public string Execute(FileItem item, string infile, string dest, ValuePairEnumerator configData)
        {
            try
            {
                var conf = new ChromakeyViewModel(configData);
                dest = Path.Combine(Path.GetDirectoryName(dest), Path.GetFileNameWithoutExtension(dest) + ".jpg");

                KalikoImage image  = new KalikoImage(infile);
                var         x      = (System.Windows.Media.Color)System.Windows.Media.ColorConverter.ConvertFromString(conf.BackgroundColor);
                var         filter = new ChromaKeyFilter();
                filter.KeyColor             = Color.FromArgb(x.R, x.G, x.B);
                filter.ToleranceHue         = conf.Hue;
                filter.ToleranceSaturnation = conf.Saturnation / 100f;
                filter.ToleranceBrightness  = conf.Brigthness / 100f;
                image.ApplyFilter(filter);
                var res = image.Clone();

                if (conf.UnsharpMask)
                {
                    res.ApplyFilter(new UnsharpMaskFilter(1.4f, 1.32f, 5));
                }

                var backdrop = new KalikoImage(conf.BackgroundFile);
                backdrop = backdrop.Scale(new FitScaling(image.Width, image.Height));
                backdrop.BlitImage(res);

                backdrop.SaveJpg(dest, 90);
                return(dest);
            }
            catch (Exception e)
            {
                Log.Debug("Chromakey error", e);
            }
            return(null);
        }