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Convert PDF to image (JPG, PNG, BMP, TIFF) in C# (UWP)

Sample C# (UWP) code to use PDFTron SDK's built-in rasterizer to render PDF images on the fly and save the resulting images in various raster image formats (such as PNG, JPEG, BMP, TIFF). Learn more about our PDF Conversion Library.

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using System;
using System.IO;
using System.Threading.Tasks;
using System.Runtime.InteropServices.WindowsRuntime;
using Windows.Foundation;
using Windows.Graphics.Imaging;
using Windows.Storage;
using Windows.Storage.Streams;

using pdftron.PDF;
using pdftron.SDF;

using PDFNetUniversalSamples.ViewModels;

namespace PDFNetSamples
{
    public sealed class PDFDrawTest : Sample
    {
        public PDFDrawTest() :
            base("PDFDraw", "This sample illustrates how to use the built-in rasterizer in order to render PDF images on the fly and how to save resulting images in PNG and JPEG format.")
        {
        }

        public override IAsyncAction RunAsync()
        {
            return Task.Run(new System.Action(async () => {
                WriteLine("--------------------------------");
                WriteLine("Starting PDFDraw Test...");
                WriteLine("--------------------------------\n");
                await this.Run().ConfigureAwait(false);
                WriteLine("\n--------------------------------");
                WriteLine("Done PDFDraw Test.");
                WriteLine("--------------------------------\n");
            })).AsAsyncAction();
        }

        async Task Run()
        {
            /*
            try
            {
                // Optional: Set ICC color profiles to fine tune color conversion 
                // for PDF 'device' color spaces. You can use your own ICC profiles. 
                // Standard Adobe color profiles can be download from Adobes site: 
                // http://www.adobe.com/support/downloads/iccprofiles/iccprofiles_win.html
                //
                // Simply drop all *.icc files in PDFNet resource folder or you specify 
                // the full pathname.
                //---
                // PDFNet.SetResourcesPath("../../../../../resources");
                // PDFNet.SetColorManagement();
                // PDFNet.SetDefaultDeviceCMYKProfile("USWebCoatedSWOP.icc"); // will search in PDFNet resource folder.
                // PDFNet.SetDefaultDeviceRGBProfile("AdobeRGB1998.icc"); 

                // Optional: Set predefined font mappings to override default font 
                // substitution for documents with missing fonts. For example:
                //---
                // PDFNet.AddFontSubst("StoneSans-Semibold", "C:/WINDOWS/Fonts/comic.ttf");
                // PDFNet.AddFontSubst("StoneSans", "comic.ttf");  // search for 'comic.ttf' in PDFNet resource folder.
                // PDFNet.AddFontSubst(PDFNet.CharacterOrdering.e_Identity, "C:/WINDOWS/Fonts/arialuni.ttf");
                // PDFNet.AddFontSubst(PDFNet.CharacterOrdering.e_Japan1, "C:/Program Files/Adobe/Acrobat 7.0/Resource/CIDFont/KozMinProVI-Regular.otf");
                // PDFNet.AddFontSubst(PDFNet.CharacterOrdering.e_Japan2, "c:/myfonts/KozMinProVI-Regular.otf");
                //
                // If fonts are in PDFNet resource folder, it is not necessary to specify 
                // the full path name. For example,
                //---
                // PDFNet.AddFontSubst(PDFNet.CharacterOrdering.e_Korea1, "AdobeMyungjoStd-Medium.otf");
                // PDFNet.AddFontSubst(PDFNet.CharacterOrdering.e_CNS1, "AdobeSongStd-Light.otf");
                // PDFNet.AddFontSubst(PDFNet.CharacterOrdering.e_GB1, "AdobeMingStd-Light.otf");
            }
            catch
            {
                WriteLine("The specified color profile was not found.");
            }
            */

            using (PDFDraw draw = new PDFDraw())
            {
                //--------------------------------------------------------------------------------
                // Example 1) Convert the first PDF page to PNG at 92 DPI. 
                // A three step tutorial to convert PDF page to an image.
                try
                {
                    // A) Open the PDF document.
                    using (PDFDoc doc = new PDFDoc(Path.Combine(InputPath, "tiger.pdf")))
                    {
                        // Initialize the security handler, in case the PDF is encrypted.
                        doc.InitSecurityHandler();

                        // B) The output resolution is set to 92 DPI.
                        draw.SetDPI(92);

                        // C) Rasterize the first page in the document and save the result as PNG.
                        pdftron.PDF.Page pg = doc.GetPage(1);
                        String output_file_path = Path.Combine(OutputPath, "tiger_92dpi.png");
                        draw.Export(pg, output_file_path);
                        WriteLine(String.Format("Example 1: Result saved in {0}", output_file_path));
                        await AddFileToOutputList(output_file_path).ConfigureAwait(false);

