> For the complete documentation index, see [llms.txt](https://docs.apryse.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.apryse.com/uwp/get-started/samples/imageextracttest.md). # ImageExtract Here is a sample showcasing how to extract image from pdf using UWP. Run the sample with Apryse SDK free trial. Sample code for using Apryse UWP SDK to extract images from PDF files, along with their positioning information and DPI. Instead of converting PDF images to a Bitmap, you can also extract uncompressed/compressed image data directly using element.GetImageData() (described in the [PDF Data Extraction](/uwp/get-started/samples/elementreaderadvtest.md) code sample). Learn more about our full [PDF Data Extraction SDK Capabilities](https://apryse.com/capabilities/extraction). To start your free trial, [get stated with UWP SDK](/uwp/get-started/get-started.md). {% tabs %} {% tab title="C#" %} {% code lineNumbers="true" %} ```csharp // // Copyright (c) 2001-2020 by PDFTron Systems Inc. All Rights Reserved. // using System; using System.IO; using System.Threading.Tasks; using Windows.Foundation; using pdftron.Common; using pdftron.PDF; using pdftron.SDF; using PDFNetUniversalSamples.ViewModels; namespace PDFNetSamples { public sealed class ImageExtractTest : Sample { public ImageExtractTest() : base("ImageExtract", "This sample illustrates couple of approaches to PDF image extraction.") { } public override IAsyncAction RunAsync() { return Task.Run(new System.Action(async () => { WriteLine("--------------------------------"); WriteLine("Starting ImageExtract Test..."); WriteLine("--------------------------------\n"); // Example 1: // Extract images by traversing the display list for // every page. With this approach it is possible to obtain // image positioning information and DPI. try { String input_file_path = Path.Combine(InputPath, "newsletter.pdf"); WriteLine("Opening input file " + input_file_path); PDFDoc doc = new PDFDoc(input_file_path); doc.InitSecurityHandler(); ElementReader reader = new ElementReader(); PageIterator itr; for (itr = doc.GetPageIterator(); itr.HasNext(); itr.Next()) { reader.Begin(itr.Current()); await ImageExtract(reader).ConfigureAwait(false); reader.End(); } doc.Destroy(); WriteLine("Done."); } catch (Exception e) { WriteLine(GetExceptionMessage(e)); } WriteLine("----------------------------------------------------------------"); // Example 2: // Extract images by scanning the low-level document. try { String input_file_path = Path.Combine(InputPath, "newsletter.pdf"); PDFDoc doc = new PDFDoc(input_file_path); doc.InitSecurityHandler(); image_counter = 0; SDFDoc cos_doc = doc.GetSDFDoc(); int num_objs = cos_doc.XRefSize(); for (int i = 1; i < num_objs; ++i) { Obj obj = cos_doc.GetObj(i); if (obj != null && !obj.IsFree() && obj.IsStream()) { // Process only images DictIterator itr = obj.Find("Subtype"); if (!itr.HasNext() || itr.Value().GetName() != "Image") continue; itr = obj.Find("Type"); if (!itr.HasNext() || itr.Value().GetName() != "XObject") continue; pdftron.PDF.Image image = new pdftron.PDF.Image(obj); WriteLine(string.Format("--> Image: {0}", ++image_counter)); WriteLine(string.Format(" Width: {0}", image.GetImageWidth())); WriteLine(string.Format(" Height: {0}", image.GetImageHeight())); WriteLine(string.Format(" BPC: {0}", image.GetBitsPerComponent())); string fname = Path.Combine(OutputPath, "image_extract2_" + image_counter.ToString() + ".png"); image.ExportAsPng(fname); // or Export() to automatically select format WriteLine("Image exported to " + fname); await AddFileToOutputList(fname).ConfigureAwait(false); // Convert PDF bitmap to GDI+ Bitmap... //Bitmap bmp = image.GetBitmap(); //bmp.Save(fname, ImageFormat.Png); // // Instead of converting PDF images to a Bitmap, you can also extract // uncompressed/compressed image data directly using element.GetImageData() // as illustrated in ElementReaderAdv sample project. } } doc.Destroy(); WriteLine("Done."); } catch (Exception e) { WriteLine("\n" + e.ToString()); } WriteLine("\n--------------------------------"); WriteLine("Done ImageExtract Test."); WriteLine("--------------------------------\n"); })).AsAsyncAction(); } ///----------------------------------------------------------------------------------- /// This sample illustrates one approach to PDF image extraction /// using PDFNet. /// /// Note: Besides direct image export, you can also convert PDF images /// to GDI+ Bitmap, or extract uncompressed/compressed image data directly /// using element.GetImageData() (e.g. as illustrated in ElementReaderAdv /// sample project). ///----------------------------------------------------------------------------------- int image_counter = 0; async Task ImageExtract(ElementReader reader) { String result = ""; Element element; while ((element = reader.Next()) != null) { switch (element.GetType()) { case ElementType.e_image: case ElementType.e_inline_image: { result += (string.Format("--> Image: {0}\n", ++image_counter)); result += (string.Format(" Width: {0}\n", element.GetImageWidth())); result += (string.Format(" Height: {0}\n", element.GetImageHeight())); result += (string.Format(" BPC: {0}\n", element.GetBitsPerComponent())); Matrix2D ctm = element.GetCTM(); //double x2 = 1, y2 = 1; //ctm.Mult(ref x2, ref y2); /* pdftron.Common.Double x2 = new pdftron.Common.Double(1); pdftron.Common.Double y2 = new pdftron.Common.Double(1); ctm.Mult(x2, y2); Message += string.Format("\n Coords: x1={0}, y1={1}, x2={2}, y2={3}", ctm.m_h, ctm.m_v, x2, y2); */ if (element.GetType() == ElementType.e_image) { string fname = Path.Combine(OutputPath, "image_extract1_" + image_counter.ToString() + ".tif"); pdftron.PDF.Image image = new pdftron.PDF.Image(element.GetXObject()); image.ExportAsTiff(fname); // or Export() to automatically select format WriteLine("Image exported to " + fname); await AddFileToOutputList(fname).ConfigureAwait(false); // Convert PDF bitmap to GDI+ Bitmap... //Bitmap bmp = element.GetBitmap(); //bmp.Save(fname, ImageFormat.Png); // // Instead of converting PDF images to a Bitmap, you can also extract // uncompressed/compressed image data directly using element.GetImageData() // as illustrated in ElementReaderAdv sample project. } break; } case ElementType.e_form: // Process form XObjects { reader.FormBegin(); result += await ImageExtract(reader); reader.End(); break; } } } return result; } } } ``` {% endcode %} {% endtab %} {% endtabs %} --- # Agent Instructions This documentation is published with GitBook. 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