$im_convert_exe = "convert.exe"
$srcname = "C:ScaninputTest_*.tiff"
$destname = "C:ScanmergedScansMerge.tiff"

$cmdline =  $im_convert_exe + " `"" + $srcname + "`"" + " `"" + $destname + "`""
echo $cmdline
invoke-expression -command $cmdline