C# and .NET: Advanced Image Manipulation in PDFs

Working with images in PDF documents is an important part of software development, especially when it comes to creating reports, brochures, or any other documents where precise placement and manipulation of graphic elements are required. In this article, we will look at how to use C# and . You can control the positioning and transformations of images in PDF documents using the components of SautinSoft PDF .Net.

It is important to understand several key points related to image processing in PDF:

  • Positioning: Determines the location of the image on the page.
  • Transformation: Includes zooming, rotating and reflecting the image.
    1. Add SautinSoft.PDF from NuGet.
    2. Load an image from a file.
    3. Set the location of the four images at the corners of the page.
    4. Draw four images and do: Scale, Rotate, Mirror, Transform.
    5. Save the document.

    Using SautinSoft PDF .Net for working with images in PDF documents in C# and .NET allows developers to easily integrate complex graphical operations into their applications. Thanks to the powerful functions of the library, you can precisely control the location and transformations of images, which makes creating professional-looking PDF documents a simple and efficient process.

    Complete code

    using System;
using SautinSoft.Pdf;
using System.IO;
using SautinSoft.Pdf.Content;

class Program
{
    /// <summary>
    /// Export and import images to PDF file.
    /// </summary>
    /// <remarks>
    /// Details: https://sautinsoft.com/products/pdf/help/net/developer-guide/image-positioning-and-transformations.php
    /// </remarks>
    static void Main()
    {
        // Before starting this example, please get a free 100-day trial key:
        // https://sautinsoft.com/start-for-free/

        // Apply the key here:
        // PdfDocument.SetLicense("...");

        using (var document = new PdfDocument())
        {
            var page = document.Pages.Add();

            // Load the image from a file.
            var image = PdfImage.Load(@"..\..\..\submit.png");

            double margin = 50;

            // Set the location of the first image in the top-left corner of the page (with a specified margin).
            double x = margin;
            double y = page.CropBox.Top - margin - image.Size.Height;

            // Draw the first image.
            page.Content.DrawImage(image, new PdfPoint(x, y));

            // Set the location of the second image in the top-right corner of the page (with the same margin).
            x = page.CropBox.Right - margin - image.Size.Width;
            y = page.CropBox.Top - margin - image.Size.Height;

            // Initialize the transformation.
            var transform = PdfMatrix.Identity;
            // Use the translate operation to position the image.
            transform.Translate(x, y);
            // Use the scale operation to resize the image.
            // NOTE: The unit square of user space, bounded by user coordinates (0, 0) and (1, 1),
            // corresponds to the boundary of the image in the image space.
            transform.Scale(image.Size.Width, image.Size.Height);
            // Use the scale operation to flip the image horizontally.
            transform.Scale(-1, 1, 0.5, 0);

            // Draw the second image.
            page.Content.DrawImage(image, transform);

            // Set the location of the third image in the bottom-left corner of the page (with the same margin).
            x = margin;
            y = margin;

            // Initialize the transformation.
            transform = PdfMatrix.Identity;
            // Use the translate operation to position the image.
            transform.Translate(x, y);
            // Use the scale operation to resize the image.
            transform.Scale(image.Size.Width, image.Size.Height);
            // Use the scale operation to flip the image vertically.
            transform.Scale(1, -1, 0, 0.5);

            // Draw the third image.
            page.Content.DrawImage(image, transform);

            // Set the location of the fourth image in the bottom-right corner of the page (with the same margin).
            x = page.CropBox.Right - margin - image.Size.Width;
            y = margin;

            // Initialize the transformation.
            transform = PdfMatrix.Identity;
            // Use the translate operation to position the image.
            transform.Translate(x, y);
            // Use the scale operation to resize the image.
            transform.Scale(image.Size.Width, image.Size.Height);
            // Use the scale operation to flip the image horizontally and vertically.
            transform.Scale(-1, -1, 0.5, 0.5);

            // Draw the fourth image.
            page.Content.DrawImage(image, transform);

            document.Save("PositioningTransformations.pdf");
        }
        System.Diagnostics.Process.Start(new System.Diagnostics.ProcessStartInfo("PositioningTransformations.pdf") { UseShellExecute = true });
    }
}

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    We are developing .Net components since 2002. We know PDF, DOCX, RTF, HTML, XLSX and Images formats. If you need any assistance with creating, modifying or converting documents in various formats, we can help you. We will write any code example for you absolutely free.