Merge pull request #239 from SyncfusionExamples/1005967

1005967: How to replaces the image with text in PDF document

Author: chinnumuniyappan

Image Extraction/Image-to-Text-Replacement-in-PDF/.NET/Image-to-Text-Replacement-in-PDF.slnx

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+<Solution>
+  <Project Path="Image-to-Text-Replacement-in-PDF/Image-to-Text-Replacement-in-PDF.csproj" />
+</Solution>

Image Extraction/Image-to-Text-Replacement-in-PDF/.NET/Image-to-Text-Replacement-in-PDF/Data/Input.pdf

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <RootNamespace>Image_to_Text_Replacement_in_PDF</RootNamespace>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Syncfusion.Pdf.Imaging.Net.Core" Version="*" />
+  </ItemGroup>
+
+</Project>

Image Extraction/Image-to-Text-Replacement-in-PDF/.NET/Image-to-Text-Replacement-in-PDF/Image-to-Text-Replacement-in-PDF.csproj

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+using Syncfusion.Pdf;
+using Syncfusion.Pdf.Exporting;
+using Syncfusion.Pdf.Graphics;
+using Syncfusion.Pdf.Parsing;
+
+// Load the input PDF document
+using (PdfLoadedDocument document = new PdfLoadedDocument(Path.GetFullPath(@"Data/Input.pdf")))
+{
+    // Loop through every page in the PDF
+    foreach (PdfLoadedPage page in document.Pages)
+    {
+        PdfLoadedPage loadedPage = page as PdfLoadedPage;
+        // Get graphics object to draw on the page
+        PdfGraphics graphics = loadedPage.Graphics;
+        // Get all images present in the current page
+        PdfImageInfo[] imageInfos = loadedPage.GetImagesInfo();
+        // If no images found, skip this page
+        if (imageInfos == null || imageInfos.Length == 0) continue;
+        // Font for overlay text
+        PdfFont font = new PdfStandardFont(PdfFontFamily.Helvetica, 12f);
+        // Center the overlay text inside the image area
+        PdfStringFormat centerFormat = new PdfStringFormat
+        {
+            Alignment = PdfTextAlignment.Center,
+            LineAlignment = PdfVerticalAlignment.Middle
+        };
+        // Save the current graphics state
+        graphics.Save();
+        // Draw overlay text ("Image removed") on top of each image area
+        foreach (PdfImageInfo info in imageInfos)
+        {
+            string overlayText = "Image removed";
+
+            graphics.DrawString(
+                overlayText,
+                font,
+                PdfBrushes.Red,
+                info.Bounds,       // Draw the text inside the image area
+                centerFormat
+            );
+        }
+        // Restore the graphics state after drawing
+        graphics.Restore();
+        // Remove the images from the PDF page
+        foreach (PdfImageInfo info in imageInfos)
+        {
+            loadedPage.RemoveImage(info);
+        }
+    }
+    // Save the output PDF
+    document.Save(Path.GetFullPath(@"Output/Output.pdf"));
+}
+