Bilder in Ordner automatisch konvertieren. Ab Win 7

# Ordner der zu überwachen ist
$folder = 'd:\bilder'  

function Convert-Image([string]$inPath,[string]$outPath,[System.Drawing.Imaging.ImageFormat]$format){
    Add-Type -AssemblyName System.Drawing
    try{
        if (Test-Path $inPath){
            $ext = [System.IO.Path]::GetExtension($inPath)
            if ($ext -match "bmp|jpg|jpeg|gif|tif|tiff|png"){  
                $img = [System.Drawing.Bitmap]::FromFile($inPath)
                if (!(Test-Path $outPath)){md ([IO.Path]::GetDirectoryName($outpath))}
                $newPath = $outPath; $cnt = 1
                while(Test-Path $newPath){
                    $newpath = [io.Path]::GetDirectoryName($outpath) + "\" + [io.Path]::GetFileNameWithoutExtension($outpath) + "(" + $cnt + ")" +  [io.Path]::GetExtension($outpath)  
                    $cnt++
                }
                $img.Save($newPath, $format)
                $img.Dispose()
                return $true
            }else{
                throw "Kein unterstütztes Format (bmp|jpg|jpeg|gif|tif|tiff|png)!"  
            }
        }
    }catch{
        return $_.Exception.Message
    }
}

# Unregister-Event wenn bereits registriert
Get-EventSubscriber -SourceIdentifier ImageWatcher -EA SilentlyContinue | Unregister-Event
# FS Watcher erstellen
$fsw = New-Object IO.FileSystemWatcher $folder,"*.*" -Property @{IncludeSubdirectories = $false;NotifyFilter = [IO.NotifyFilters]'FileName'}   

Register-ObjectEvent $fsw Created -SourceIdentifier ImageWatcher -Action { 
    $name = $Event.SourceEventArgs.Name
    $fullpath = $Event.SourceEventArgs.FullPath
    $timestamp = get-date $Event.TimeGenerated -Format 'g'  
    Write-Host "$timestamp : Konvertiere: '$fullpath' ... " -fore green -NoNewline  
    $result = Convert-Image -inPath $fullpath -outPath "$([IO.Path]::GetDirectoryName($fullpath))\converted\$([IO.Path]::GetFileNameWithoutExtension($name)).jpg" -format "jpeg"  
    if ($result -eq $true){
        write-host "OK" -fore Cyan  
    }else{
        write-host "$result" -fore Red  
    }
   # Original-Bild wieder löschen 
   Remove-Item $fullpath -Force
}
cls
write-host "Überwache '$folder' auf neue Dateien..." -ForegroundColor Green  

while($true){
    sleep(1)
}