global proc ho_mergeImg(){
	
	int $f = (int)`currentTime -q`;
	int $startFrame = (int)`getAttr defaultRenderGlobals.startFrame`;
	int $endFrame = (int)`getAttr defaultRenderGlobals.endFrame`;
	string $imageFilePrefix = `getAttr defaultRenderGlobals.imageFilePrefix`;
	
	string $imgFolder,$fg,$bg,$out,$compCmd,$parameter;
	string $imgFolder = "/home/hchang21/SFDM-PROJECT/VSFX/caveman/sam/samProject/renderman/test_multiout_02/images/";

	$fg = $imgFolder + $imageFilePrefix +"."+$f+".tif";
	$tmp = $imgFolder + "tmp.tif";
	
	if($f > $startFrame){
		$bg = $imgFolder + $imageFilePrefix +"."+($f-1)+".tif";
	
		$parameter = $tmp + "=" + $fg + " over " + $bg+"\n";
		$compCmd = "tiffcomp " + $parameter;
		system($compCmd);
		
		string $delCmd;
		$delCmd  = "rm "+$imgFolder+$fg;
		system($delCmd);

		string $renameCmd = "mv "+$tmp+" "+$fg+"\n";
		system($renameCmd);
	}
}