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Reusing images


repeatimage

JAVA

JAVA 
/*
    This file is part of the iText (R) project.
    Copyright (c) 1998-2023 Apryse Group NV
    Authors: Apryse Software.

    For more information, please contact iText Software at this address:
    sales@itextpdf.com
 */
/**
 * <p>
 * In this example, we take an image that is present in the background,
 * and we add the same image (by its reference) to the foreground so that
 * it covers the OCR'd text.
 */
package com.itextpdf.samples.sandbox.images;

import com.itextpdf.kernel.colors.ColorConstants;
import com.itextpdf.kernel.geom.Rectangle;
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.Document;
import com.itextpdf.layout.borders.SolidBorder;
import com.itextpdf.layout.element.Image;

import java.io.File;

public class RepeatImage {
    public static final String DEST = "./target/sandbox/images/repeat_image.pdf";

    public static final String SRC = "./src/main/resources/pdfs/chinese.pdf";

    public static void main(String[] args) throws Exception {
        File file = new File(DEST);
        file.getParentFile().mkdirs();

        new RepeatImage().manipulatePdf(DEST);
    }

    protected void manipulatePdf(String dest) throws Exception {
        PdfDocument pdfDoc = new PdfDocument(new PdfReader(SRC), new PdfWriter(dest));
        Document doc = new Document(pdfDoc);
        PdfPage firstPage = pdfDoc.getFirstPage();
        Rectangle pageSize = firstPage.getPageSize();

        // Assume that there is a single XObject in the source document
        // and this single object is an image.
        PdfDictionary pageDict = firstPage.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 image = new Image(imgObject);
        image.setFixedPosition(0, 0);
        image.setBorder(new SolidBorder(ColorConstants.BLACK, 5));
        image.scaleAbsolute(pageSize.getWidth(), pageSize.getHeight());
        doc.add(image);

        doc.close();
    }
}

C#

C# 
using System;
using System.IO;
using System.Linq;
using iText.Kernel.Colors;
using iText.Kernel.Geom;
using iText.Kernel.Pdf;
using iText.Kernel.Pdf.Xobject;
using iText.Layout;
using iText.Layout.Borders;
using iText.Layout.Element;

namespace iText.Samples.Sandbox.Images
{
    public class RepeatImage
    {
        public static readonly String DEST = "results/sandbox/images/repeat_image.pdf";

        public static readonly String SRC = "../../../resources/pdfs/chinese.pdf";

        public static void Main(String[] args)
        {
            FileInfo file = new FileInfo(DEST);
            file.Directory.Create();

            new RepeatImage().ManipulatePdf(DEST);
        }

        protected void ManipulatePdf(String dest)
        {
            PdfDocument pdfDoc = new PdfDocument(new PdfReader(SRC), new PdfWriter(dest));
            Document doc = new Document(pdfDoc);
            PdfPage firstPage = pdfDoc.GetFirstPage();
            Rectangle pageSize = firstPage.GetPageSize();

            // Assume that there is a single XObject in the source document
            // and this single object is an image.
            PdfDictionary pageDict = firstPage.GetPdfObject();
            PdfDictionary pageResources = pageDict.GetAsDictionary(PdfName.Resources);
            PdfDictionary pageXObjects = pageResources.GetAsDictionary(PdfName.XObject);
            PdfName imgRef = pageXObjects.KeySet().First();
            PdfStream imgStream = pageXObjects.GetAsStream(imgRef);
            PdfImageXObject imgObject = new PdfImageXObject(imgStream);
            Image image = new Image(imgObject);
            image.SetFixedPosition(0, 0);
            image.SetBorder(new SolidBorder(ColorConstants.BLACK, 5));
            image.ScaleAbsolute(pageSize.GetWidth(), pageSize.GetHeight());
            doc.Add(image);

            doc.Close();
        }
    }
}

reuseimage

JAVA

JAVA 
/*
    This file is part of the iText (R) project.
    Copyright (c) 1998-2023 Apryse Group NV
    Authors: Apryse 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.PdfReader;
import com.itextpdf.kernel.pdf.PdfStream;
import com.itextpdf.kernel.pdf.PdfWriter;
import com.itextpdf.kernel.pdf.xobject.PdfImageXObject;
import com.itextpdf.layout.Document;
import com.itextpdf.layout.element.Image;

import java.io.File;

public class ReuseImage {
    public static final String DEST = "./target/sandbox/images/reuse_image.pdf";

    public static final String SRC = "./src/main/resources/pdfs/single_image.pdf";

    public static void main(String[] args) throws Exception {
        File file = new File(DEST);
        file.getParentFile().mkdirs();

        new ReuseImage().manipulatePdf(DEST);
    }

    protected void manipulatePdf(String dest) throws Exception {
        PdfDocument srcDoc = new PdfDocument(new PdfReader(SRC));
        PdfDocument resultDoc = new PdfDocument(new PdfWriter(dest));
        Document doc = new Document(resultDoc, PageSize.A4.rotate());

        // 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));

        srcDoc.close();

        Image image = new Image(imgObject);
        image.scaleToFit(PageSize.A4.getHeight(), PageSize.A4.getWidth());
        image.setFixedPosition((PageSize.A4.getHeight() - image.getImageScaledWidth()) / 2,
                (595 - image.getImageScaledHeight()) / 2);
        doc.add(image);

        doc.close();
    }
}

C#

C# 
using System;
using System.IO;
using System.Linq;
using iText.Kernel.Geom;
using iText.Kernel.Pdf;
using iText.Kernel.Pdf.Xobject;
using iText.Layout;
using iText.Layout.Element;

namespace iText.Samples.Sandbox.Images
{
    public class ReuseImage
    {
        public static readonly String DEST = "results/sandbox/images/reuse_image.pdf";

        public static readonly String SRC = "../../../resources/pdfs/single_image.pdf";

        public static void Main(String[] args)
        {
            FileInfo file = new FileInfo(DEST);
            file.Directory.Create();

            new ReuseImage().ManipulatePdf(DEST);
        }

        protected void ManipulatePdf(String dest)
        {
            PdfDocument srcDoc = new PdfDocument(new PdfReader(SRC));
            PdfDocument resultDoc = new PdfDocument(new PdfWriter(dest));
            Document doc = new Document(resultDoc, PageSize.A4.Rotate());

            // 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().First();
            PdfStream imgStream = pageXObjects.GetAsStream(imgRef);
            PdfImageXObject imgObject = new PdfImageXObject((PdfStream) imgStream.CopyTo(resultDoc));
            
            srcDoc.Close();
            
            Image image = new Image(imgObject);
            image.ScaleToFit(PageSize.A4.GetHeight(), PageSize.A4.GetWidth());
            image.SetFixedPosition((PageSize.A4.GetHeight() - image.GetImageScaledWidth()) / 2,
                (PageSize.A4.GetWidth() - image.GetImageScaledHeight()) / 2);
            doc.Add(image);
            
            doc.Close();
        }
    }
}
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