Apply Gaussian Blur Filter to an Image in C# .NET

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Gaussian Blur.cs

string sourceFile = "layers.psd";
string outputPsd = "out_test.psd";
string outputPng = "out_test.png";

using (var image = (PsdImage)Image.Load(sourceFile))
{
    SmartObjectLayer smartLayer = (SmartObjectLayer)image.Layers[1];
    Layer maskLayer = image.Layers[2];
    Layer regularLayer = image.Layers[3];

    // Apply Gaussian blur filter
    GaussianBlurSmartFilter gaussianBlur = new GaussianBlurSmartFilter();
    gaussianBlur.Radius = 10;
    gaussianBlur.Opacity = 50;

    // Apply filter to SmartObject
    gaussianBlur.Apply(smartLayer);
    smartLayer.SmartFilters.UpdateResourceValues();
    smartLayer.UpdateModifiedContent();

    // Apply filter to layer mask
    gaussianBlur.ApplyToMask(maskLayer);

    // Apply filter to layer
    gaussianBlur.Apply(regularLayer);

    // Save output as PSD and PNG Image
    image.Save(outputPsd);
    image.Save(outputPng, new ImageOptions.PngOptions() { ColorType = PngColorType.TruecolorWithAlpha });
}