package PDFtoImage;
import com.sun.pdfview.PDFFile;
import com.sun.pdfview.PDFPage;
import java.awt.Graphics;
import java.awt.GraphicsConfiguration;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.awt.HeadlessException;
import java.awt.Image;
import java.awt.Rectangle;
import java.awt.Transparency;
import java.io.*;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import javax.swing.*;
import javax.imageio.*;
import java.awt.image.*;
public class ImageErstellen {
static int wNew = 300;
static int hNew = 212;
public static void setup(File file) throws IOException {
//load a pdf from a byte buffer
//File file = new File("D:/test/1901x1962p01.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(20,20,
(int)page.getBBox().getWidth(),
(int)page.getBBox().getHeight());
//generate the image
Image img = page.getImage(
wNew, hNew, //width & height // Orginal -> rect.width, rect.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 );
System.out.println("File: " + file.getName().substring(0, file.getName().length()-4));
File yourImageFile = new File(file.getParent() + File.separator + file.getName().substring(0, file.getName().length()-4) + ".jpg");
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();
// 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;
// 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) {
System.out.println("The system does not have a screen");
}
if (bimage == null) {
int type = BufferedImage.TYPE_INT_RGB;
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;
}
}
