void writeFile() {
	
	gStyle->SetStatColor(0);
	gStyle->SetTitleFillColor(0);
	gStyle->SetCanvasColor(0);
	gStyle->SetPadColor(0);
	gStyle->SetPadBorderMode(0);
	gStyle->SetCanvasBorderMode(0);
	gStyle->SetFrameBorderMode(0);
	
	TCanvas *MyC = new TCanvas("MyC","",400,300);

	TPad *pad1 = new TPad("pad1","",0,0,1,1); 
	pad1->Draw(); 
	pad1->cd(); 
		
	TF1 f1("fun1","sin(x)/x",0,10);
	f1.SetFillStyle(4000); 
	f1.Draw();
		
	MyC->SaveAs("MyC.gif");
	
   	TImage::EImageFileTypes gtype = TImage::kPng;
   	
	TImage* img = TImage::Create();
	img->FromPad( pad1 );
	UInt_t* myRGBpointer = img->GetArgbArray();
	int myWidth = img->GetWidth();
	int myHeight = img->GetHeight();
	cout << "width size = " << myWidth <<endl;
	cout << "height size = " << myHeight <<endl;
	int red,green,blue,alpha;
	for(int i=0; i< myWidth*myHeight; i++) {
		red 	= (((myRGBpointer[i])>>16)&0x00FF);
		green 	= (((myRGBpointer[i])>> 8)&0x00FF);
		blue	= ( (myRGBpointer[i])     &0x00FF);
		alpha	= (((myRGBpointer[i])>>24)&0x00FF);
		
		printf(" %7d  %12d  %3d  %3d  %3d  %3d\n", i, myRGBpointer[i], alpha, red, green, blue );

		if( red == 255 && green == 255 && blue == 255 ) alpha = 0;		
		myRGBpointer[i] =  	( ( alpha&0x00FF)<<24) |
 							( (   red&0x00FF)<<16) | 
                            ( ( green&0x00FF)<< 8) |
                            (    blue&0x00FF) ;	       

	}
	
	UInt_t* myRGBpointerNEW = img->GetArgbArray();
	for(int i=0; i< myWidth*myHeight; i++) {
		red 	= (((myRGBpointerNEW[i])>>16)&0x00FF);
		green 	= (((myRGBpointerNEW[i])>> 8)&0x00FF);
		blue	= ( (myRGBpointerNEW[i])     &0x00FF);
		alpha	= (((myRGBpointerNEW[i])>>24)&0x00FF);
		printf(" %7d  %12d  %3d  %3d  %3d  %3d\n", i, myRGBpointerNEW[i], alpha, red, green, blue );
	}
	
	img->WriteImage("imma.png", gtype);
	
}