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Adding Images with a Shadow in PDF Documents


Version Product Author
2024.2.426 RadPdfProcessing Desislava Yordanova


When inserting an image into a PDF document using the Block.InsertImage method, you might want to add a shadow effect to enhance its appearance. RadPdfProcessing provides functionalities to draw paths and geometries, enabling the simulation of shadows around images. This KB article demonstrates how to add a shadow to an image in a PDF document.


To add a shadow to an image, utilize paths with specific geometries to simulate the shadow effect. The following example outlines the necessary steps to insert an image and draw a shadow around it using RadPdfProcessing:

  1. Prepare the environment: Ensure that ImagePropertiesResolver and JpegImageConverter are set for cross-platform image scenarios. Refer to the RadPdfProcessing documentation on cross-platform image handling.

  2. Insert the image: Use the Block.InsertImage method to insert the image into a block.

  3. Draw the shadow: Create a RectangleGeometry around the image's location with an offset to simulate the shadow effect. Use a dark color for the shadow and adjust its opacity as needed.

  4. Export the PDF document: Use the PdfFormatProvider to export the document to a PDF file.

public static Padding pageMarginsValue = new Telerik.Windows.Documents.Primitives.Padding(
     Unit.MmToDip(20), //left
     Unit.MmToDip(20), //top
     Unit.MmToDip(0),  //right
     Unit.MmToDip(0)); //bottom

static void Main(string[] args)
    // Setup the environment for image handling
    Telerik.Documents.ImageUtils.ImagePropertiesResolver defaultImagePropertiesResolver = new Telerik.Documents.ImageUtils.ImagePropertiesResolver();
    Telerik.Windows.Documents.Extensibility.FixedExtensibilityManager.ImagePropertiesResolver = defaultImagePropertiesResolver;
    Telerik.Windows.Documents.Extensibility.JpegImageConverterBase defaultJpegImageConverter = new Telerik.Documents.ImageUtils.JpegImageConverter();
    Telerik.Windows.Documents.Extensibility.FixedExtensibilityManager.JpegImageConverter = defaultJpegImageConverter;

    RadFixedDocument fixedDocument = new RadFixedDocument();
    RadFixedPage fixedPage = fixedDocument.Pages.AddPage();
    FixedContentEditor fixedContentEditor = new FixedContentEditor(fixedPage);

    using (Stream imageStream = File.OpenRead("ninja.png"))
        Block imageBlock = new Block();
        imageBlock.SpacingAfter = 0;
        imageBlock.HorizontalAlignment = Telerik.Windows.Documents.Fixed.Model.Editing.Flow.HorizontalAlignment.Center;
        Telerik.Windows.Documents.Fixed.Model.Resources.ImageSource _imageSource =
            new Telerik.Windows.Documents.Fixed.Model.Resources.ImageSource(imageStream);
        Size imageBlockDesiredSize = imageBlock.Measure();
        int shadowWidth = 10;

        // DrawShadow
        RectangleGeometry rectangleGeometry = new RectangleGeometry();
        rectangleGeometry.Rect = new Rect(pageMarginsValue.Left + shadowWidth, pageMarginsValue.Top + shadowWidth, imageBlockDesiredSize.Width, imageBlockDesiredSize.Height);
        Telerik.Windows.Documents.Fixed.Model.Graphics.Path path = fixedPage.Content.AddPath();
        path.IsFilled = true;
        path.IsStroked = false;
        RgbColor shadowColor = new RgbColor(80, 0, 0, 0);
        path.Fill = shadowColor;
        path.Geometry = rectangleGeometry;


        // Export the document
        PdfFormatProvider provider = new PdfFormatProvider();
        string outputFilePath = @"sample.pdf";
        using (Stream output = File.OpenWrite(outputFilePath))
            provider.Export(fixedDocument, output);
        Process.Start(new ProcessStartInfo() { FileName = outputFilePath, UseShellExecute = true });

Image Shadon in PDF

Adjust the shadow's size, color, and opacity according to your requirements. This approach can be customized to fit specific needs or visual styles.


  • The provided example is a basic approach to simulating a shadow and might not cover all use cases.
  • Experiment with different geometry shapes and colors to achieve the desired shadow effect.

See Also

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