string inputFile = "input.psd";
string outputImage20 = "outputImage20.png";
string outputImage200 = "outputImage200.png";

using (PsdImage psdImage = (PsdImage)Image.Load(inputFile, new LoadOptions()))
{
    Layer workLayer = psdImage.Layers[1];

    DropShadowEffect dropShadowEffect = workLayer.BlendingOptions.AddDropShadow();
    dropShadowEffect.Distance = 0;
    dropShadowEffect.Size = 8;

    // ตัวอย่างที่มี Opacity = 20
    dropShadowEffect.Opacity = 20;
    psdImage.Save(outputImage20, new PngOptions());

    // ตัวอย่างที่มี Opacity = 200
    dropShadowEffect.Opacity = 200;
    psdImage.Save(outputImage200, new PngOptions());
}

string sourceFile = "input_825.psd";
string outputPng = "out_psdnet825.png";

using (var psdImage = (PsdImage)Image.Load(sourceFile))
{
    foreach (var item in psdImage.Layers)
    {
        item.IsVisible = false;
    }
    var layer = psdImage.Layers[3];
    psdImage.Layers[1].IsVisible = true;
    psdImage.Layers[3].IsVisible = true;
    psdImage.Layers[4].IsVisible = true;
    psdImage.Layers[7].IsVisible = true;

    var width = layer.Width;
    var height = layer.Height;
    var layerBounds = new Rectangle(layer.Left, layer.Top, width, height);
    var bounds = new Rectangle(0, 0, width, height);
    var image = new PsdImage(bounds.Width, bounds.Height);

    image.SaveArgb32Pixels(bounds, psdImage.LoadArgb32Pixels(layerBounds));

    image.Save(outputPng, new PngOptions());
}

string inputFile = "input.psd";
string outputWithout = "outputWithout.png";
string outputWith = "outputWith.png";

using (PsdImage psdImage = (PsdImage)Image.Load(inputFile, new LoadOptions()))
{
    psdImage.Save(outputWithout, new PngOptions());

    Layer workLayer = psdImage.Layers[1];

    DropShadowEffect dropShadowEffect = workLayer.BlendingOptions.AddDropShadow();
    dropShadowEffect.Distance = 0;
    dropShadowEffect.Size = 8;
    dropShadowEffect.Opacity = 20;

    foreach (ILayerEffect iEffect in workLayer.BlendingOptions.Effects)
    {
        if (iEffect.EffectType == LayerEffectsTypes.DropShadow)
        {
            // มันถูกจับ
            psdImage.Save(outputWith, new PngOptions());
        }
    }
}

string srcFile = "Colorize.psd";            
string outputSimple = "output_simple.png";
string outputColorize = "output_colorize.png";

using (var psdImage = (PsdImage)Image.Load(srcFile))
{
    // รูปภาพโดยไม่มี Colorize property
    psdImage.Save(outputSimple, new PngOptions() { ColorType = PngColorType.TruecolorWithAlpha });
    
    // ตั้งค่า Colorize property
    foreach (Layer layer in psdImage.Layers)
    {
        if (layer is HueSaturationLayer)
        {
            HueSaturationLayer hueSaturationLayer = (HueSaturationLayer)layer;
            hueSaturationLayer.Colorize = true;
            break;
        }
    }
    
    // รูปภาพที่มี Colorize property
    psdImage.Save(outputColorize, new PngOptions() { ColorType = PngColorType.TruecolorWithAlpha });
}