{ 
TCanvas *c1 = new TCanvas("c1","transparent pad",200,10,700,500); 
c1->SetFillStyle(4000); 
c1->SetFrameFillStyle(4000); 
TPad *pad1 = new TPad("pad1","",0,0,1,1); 
pad1->SetFillStyle(4000); //will be transparent 
pad1->SetFrameFillStyle(4000); 
pad1->Draw(); 
pad1->cd(); 

TH1F* h = new TH1F("h","h",100,-5,5); 
h->FillRandom("gaus"); 

h->SetFillStyle(4000); 
h->Draw(); 

pad1->Update(); //this will force the generation of the "stats" box 
pad1->Modified(); 
c1->cd(); 
c1->SaveAs("./test.pdf");
c1->SaveAs("./test.eps");
c1->SaveAs("./test.png");
}