C# PDF Image Reader Library
How to read, extract images from existing PDF file using c# .net

In this tutorial, you learn how to read, extract images from a PDF file using C# without Acrobar installed.

How to read, extract PDF file images using C#

1. Download XDoc.PDF Image Reader C# library
2. Install PDF C# library to read, extract PDF images
3. Step by Step Tutorial

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• Best C#.NET library for extracting image from adobe PDF page in Visual Studio .NET framework project
• Provide trial SDK components for quick integration in Visual C#.NET WinForms and ASP.NET project for PDF image extraction
• Free C# source code for extracting image from specified PDF page position in .NET class
• Free PDF text how-tos for C#: remove text from pdf c#, pdf replace text c#, c# pdf insert image, c# add text to pdf, c# extract text from pdf, c# remove images from pdf.
• Support .NET Core, ASP.NET Core MVC, .NET WinForms, ASP.NET MVC in IIS, ASP.NET Ajax, Azure cloud service, DNN (DotNetNuke), SharePoint
• Extract various types of image from PDF file, like XObject Image, XObject Form, Inline Image, etc
• Get JPG, JPEG and other high quality image files from PDF document
• Able to extract vector images from PDF in .NET console application
• Extract all images from whole PDF or a specified PDF page
• Capture image from whole PDF based on special characteristics
• Scan image to PDF, tiff and various image formats
• Get image information, such as its location, zonal information, metadata, and so on

About class REImage

Using XDoc.PDF for .NET SDK, you can easily read, extract images from pdf document, page, page region. The extracted images are stored in PDFImage objects.

Class PDFImage includes the following properties and methods

1. Position: Position of the image in the page. Unit: pixel (in 96 dpi)
2. IsRotated: Indicate if the image is rotated.
3. Image: Get the embedded image resource related to this object.
4. IsInlineImage: Indicate if the resource is an Inline Image.
5. IsForm: Indicate if the resource is an XObject Form. Return false if the resource is an XObject Image or Inline Image.
6. IsXObjectForm: Same to IsForm
7. IsRGB: Indicate if the image is an XObject Image with ColorSpace DeviceRGB.
8. IsCMYK: Indicate if the image is an XObject Image with ColorSpace DeviceCMYK.
9. IsGray: Indicate if the image is an XObject Image with ColorSpace DeviceGray.
10. IsIndexed: Indicate if the image is an XObject Image with ColorSpace Indexed.
11. IsCIEBased: Indicate if the image is an XObject Image with CIE-based ColorSpace.



12. RectangleF GetBoundary(): Get boundary of the item in the Device Space (Windows-like coordinate system). Unit: pixel (in 96 dpi)
13. GetBitmap(): Get appearence of the page item in the Device Space (Windows-like coordinate system).
14. GetColorSpaceName(): Get Color Space type of the image. Only valid for PDFImageType.XObjImage.

Extract images from a pdf document using C#.NET

Using XDoc.PDF C# library, you can easily read, extract images from a pdf file, pdf pages, pdf page specified location or area.

C# extract images from whole pdf document

        #region extract images from whole pdf document
        internal static void extractImagesFromPdfFile()
        {
            String inputFilePath = @"C:\demo.pdf";
            // Open a document.
            PDFDocument doc = new PDFDocument(inputFilePath);

            // Extract all images in the document.
            List<PDFImage> allImages = PDFImageHandler.ExtractImages(doc);
        }
        #endregion

C# extract images from specified PDF page

        #region extract images from one pdf page
        internal static void extractImagesFromPdfPage()
        {
            String inputFilePath = @"C:\demo.pdf";
            // Open a document.
            PDFDocument doc = new PDFDocument(inputFilePath);
            PDFPage page = (PDFPage)doc.GetPage(0);

            // Extract all images on one pdf page.
            List<PDFImage> allImages = PDFImageHandler.ExtractImages(page);
        }
        #endregion

C# read the image from specified position (coordinates) inside pdf document

XDoc.PDF SDK is using Window Coordinate System.
Points on the screen are described by x- and y-coordinate pairs. The x-coordinates increase to the right; y-coordinates increase from top to bottom. The origin (0,0) is the most left top point on the pdf page.

        #region read the image from specified position (coordinates) inside pdf document
        internal static void extractImagesFromSpecifiedPosition()
        {
            String inputFilePath = @"C:\demo.pdf";
            // Open a document.
            PDFDocument doc = new PDFDocument(inputFilePath);

            // Get page 3 from the document.
            PDFPage page = (PDFPage)doc.GetPage(3);

            // Select image by the point (50F, 100F).
            PDFImage img = PDFImageHandler.SelectImage(page, new PointF(50F, 100F));

            // ...
        }
        #endregion

Read images list from specified area in pdf page

For api: public RectangleF(float x, float y, float width, float height)
(x,y) is the Rectangle left top corner coordicate, width, height are the rectangle's width and height.

//  open a document
String inputFilePath = Program.RootPath + "\\" + "3.pdf";
PDFDocument doc = new PDFDocument(inputFilePath);

//  get the first page
int pageIndex = 0;
PDFPage page = (PDFPage)doc.GetPage(pageIndex);

//  define the region (Rectangle [50F, 50F, 300F, 400F]) of the page
RectangleF region = new RectangleF(50F, 50F, 300F, 400F);

//  get all images in the region in sequence (from bottom to top)
List<PDFImage> images = PDFImageHandler.SelectImages(page, region);

//  select the top image in the region
PDFImage image1 = PDFImageHandler.SelectImage(page, region);

//  select the bottom image in the region
int sequenceIndex = 0;
PDFImage image2 = PDFImageHandler.SelectImage(page, region, sequenceIndex);

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