Extraction
Extract Image from PDFs - ImageExtract
Sample code for using Apryse SDK to extract images from PDF files, along with their positioning information and DPI; provided in Python, C++, C#, Java, Node.js (JavaScript), PHP, Ruby and VB. 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 code sample).
Learn more about our full PDF Data Extraction SDK Capabilities.
To start your free trial, get stated with Server SDK.
//
// Copyright (c) 2001-2024 by Apryse Software Inc. All Rights Reserved.
//
using System;
using System.Drawing;
using System.Drawing.Imaging;
using pdftron;
using pdftron.Common;
using pdftron.PDF;
using pdftron.SDF;
using pdftron.Filters;
namespace ImageExtractTestCS
{
class Class1
{
/// <summary>
///-----------------------------------------------------------------------------------
/// 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).
///-----------------------------------------------------------------------------------
/// </summary>
private static pdftron.PDFNetLoader pdfNetLoader = pdftron.PDFNetLoader.Instance();
static Class1() {}
static int image_counter = 0;
// Relative path to the folder containing test files.
static string input_path = "../../../../TestFiles/";
static string output_path = "../../../../TestFiles/Output/";
static void ImageExtract(PDFDoc doc, ElementReader reader)
{
Element element;
while ((element = reader.Next()) != null)
{
switch (element.GetType())
{
case Element.Type.e_image:
case Element.Type.e_inline_image:
{
Console.WriteLine("--> Image: {0}", ++image_counter);
Console.WriteLine(" Width: {0}", element.GetImageWidth());
Console.WriteLine(" Height: {0}", element.GetImageHeight());
Console.WriteLine(" BPC: {0}", element.GetBitsPerComponent());
Matrix2D ctm = element.GetCTM();
double x2=1, y2=1, y1=ctm.m_v;
ctm.Mult(ref x2, ref y2);
// Write the coords to 3 decimal places.
Console.WriteLine(" Coords: x1={0:N2}, y1={1:N2}, x2={2:N2}, y2={3:N2}", ctm.m_h, ctm.m_v, x2, y2);
pdftron.PDF.Image image = null;
if (element.GetType() == Element.Type.e_image)
{
image = new pdftron.PDF.Image(element.GetXObject());
string fname = output_path + "image_extract1_" + image_counter.ToString();
image.Export(fname); // or ExporAsPng() or ExporAsTiff() ...
}
break;
}
case Element.Type.e_form: // Process form XObjects
{
reader.FormBegin();
ImageExtract(doc, reader);
reader.End();
break;
}
}
}
}
static void Main(string[] args)
{
PDFNet.Initialize(PDFTronLicense.Key);
// 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
{
using (PDFDoc doc = new PDFDoc(input_path + "newsletter.pdf"))
using (ElementReader reader = new ElementReader())
{
doc.InitSecurityHandler();
PageIterator itr;
for (itr=doc.GetPageIterator(); itr.HasNext(); itr.Next())
{
reader.Begin(itr.Current());
ImageExtract(doc, reader);
reader.End();
}
Console.WriteLine("Done.");
}
}
catch (PDFNetException e)
{
Console.WriteLine(e.Message);
}
Console.WriteLine("----------------------------------------------------------------");
// Example 2:
// Extract images by scanning the low-level document.
try
{
using (PDFDoc doc = new PDFDoc(input_path + "newsletter.pdf"))
{
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);
Console.WriteLine("--> Image: {0}", ++image_counter);
Console.WriteLine(" Width: {0}", image.GetImageWidth());
Console.WriteLine(" Height: {0}", image.GetImageHeight());
Console.WriteLine(" BPC: {0}", image.GetBitsPerComponent());
string fname = output_path + "image_extract2_" + image_counter.ToString();
image.Export(fname); // or ExporAsPng() or ExporAsTiff() ...
// Convert PDF bitmap to GDI+ Bitmap...
//Bitmap bmp = image.GetBitmap();
//bmp.Save(fname, ImageFormat.Png);
//bmp.Dispose();
// 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.
}
}
Console.WriteLine("Done.");
}
}
catch (PDFNetException e)
{
Console.WriteLine(e.Message);
}
PDFNet.Terminate();
}
}
}