Gtk.PrintSettings.prototype.set_resolution

function set_resolution(resolution:Number):void {
    // Gjs wrapper for gtk_print_settings_set_resolution()
}

Sets the values of %GTK_PRINT_SETTINGS_RESOLUTION, %GTK_PRINT_SETTINGS_RESOLUTION_X and %GTK_PRINT_SETTINGS_RESOLUTION_Y.

Since 2.10

resolution

the resolution in dpi