Pdf parser Image extraction from pdf

chandra shanker

I am using iTextsharp to extract images from the PDF file, i am able to extract images but the extracted images are not in correct format (i.e. it looks like negative proof).

7 Replies

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Hugo Ivan11y ago
I searched internet and found the following thread that might help:
http://stackoverflow.com/questions/5945244/extract-image-from-pdf-using-itextsharp

I am currently using leadtools to load PDF files as images, and save them to TIFF format.
Mote details can be found here:
http://support.leadtools.com/SupportPortal/CS/forums/22379/showpost.aspx
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Saroj Kumar Sahu11y ago
https://psycodedeveloper.wordpress.com/2013/01/10/how-to-extract-images-from-pdf-files-using-c-and-itextsharp/

http://www.vbforums.com/showthread.php?530736-2005-Extract-Images-from-a-PDF-file-using-iTextSharp
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Upendra Pratap Shahi11y ago
http://stackoverflow.com/questions/802269/extract-images-using-itextsharp

http://www.thevalvepage.com/swmonkey/2014/11/26/extract-images-from-pdf-files-using-itextsharp/
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yehudi li11y ago
Maybe you need try some third part PDF converter, I used pqScan PDF to Image control, it can extract image from PDF perfectly. If you want, you can have a try.
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arron lee13y ago
I am not using iTextsharp to extract images from the PDF file. I have only tried to edit PDF files using the freetrial package of another imaging document manager. But I have never met such a problem. You can change another tool to try it again. I hope you success. Good luck.

Best regards,
Arron
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chandra shanker13y ago

string sFilePath = "Test3.pdf"; int pageNum = 1;  PdfReader pdf = new PdfReader(sFilePath);  PdfDictionary pg = pdf.GetPageN(pageNum); PdfDictionary res = (PdfDictionary)PdfReader.GetPdfObject(pg.Get(PdfName.RESOURCES)); PdfDictionary xobj = (PdfDictionary)PdfReader.GetPdfObject(res.Get(PdfName.XOBJECT)); if (xobj == null) { return; } int imageCount = 0; foreach (PdfName name in xobj.Keys) {     PdfObject obj = xobj.Get(name);     if (!obj.IsIndirect()) { continue; }     PdfDictionary tg = (PdfDictionary)PdfReader.GetPdfObject(obj);     PdfName type = (PdfName)PdfReader.GetPdfObject(tg.Get(PdfName.SUBTYPE));     if (!type.Equals(PdfName.IMAGE)) { continue; }     int XrefIndex = Convert.ToInt32(((PRIndirectReference)obj).Number.ToString(System.Globalization.CultureInfo.InvariantCulture));     PdfObject pdfObj = pdf.GetPdfObject(XrefIndex);     PdfStream pdfStrem = (PdfStream)pdfObj;     byte[] bytes = PdfReader.GetStreamBytesRaw((PRStream)pdfStrem);     if (bytes == null) { continue; }     using (System.IO.MemoryStream memStream = new System.IO.MemoryStream(bytes))     {         try         {             memStream.Position = 0;             System.Drawing.Image img = System.Drawing.Image.FromStream(memStream);              if (!Directory.Exists(imgPath))                 Directory.CreateDirectory(imgPath);              string path = Path.Combine(imgPath, String.Format(@"{0}.jpg", ++imageCount));             System.Drawing.Imaging.EncoderParameters parms = new System.Drawing.Imaging.EncoderParameters(1);             parms.Param[0] = new System.Drawing.Imaging.EncoderParameter(System.Drawing.Imaging.Encoder.Compression, 0);             var jpegEncoder = ImageCodecInfo.GetImageEncoders().ToList().Find(x => x.FormatID == ImageFormat.Jpeg.Guid);             img.Save(path, jpegEncoder, parms);         }         catch (Exception ex)         {          }      } }

Ring Zhong13y ago
Hi,
any code you use? so that we could find the problem, thank you.
maybe you could evaluate another component, here is code for you to have a try,

using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;
using Spire.Pdf;

namespace ExtractImagesFromPDF
{
class Program
{
static void Main(string[] args)
{
//Instantiate an object of Spire.Pdf.PdfDocument
PdfDocument doc = new PdfDocument();
//Load a PDF file
doc.LoadFromFile("sample.pdf");
List ListImage = new List();
for (int i = 0; i < doc.Pages.Count; i++)
{
// Get an object of Spire.Pdf.PdfPageBase
PdfPageBase page = doc.Pages[i];
// Extract images from Spire.Pdf.PdfPageBase
Image[] images = page.ExtractImages();
if (images != null && images.Length > 0)
{
ListImage.AddRange(images);
}

}
if (ListImage.Count > 0)
{
for (int i = 0; i < ListImage.Count; i++)
{
Image image = ListImage[i];
image.Save("image" + (i + 1).ToString() + ".png", System.Drawing.Imaging.ImageFormat.Png);
}
System.Diagnostics.Process.Start("image1.png");
}

}
}
}
Source: How to Extract Image From PDF in C#?
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