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Large Image examples

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

LargeImage1.java
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/*
    This file is part of the iText (R) project.
    Copyright (c) 1998-2020 iText Group NV
    Authors: iText Software.
 
    For more information, please contact iText Software at this address:
    sales@itextpdf.com
 */
package com.itextpdf.samples.sandbox.images;
 
import com.itextpdf.kernel.geom.PageSize;
import com.itextpdf.kernel.pdf.PdfDocument;
import com.itextpdf.kernel.pdf.PdfWriter;
import com.itextpdf.kernel.pdf.PdfReader;
import com.itextpdf.kernel.pdf.PdfDictionary;
import com.itextpdf.kernel.pdf.PdfName;
import com.itextpdf.kernel.pdf.PdfStream;
import com.itextpdf.kernel.pdf.xobject.PdfImageXObject;
import com.itextpdf.layout.Document;
import com.itextpdf.layout.element.Image;
 
import java.io.File;
 
public class LargeImage1 {
    public static final String DEST = "./target/sandbox/images/large_image1.pdf";
 
    public static final String SRC = "./src/test/resources/pdfs/large_image.pdf";
 
    public static void main(String[] args) throws Exception {
        File file = new File(DEST);
        file.getParentFile().mkdirs();
 
        new LargeImage1().manipulatePdf(DEST);
    }
 
    protected void manipulatePdf(String dest) throws Exception {
        PdfDocument resultDoc = new PdfDocument(new PdfWriter(dest));
        PdfDocument srcDoc = new PdfDocument(new PdfReader(SRC));
 
        // Assume that there is a single XObject in the source document
        // and this single object is an image.
        PdfDictionary pageDict = srcDoc.getFirstPage().getPdfObject();
        PdfDictionary pageResources = pageDict.getAsDictionary(PdfName.Resources);
        PdfDictionary pageXObjects = pageResources.getAsDictionary(PdfName.XObject);
        PdfName imgRef = pageXObjects.keySet().iterator().next();
        PdfStream imgStream = pageXObjects.getAsStream(imgRef);
        PdfImageXObject imgObject = new PdfImageXObject((PdfStream) imgStream.copyTo(resultDoc));
        Image image = new Image(imgObject);
        image.scaleToFit(14400, 14400);
        image.setFixedPosition(0, 0);
 
        srcDoc.close();
 
        PageSize pageSize = new PageSize(image.getImageScaledWidth(), image.getImageScaledHeight());
        Document doc = new Document(resultDoc, pageSize);
        doc.add(image);
 
        doc.close();
    }
}
LargeImage2.java
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/*
    This file is part of the iText (R) project.
    Copyright (c) 1998-2020 iText Group NV
    Authors: iText Software.
 
    For more information, please contact iText Software at this address:
    sales@itextpdf.com
 */
package com.itextpdf.samples.sandbox.images;
 
import com.itextpdf.kernel.geom.PageSize;
import com.itextpdf.kernel.pdf.PdfDictionary;
import com.itextpdf.kernel.pdf.PdfDocument;
import com.itextpdf.kernel.pdf.PdfName;
import com.itextpdf.kernel.pdf.PdfPage;
import com.itextpdf.kernel.pdf.PdfReader;
import com.itextpdf.kernel.pdf.PdfStream;
import com.itextpdf.kernel.pdf.PdfWriter;
import com.itextpdf.kernel.pdf.xobject.PdfImageXObject;
import com.itextpdf.layout.Canvas;
import com.itextpdf.layout.element.Image;
 
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
 
public class LargeImage2 {
    public static final String DEST = "./target/sandbox/images/large_image2.pdf";
 
    public static final String SRC = "./src/test/resources/pdfs/large_image.pdf";
 
    public static void main(String[] args) throws Exception {
        File file = new File(DEST);
        file.getParentFile().mkdirs();
 
        new LargeImage2().manipulatePdf(DEST);
    }
 
    protected void manipulatePdf(String dest) throws Exception {
        PdfDocument resultDoc = new PdfDocument(new PdfWriter(dest));
        ByteArrayOutputStream tempFile = new ByteArrayOutputStream();
 
        // The source pdf document's page size is expected to be huge: more than 14400 in width in height
        PdfDocument tempDoc = new PdfDocument(new PdfReader(SRC), new PdfWriter(tempFile));
 
        // Assume that there is a single XObject in the source document
        // and this single object is an image.
        PdfDictionary pageDict = tempDoc.getFirstPage().getPdfObject();
        PdfDictionary pageResources = pageDict.getAsDictionary(PdfName.Resources);
        PdfDictionary pageXObjects = pageResources.getAsDictionary(PdfName.XObject);
        PdfName imgRef = pageXObjects.keySet().iterator().next();
        PdfStream imgStream = pageXObjects.getAsStream(imgRef);
        PdfImageXObject imgObject = new PdfImageXObject(imgStream);
        Image img = new Image(imgObject);
        img.scaleToFit(14400, 14400);
        img.setFixedPosition(0, 0);
 
        tempDoc.addNewPage(1, new PageSize(img.getImageScaledWidth(), img.getImageScaledHeight()));
        PdfPage page = tempDoc.getFirstPage();
        new Canvas(page, page.getPageSize())
                .add(img)
                .close();
        tempDoc.close();
 
        PdfDocument docToCopy = new PdfDocument(new PdfReader(new ByteArrayInputStream(tempFile.toByteArray())));
        docToCopy.copyPagesTo(1, 1, resultDoc);
 
        docToCopy.close();
        resultDoc.close();
    }
}

Click the following link to see the legacy example for iText 5. Except for security fixes, iText 5 is no longer being developed.



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