                        // Export the same page as TIFF
                        output_file_path = Path.Combine(OutputPath, "tiger_92dpi.tif");
                        draw.Export(pg, output_file_path, "TIFF");
                        await AddFileToOutputList(output_file_path).ConfigureAwait(false);
                    }
                }
                catch (Exception e)
                {
                    WriteLine(GetExceptionMessage(e));
                }

                //--------------------------------------------------------------------------------
                // Example 2) Convert the all pages in a given document to JPEG at 72 DPI.
                ObjSet hint_set = new ObjSet(); // A collection of rendering 'hits'.
                WriteLine("Example 2:");

                try
                {
                    using (PDFDoc doc = new PDFDoc(Path.Combine(InputPath, "newsletter.pdf")))
                    {
                        // Initialize the security handler, in case the PDF is encrypted.
                        doc.InitSecurityHandler();

                        draw.SetDPI(72); // Set the output resolution is to 72 DPI.

                        // Use optional encoder parameter to specify JPEG quality.
                        Obj encoder_param = hint_set.CreateDict();
                        encoder_param.PutNumber("Quality", 80);

                        // Traverse all pages in the document.
                        for (PageIterator itr = doc.GetPageIterator(); itr.HasNext(); itr.Next())
                        {
                            string output_file_path = string.Format(@"{0}\newsletter{1:d}.jpg", OutputPath, itr.GetPageNumber());
                            WriteLine(String.Format("\nResult saved in {0}", output_file_path));
                            draw.Export(itr.Current(), output_file_path, "JPEG", encoder_param);
                            await AddFileToOutputList(output_file_path).ConfigureAwait(false);
                        }
                    }
                }
                catch (Exception e)
                {
                    WriteLine(GetExceptionMessage(e));
                }

                try  // Examples 3-5
                {
                    // Common code for remaining samples.

                    using (PDFDoc tiger_doc = new PDFDoc(Path.Combine(InputPath, "tiger.pdf")))
                    {
                        // Initialize the security handler, in case the PDF is encrypted.
                        tiger_doc.InitSecurityHandler();
                        pdftron.PDF.Page page = tiger_doc.GetPage(1);

                        //--------------------------------------------------------------------------------
                        // Example 3) Convert the first page to WriteableBitmap. Also, rotate the 
                        // page 90 degrees and save the result as TIFF.
                        draw.SetDPI(100); // Set the output resolution is to 100 DPI.
                        draw.SetRotate(pdftron.PDF.PageRotate.e_90);  // Rotate all pages 90 degrees clockwise.

                        StorageFolder storageFolder = ApplicationData.Current.TemporaryFolder;
                        StorageFile outputFile = await storageFolder.CreateFileAsync("tiger_100dpi_rot90.tif", CreationCollisionOption.ReplaceExisting);

                        var bmpInfo = await draw.GetRawBitmapAsync(page).AsTask().ConfigureAwait(false);
                        byte[] pixels = bmpInfo.Buffer;
                        int height = bmpInfo.Height;
                        int width = bmpInfo.Width;

                        int offset;

                        for (int row = 0; row < height; row++)
                        {
                            for (int col = 0; col < width; col++)
                            {
                                offset = (row * width * 4) + (col * 4);
                                byte B = pixels[offset];
                                byte G = pixels[offset + 1];
                                byte R = pixels[offset + 2];
                                byte A = pixels[offset + 3];

                                // convert to RGBA format for BitmapEncoder
                                pixels[offset] = R; // Red
                                pixels[offset + 1] = G; // Green
                                pixels[offset + 2] = B; // Blue
                                pixels[offset + 3] = A; // Alpha
                            }
                        }
                        IRandomAccessStream writeStream = await outputFile.OpenAsync(FileAccessMode.ReadWrite);
                        BitmapEncoder encoder = await BitmapEncoder.CreateAsync(BitmapEncoder.TiffEncoderId, writeStream);
                        encoder.SetPixelData(BitmapPixelFormat.Rgba8, BitmapAlphaMode.Premultiplied, (uint)width, (uint) height, 96, 96, pixels);
                        await encoder.FlushAsync().AsTask().ConfigureAwait(false);
                        await writeStream.GetOutputStreamAt(0).FlushAsync().AsTask().ConfigureAwait(false);

                        //bmp.Save(output_path + "tiger_100dpi_rot90.tif", System.Drawing.Imaging.ImageFormat.Tiff);
                        //Message += String.Format("\nExample 3: Result saved in {0}", output_path + "tiger_100dpi_rot90.tif");
                        draw.SetRotate(pdftron.PDF.PageRotate.e_0);  // Disable image rotation for remaining samples.

                        //--------------------------------------------------------------------------------
                        // Example 4) Convert PDF page to a fixed image size. Also illustrates some 
                        // other features in PDFDraw class such as rotation, image stretching, exporting 
                        // to grayscale, or monochrome.

