Large Image examples

Tags: imagesblank page problemiText 5

These examples were written in the context of the Help, I only see blank pages in my PDF tutorial.

Files: 
package sandbox.images;
 
import com.itextpdf.text.Document;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.Image;
import com.itextpdf.text.Rectangle;
import com.itextpdf.text.pdf.PRStream;
import com.itextpdf.text.pdf.PdfDictionary;
import com.itextpdf.text.pdf.PdfName;
import com.itextpdf.text.pdf.PdfReader;
import com.itextpdf.text.pdf.PdfWriter;
import com.itextpdf.text.pdf.parser.PdfImageObject;
 
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
 
import sandbox.WrapToTest;
 
@WrapToTest
public class LargeImage1 {
 
    public static final String SRC = "resources/pdfs/large_image.pdf";
    public static final String DEST = "results/images/large_image1.pdf";
 
    public static void main(String[] args) throws DocumentException, IOException {
        File file = new File(DEST);
        file.getParentFile().mkdirs();
        new LargeImage1().manipulatePdf(SRC, DEST);
    }
 
    public void manipulatePdf(String src, String dest) throws DocumentException, IOException {
        PdfReader reader = new PdfReader(src);
        // The width and the height of a PDF page may not exceed 14400 user units:
        Rectangle rect = reader.getPageSize(1);
        if (rect.getWidth() < 14400 && rect.getHeight() < 14400) {
            System.out.println("The size of the PDF document is within the accepted limits");
            System.exit(0);
        }
        // We assume that there's a single large picture on the first page
        PdfDictionary page = reader.getPageN(1);
        PdfDictionary resources = page.getAsDict(PdfName.RESOURCES);
        PdfDictionary xobjects = resources.getAsDict(PdfName.XOBJECT);
        PdfName imgRef = xobjects.getKeys().iterator().next();
        PRStream imgStream = (PRStream) xobjects.getAsStream(imgRef);
        // We now create a new Image object based on the bytes in the stream
        PdfImageObject imgObject = new PdfImageObject(imgStream);
        Image img = Image.getInstance(imgObject.getImageAsBytes());
        img.scaleToFit(14400, 14400);
        img.setAbsolutePosition(0, 0);
        reader.close();
        // We create a new document with the correct size
        Document document = new Document(new Rectangle(img.getScaledWidth(), img.getScaledHeight()));
        PdfWriter.getInstance(document, new FileOutputStream(dest));
        document.open();
        document.add(img);
        document.close();
    }
}
package sandbox.images;
 
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.Image;
import com.itextpdf.text.Rectangle;
import com.itextpdf.text.pdf.PRIndirectReference;
import com.itextpdf.text.pdf.PdfDictionary;
import com.itextpdf.text.pdf.PdfName;
import com.itextpdf.text.pdf.PdfReader;
import com.itextpdf.text.pdf.PdfStamper;
 
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
 
import sandbox.WrapToTest;
 
@WrapToTest
public class LargeImage2 {
 
    public static final String SRC = "resources/pdfs/large_image.pdf";
    public static final String DEST = "results/images/large_image2.pdf";
 
    public static void main(String[] args) throws DocumentException, IOException {
        File file = new File(DEST);
        file.getParentFile().mkdirs();
        new LargeImage2().manipulatePdf(SRC, DEST);
    }
 
    public void manipulatePdf(String src, String dest) throws DocumentException, IOException {
        PdfReader reader = new PdfReader(src);
        // The width and the height of a PDF page may not exceed 14400 user units:
        Rectangle rect = reader.getPageSize(1);
        if (rect.getWidth() < 14400 && rect.getHeight() < 14400) {
            System.out.println("The size of the PDF document is withing the accepted limits");
            System.exit(0);
        }
        // We assume that there's a single large picture on the first page
        PdfDictionary page = reader.getPageN(1);
        PdfDictionary resources = page.getAsDict(PdfName.RESOURCES);
        PdfDictionary xobjects = resources.getAsDict(PdfName.XOBJECT);
        PdfName imgName = xobjects.getKeys().iterator().next();
        Image img = Image.getInstance((PRIndirectReference)xobjects.getAsIndirectObject(imgName));
        img.scaleToFit(14400, 14400);
        img.setAbsolutePosition(0, 0);
        // We create a temporary file that will reuse the image
        File tmp = File.createTempFile("large_image", ".pdf", new File("results"));
        tmp.deleteOnExit();
        PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(tmp));
        // We create a new first page and add the image
        stamper.insertPage(1, new Rectangle(img.getScaledWidth(), img.getScaledHeight()));
        stamper.getOverContent(1).addImage(img);
        stamper.close();
        reader.close();
        // We create a new file that only contains the new first page
        reader = new PdfReader(tmp.getAbsolutePath());
        reader.selectPages("1");
        stamper = new PdfStamper(reader, new FileOutputStream(dest));
        stamper.close();
        reader.close();
    }
}
File nameRaw URLUpdated
LargeImage1.javaLargeImage1.java2015-10-09 11:53 am
LargeImage2.javaLargeImage2.java2015-10-09 11:53 am
Resources: 
File nameRaw URLUpdated
large_image.pdflarge_image.pdf2015-10-09 11:55 am
Results: 
File nameRaw URLUpdated
cmp_large_image1.pdfcmp_large_image1.pdf2015-10-09 11:54 am
cmp_large_image2.pdfcmp_large_image2.pdf2015-10-09 11:54 am