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PDFファイルを画像に変換

PDFドキュメントを画像に変換したかった。Ghost4jを使用していた。

問題: Ghost4Jは実行時にgsdll32.dllファイルを必要としますが、私はnot dllファイルを使用したいです。

質問1: ghost4jで、dllなしでイメージを変換する方法はありますか?

質問2: PDFBox APIで解決策を見つけました。 org.Apache.pdfbox.pdmodel.PDPagep have methodconvertToImage() `PDFページを画像形式に変換します。

PDDocument doc = PDDocument.load(new File("/document.pdf"));
List<PDPage>pages =  doc.getDocumentCatalog().getAllPages();
PDPage page = pages.get(0);
BufferedImage image =page.convertToImage();
File outputfile = new File("/image.png");
ImageIO.write(image, "png", outputfile);
doc.close();

PDFドキュメントにテキストのみがあります。このコードを実行すると、例外が発生します。

Aug 12, 2013 6:00:24 PM org.Apache.pdfbox.util.PDFStreamEngine processOperator
INFO: unsupported/disabled operation: BDC
Exception in thread "main" Java.lang.ExceptionInInitializerError
    at org.Apache.pdfbox.pdmodel.font.PDTrueTypeFont.getawtFont(PDTrueTypeFont.Java:481)
    at org.Apache.pdfbox.pdmodel.font.PDSimpleFont.drawString(PDSimpleFont.Java:109)
    at org.Apache.pdfbox.pdfviewer.PageDrawer.processTextPosition(PageDrawer.Java:235)
    at org.Apache.pdfbox.util.PDFStreamEngine.processEncodedText(PDFStreamEngine.Java:496)
    at org.Apache.pdfbox.util.operator.ShowTextGlyph.process(ShowTextGlyph.Java:62)
    at org.Apache.pdfbox.util.PDFStreamEngine.processOperator(PDFStreamEngine.Java:554)
    at org.Apache.pdfbox.util.PDFStreamEngine.processSubStream(PDFStreamEngine.Java:268)
    at org.Apache.pdfbox.util.PDFStreamEngine.processSubStream(PDFStreamEngine.Java:235)
    at org.Apache.pdfbox.util.PDFStreamEngine.processStream(PDFStreamEngine.Java:215)
    at org.Apache.pdfbox.pdfviewer.PageDrawer.drawPage(PageDrawer.Java:125)
    at org.Apache.pdfbox.pdmodel.PDPage.convertToImage(PDPage.Java:781)
    at org.Apache.pdfbox.pdmodel.PDPage.convertToImage(PDPage.Java:712)
    at ge.eid.esignature.adessa.pades.sign.PDFtoImage.main(PDFtoImage.Java:25)
Caused by: Java.lang.IllegalArgumentException
    at Java.nio.Buffer.position(Buffer.Java:216)
    at Sun.font.TrueTypeFont.lookupName(TrueTypeFont.Java:1153)
    at Sun.font.TrueTypeFont.getPostscriptName(TrueTypeFont.Java:1205)
    at Java.awt.Font.getPSName(Font.Java:1156)
    at org.Apache.pdfbox.pdmodel.font.FontManager.loadFonts(FontManager.Java:101)
    at org.Apache.pdfbox.pdmodel.font.FontManager.<clinit>(FontManager.Java:53)
    ... 13 more
18
grep

4-Request-Headers.pdf ファイルページを画像形式に簡単に変換できます。

すべてのpdfページをJavaを使用してPDF Box。

Apache PDFBox 1.8。*バージョンのソリューション:

Jarが必要 pdfbox-1.8.3.jar

またはMaven依存関係

<dependency>
    <groupId>org.Apache.pdfbox</groupId>
    <artifactId>pdfbox</artifactId>
    <version>1.8.3</version>
</dependency>

ここに解決策があります:

package com.pdf.pdfbox.examples;

import Java.awt.image.BufferedImage;
import Java.io.File;
import Java.util.List;

import javax.imageio.ImageIO;

import org.Apache.pdfbox.pdmodel.PDDocument;
import org.Apache.pdfbox.pdmodel.PDPage;

