Export PDF pages to a series of images in Java

I need to export the pages of an arbitrary PDF document into a series of individual images in jpeg/png/etc format. I need to do this in in Java.

Although I do know about iText, PDFBox and various other java pdf libraries, I am hoping for a pointer to some working example, or some how-to.

Thanks.

From stackoverflow

• Here is one way to do it, combining some code fragments from around the web.

  How do I draw a PDF into an Image?

  https://pdf-renderer.dev.java.net/examples.html

  Creating a Buffered Image from an Image

  http://www.exampledepot.com/egs/java.awt.image/Image2Buf.html

  Saving a Generated Graphic to a PNG or JPEG File

  http://www.exampledepot.com/egs/javax.imageio/Graphic2File.html

  Combined together into something that works like this to turn all the pages into images:

  import com.sun.pdfview.PDFFile;
  import com.sun.pdfview.PDFPage;
  import java.awt.Image;
  import java.awt.Rectangle;
  import java.io.*;
  import java.nio.ByteBuffer;
  import java.nio.channels.FileChannel;
  import javax.swing.*;
  import javax.imageio.*;
  import java.awt.image.*;
  
  public class ImageMain {
  
  public static void setup() throws IOException {
  
      //load a pdf from a byte buffer
      File file = new File("test.pdf");
      RandomAccessFile raf = new RandomAccessFile(file, "r");
      FileChannel channel = raf.getChannel();
      ByteBuffer buf = channel.map(FileChannel.MapMode.READ_ONLY, 0, channel.size());
      PDFFile pdffile = new PDFFile(buf);
  
      int numPgs = pdffile.getNumPages();
  
  
     for (int i=0; i<numPgs; i++)
     {
     // draw the first page to an image
      PDFPage page = pdffile.getPage(i);
  
      //get the width and height for the doc at the default zoom 
      Rectangle rect = new Rectangle(0,0,
              (int)page.getBBox().getWidth(),
              (int)page.getBBox().getHeight());
  
      //generate the image
      Image img = page.getImage(
              rect.width, rect.height, //width & height
              rect, // clip rect
              null, // null for the ImageObserver
              true, // fill background with white
              true  // block until drawing is done
              );
  
  
      //save it as a file
      BufferedImage bImg = toBufferedImage( img );
      File yourImageFile = new File("page_" + i + ".png");
      ImageIO.write( bImg,"png",yourImageFile);
      }
  }
  
  
  // This method returns a buffered image with the contents of an image
  public static BufferedImage toBufferedImage(Image image) {
      if (image instanceof BufferedImage) {
          return (BufferedImage)image;
      }
  
      // This code ensures that all the pixels in the image are loaded
      image = new ImageIcon(image).getImage();
  
      // Determine if the image has transparent pixels; for this method's
      // implementation, see e661 Determining If an Image Has Transparent Pixels
      boolean hasAlpha = hasAlpha(image);
  
      // Create a buffered image with a format that's compatible with the screen
      BufferedImage bimage = null;
      GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
      try {
          // Determine the type of transparency of the new buffered image
          int transparency = Transparency.OPAQUE;
          if (hasAlpha) {
              transparency = Transparency.BITMASK;
          }
  
          // Create the buffered image
          GraphicsDevice gs = ge.getDefaultScreenDevice();
          GraphicsConfiguration gc = gs.getDefaultConfiguration();
          bimage = gc.createCompatibleImage(
              image.getWidth(null), image.getHeight(null), transparency);
      } catch (HeadlessException e) {
          // The system does not have a screen
      }
  
      if (bimage == null) {
          // Create a buffered image using the default color model
          int type = BufferedImage.TYPE_INT_RGB;
          if (hasAlpha) {
              type = BufferedImage.TYPE_INT_ARGB;
          }
          bimage = new BufferedImage(image.getWidth(null), image.getHeight(null), type);
      }
  
      // Copy image to buffered image
      Graphics g = bimage.createGraphics();
  
      // Paint the image onto the buffered image
      g.drawImage(image, 0, 0, null);
      g.dispose();
  
      return bimage;
  }
  
  public static void main(final String[] args) {
      SwingUtilities.invokeLater(new Runnable() {
          public void run() {
              try {
                  ImageMain.setup();
              } catch (IOException ex) {
                  ex.printStackTrace();
              }
          }
      });
  }
  }
  

  dasp : This is exactly what I was looking for, thank you!

  zaletniy : the hasAlpha method missed can be found here http://www.biddata.net/joel/photo/final/Photo.java

• If you consider the JPedal PDF library, its built in and documented with eample source at http://support.idrsolutions.com/default.asp?W22

• Hi,

  I was looking for similar kind of solution for myself. When I tried the same example with a pdf file with more than 1 page, all output png files are coming for first page only. Any idea whats wrong here.

  Thanks, Abhi

• hi.

  jst start your for loop from 1 instead of 0...Your problem will be solved..

  cheers, Ravie