

// Set resolution options
  var rp = [72,150,300];

// Set EXPORT presets
    app.pngExportPreferences.exportResolution = 72;
    app.pngExportPreferences.antiAlias = true;
    app.pngExportPreferences.pngQuality = PNGQualityEnum.MAXIMUM;
    app.pngExportPreferences.pngColorSpace = PNGColorSpaceEnum.RGB;
    app.pngExportPreferences.pngExportRange = PNGExportRangeEnum.EXPORT_RANGE;