kraken-net1.cs

var request = new OptimizeSetUploadWaitRequest()
{
    // Request level settings
    Lossy = true,
};
request.AddSet(new ResizeImageSet {
    // Individual  settings
    Name = "set1", Height = 10, Width = 10, Lossy = false
});
request.AddSet(new ResizeImageSet {
    // Individual  settings
    Name = "set2", Height = 15, Width = 15, SamplingScheme = SamplingScheme.S444
});

var response = client.OptimizeWait("c:\your-image-location-on-disk.jpeg", request);

if(response.Result.StatusCode == HttpStatusCode.OK)
{
      foreach (var item in result.Body.Results)
      {
           var url = item.KrakedUrl;
      }
}

kraken-net1.ps1

$files = Get-ChildItem 'C:\path\..\myfolder' -Filter *.png, *.jpg, *.jpeg
$result = Optimize-ImageToS3 -FilePath $files.FullName -Key $key -Secret $secret -Wait $true `
 -AmazonKey $amazonKey -AmazonSecret $amazonSecret -AmazonBucket  $amazonBucket -S3Path 'powershell/' 
$result | Format-Table