How to set layer property

        var psdProcessor = new PsdProcessor(Path.GetTempPath());
        var picture = "picture.jpg";

        file.SaveAs(mappath + picture);

                psdProcessor.FrameCallback = (processor, frame) =>
                {
                    if (frame.Type != FrameType.SmartObject || frame.Name != "Design")
                        return processor.ProcessFrame(frame);

                    var smartFrame = (PsdSmartFrame)frame;

        //I want to set smartFrame blendmode here

        var image = ImageReader.Create(mappath + picture);

        var container = smartFrame.ToGraphicsContainer(image + , ResizeMode.ImageFill);
                    return container;
                };

        psdProcessor.Render(mappath + "env.psd", mappath + "picture.png");