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Sample Java code for using PDFTron 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 code sample). Learn more about our Java PDF Library and PDF Parsing & Content Extraction Library.
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//---------------------------------------------------------------------------------------
// Copyright (c) 2001-2023 by Apryse Software Inc. All Rights Reserved.
// Consult legal.txt regarding legal and license information.
//---------------------------------------------------------------------------------------
import com.pdftron.common.Matrix2D;
import com.pdftron.common.PDFNetException;
import com.pdftron.pdf.*;
import com.pdftron.sdf.DictIterator;
import com.pdftron.sdf.Obj;
import com.pdftron.sdf.SDFDoc;
///-----------------------------------------------------------------------------------
/// This sample illustrates one approach to PDF image extraction
/// using PDFNet.
///
/// Note: Besides direct image export, you can also convert PDF images
/// to Java image, or extract uncompressed/compressed image data directly
/// using element.GetImageData() (e.g. as illustrated in ElementReaderAdv
/// sample project).
///-----------------------------------------------------------------------------------
public class ImageExtractTest {
// Relative paths to folders containing test files.
static String input_path = "../../TestFiles/";
static String output_path = "../../TestFiles/Output/";
static int image_counter = 0;
static void ImageExtract(ElementReader reader) throws PDFNetException {
Element element;
while ((element = reader.next()) != null) {
switch (element.getType()) {
case Element.e_image:
case Element.e_inline_image: {
System.out.println("--> Image: " + (++image_counter));
System.out.println(" Width: " + element.getImageWidth());
System.out.println(" Height: " + element.getImageHeight());
System.out.println(" BPC: " + element.getBitsPerComponent());
Matrix2D ctm = element.getCTM();
double x2 = 1, y2 = 1;
java.awt.geom.Point2D.Double p = ctm.multPoint(x2, y2);
System.out.println(String.format(" Coords: x1=%.2f, y1=%.2f, x2=%.2f, y2=%.2f", ctm.getH(), ctm.getV(), p.getX(), p.getY()));
if (element.getType() == Element.e_image) {
Image image = new Image(element.getXObject());
String fname = "image_extract1_" + image_counter;
String path = output_path + fname;
image.export(path);
//String path2 = output_path + fname + ".tif";
//image.exportAsTiff(path2);
//String path3 = output_path + fname + ".png";
//image.exportAsPng(path3);
}
}
break;
case Element.e_form: // Process form XObjects
reader.formBegin();
ImageExtract(reader);
reader.end();
break;
}
}
}
public static void main(String[] args) {
// Initialize PDFNet
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 {
PDFDoc doc = new PDFDoc((input_path + "newsletter.pdf"));
doc.initSecurityHandler();
ElementReader reader = new ElementReader();
// Read every page
for (PageIterator itr = doc.getPageIterator(); itr.hasNext(); ) {
reader.begin(itr.next());
ImageExtract(reader);
reader.end();
}
doc.close();
System.out.println("Done.");
} catch (Exception e) {
e.printStackTrace();
}
System.out.println("----------------------------------------------------------------");
// Example 2:
// Extract images by scanning the low-level document.
try {
PDFDoc doc = new PDFDoc((input_path + "newsletter.pdf"));
doc.initSecurityHandler();
image_counter = 0;
SDFDoc cos_doc = doc.getSDFDoc();
long 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("Type");
if (!itr.hasNext() || !itr.value().getName().equals("XObject"))
continue;
itr = obj.find("Subtype");
if (!itr.hasNext() || !itr.value().getName().equals("Image"))
continue;
Image image = new Image(obj);
System.out.println("--> Image: " + (++image_counter));
System.out.println(" Width: " + image.getImageWidth());
System.out.println(" Height: " + image.getImageHeight());
System.out.println(" BPC: " + image.getBitsPerComponent());
String fname = "image_extract2_" + image_counter;
String path = output_path + fname;
image.export(path);
//String path= output_path + fname + ".tif";
//image.exportAsTiff(path);
//String path = output_path + fname + ".png";
//image.exportAsPng(path);
}
}
doc.close();
System.out.println("Done.");
} catch (Exception e) {
e.printStackTrace();
}
PDFNet.terminate();
}
}