                        // Initialize render 'gray_hint' parameter, that is used to control the 
                        // rendering process. In this case we tell the rasterizer to export the image as 
                        // 1 Bit Per Component (BPC) image.
                        Obj mono_hint = hint_set.CreateDict();
                        mono_hint.PutNumber("BPC", 1);

                        // SetImageSize can be used instead of SetDPI() to adjust page  scaling 
                        // dynamically so that given image fits into a buffer of given dimensions.
                        String output_file_path = Path.Combine(OutputPath, "tiger_1000x1000.png");
                        draw.SetImageSize(1000, 1000);		// Set the output image to be 1000 wide and 1000 pixels tall
                        draw.Export(page, output_file_path, "PNG", mono_hint);
                        await AddFileToOutputList(output_file_path).ConfigureAwait(false);
                        WriteLine(String.Format("\nExample 4: Result saved in {0}", output_file_path));

                        draw.SetImageSize(200, 400);	    // Set the output image to be 200 wide and 300 pixels tall
                        draw.SetRotate(pdftron.PDF.PageRotate.e_180);  // Rotate all pages 90 degrees clockwise.

                        // 'gray_hint' tells the rasterizer to export the image as grayscale.
                        Obj gray_hint = hint_set.CreateDict();
                        gray_hint.PutName("ColorSpace", "Gray");

                        output_file_path = Path.Combine(OutputPath, "tiger_200x400_rot180.png");
                        draw.Export(page, output_file_path, "PNG", gray_hint);
                        WriteLine(String.Format("\nExample 4: Result saved in {0}", output_file_path));
                        await AddFileToOutputList(output_file_path).ConfigureAwait(false);

                        draw.SetImageSize(400, 200, false, true);  // The third parameter sets 'preserve-aspect-ratio' to false.
                        draw.SetRotate(pdftron.PDF.PageRotate.e_0);    // Disable image rotation.
                        output_file_path = Path.Combine(OutputPath, "tiger_400x200_stretch.jpg");
                        draw.Export(page, output_file_path, "JPEG");
                        WriteLine(String.Format("\nExample 4: Result saved in {0}", output_file_path));
                        await AddFileToOutputList(output_file_path).ConfigureAwait(false);

                        //--------------------------------------------------------------------------------
                        // Example 5) Zoom into a specific region of the page and rasterize the 
                        // area at 200 DPI and as a thumbnail (i.e. a 50x50 pixel image).
                        page.SetCropBox(new pdftron.PDF.Rect(216, 522, 330, 600));	// Set the page crop box.

                        // Select the crop region to be used for drawing.
                        draw.SetPageBox(pdftron.PDF.PageBox.e_crop);
                        draw.SetDPI(900);  // Set the output image resolution to 900 DPI.
                        output_file_path = Path.Combine(OutputPath, "tiger_zoom_900dpi.png");
                        draw.Export(page, output_file_path, "PNG");
                        WriteLine(String.Format("\nExample 5: Result saved in {0}", output_file_path));
                        await AddFileToOutputList(output_file_path).ConfigureAwait(false);

                        draw.SetImageSize(50, 50);	   // Set the thumbnail to be 50x50 pixel image.
                        output_file_path = Path.Combine(OutputPath, "tiger_zoom_50x50.png");
                        draw.Export(page, output_file_path, "PNG");
                        WriteLine(String.Format("\nExample 6: Result saved in {0}", output_file_path));
                        await AddFileToOutputList(output_file_path).ConfigureAwait(false);
                    }
                }
                catch (Exception e)
                {
                    WriteLine(GetExceptionMessage(e));
                }

                Obj cmyk_hint = hint_set.CreateDict();
                cmyk_hint.PutName("ColorSpace", "CMYK");

                //--------------------------------------------------------------------------------
                // Example 7) Convert the first PDF page to CMYK TIFF at 92 DPI. 
                // A three step tutorial to convert PDF page to an image.
                try
                {
                    // A) Open the PDF document.
                    using (PDFDoc doc = new PDFDoc(Path.Combine(InputPath, "tiger.pdf")))
                    {
                        // Initialize the security handler, in case the PDF is encrypted.
                        doc.InitSecurityHandler();

                        // B) The output resolution is set to 92 DPI.
                        draw.SetDPI(92);

                        // C) Rasterize the first page in the document and save the result as TIFF.
                        String output_file_path = Path.Combine(OutputPath, "out1.tif");
                        pdftron.PDF.Page pg = doc.GetPage(1);
                        draw.Export(pg, output_file_path, "TIFF", cmyk_hint);
                        WriteLine(String.Format("\nExample 7: Result saved in {0}", output_file_path));
                        await AddFileToOutputList(output_file_path).ConfigureAwait(false);
                    }
                }
                catch (Exception e)
                {
                    WriteLine(GetExceptionMessage(e));
                }
                // using PDFDraw
            }
        }
    }
}
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