public string DisplayImage(object imageData)
{
NSCursor.SetHiddenUntilMouseMoves(true);
// To work around possible problems in Mono's NSImage dispose: https://bugzilla.xamarin.com/show_bug.cgi?id=15081
System.GC.Collect();
var dataObject = (NSData) imageData;
var image = new NSImage(dataObject);
var imageRep = image.BestRepresentationForDevice(null);
SizeF imageSize = new SizeF(imageRep.PixelsWide, imageRep.PixelsHigh);
image.Size = imageSize;
imageView.Image = image;
var filterName = ApplyFilter(true);
dataObject.Release();
return string.Format("filter {0}", filterName);
}