@SuppressWarnings("unchecked")
public class ConvertPDFPagesToImages {
    public static void main(String[] args) {
        try {
        String sourceDir = "C:/Documents/04-Request-Headers.pdf"; // Pdf files are read from this folder
        String destinationDir = "C:/Documents/Converted_PdfFiles_to_Image/"; // converted images from pdf document are saved here

        File sourceFile = new File(sourceDir);
        File destinationFile = new File(destinationDir);
        if (!destinationFile.exists()) {
            destinationFile.mkdir();
            System.out.println("Folder Created -> "+ destinationFile.getAbsolutePath());
        }
        if (sourceFile.exists()) {
            System.out.println("Images copied to Folder: "+ destinationFile.getName());             
            PDDocument document = PDDocument.load(sourceDir);
            List<PDPage> list = document.getDocumentCatalog().getAllPages();
            System.out.println("Total files to be converted -> "+ list.size());

            String fileName = sourceFile.getName().replace(".pdf", "");             
            int pageNumber = 1;
            for (PDPage page : list) {
                BufferedImage image = page.convertToImage();
                File outputfile = new File(destinationDir + fileName +"_"+ pageNumber +".png");
                System.out.println("Image Created -> "+ outputfile.getName());
                ImageIO.write(image, "png", outputfile);
                pageNumber++;
            }
            document.close();
            System.out.println("Converted Images are saved at -> "+ destinationFile.getAbsolutePath());
        } else {
            System.err.println(sourceFile.getName() +" File not exists");
        }

    } catch (Exception e) {
        e.printStackTrace();
    }
}
}

画像のjpg, jpeg, png, bmp, gif形式への可能な変換。

注:主に使用される画像形式について言及しました。

ImageIO.write(image , "jpg", new File( destinationDir +fileName+"_"+pageNumber+".jpg" ));
ImageIO.write(image , "jpeg", new File( destinationDir +fileName+"_"+pageNumber+".jpeg" ));
ImageIO.write(image , "png", new File( destinationDir +fileName+"_"+pageNumber+".png" ));
ImageIO.write(image , "bmp", new File( destinationDir +fileName+"_"+pageNumber+".bmp" ));
ImageIO.write(image , "gif", new File( destinationDir +fileName+"_"+pageNumber+".gif" ));

コンソール出力:

Images copied to Folder: Converted_PdfFiles_to_Image
Total files to be converted -> 13
Aug 06, 2014 1:35:49 PM org.Apache.pdfbox.util.PDFStreamEngine processOperator
INFO: unsupported/disabled operation: i
Image Created -> 04-Request-Headers_1.png
Aug 06, 2014 1:35:50 PM org.Apache.pdfbox.util.PDFStreamEngine processOperator
INFO: unsupported/disabled operation: i
Image Created -> 04-Request-Headers_2.png
Aug 06, 2014 1:35:51 PM org.Apache.pdfbox.util.PDFStreamEngine processOperator
INFO: unsupported/disabled operation: i
Image Created -> 04-Request-Headers_3.png
Aug 06, 2014 1:35:51 PM org.Apache.pdfbox.util.PDFStreamEngine processOperator
INFO: unsupported/disabled operation: i
Image Created -> 04-Request-Headers_4.png
Aug 06, 2014 1:35:52 PM org.Apache.pdfbox.util.PDFStreamEngine processOperator
INFO: unsupported/disabled operation: i
Image Created -> 04-Request-Headers_5.png
Aug 06, 2014 1:35:52 PM org.Apache.pdfbox.util.PDFStreamEngine processOperator
INFO: unsupported/disabled operation: i
Image Created -> 04-Request-Headers_6.png
Aug 06, 2014 1:35:53 PM org.Apache.pdfbox.util.PDFStreamEngine processOperator
INFO: unsupported/disabled operation: i
Image Created -> 04-Request-Headers_7.png
Aug 06, 2014 1:35:53 PM org.Apache.pdfbox.util.PDFStreamEngine processOperator
INFO: unsupported/disabled operation: i
Image Created -> 04-Request-Headers_8.png
Aug 06, 2014 1:35:54 PM org.Apache.pdfbox.util.PDFStreamEngine processOperator
INFO: unsupported/disabled operation: i
Image Created -> 04-Request-Headers_9.png
Aug 06, 2014 1:35:54 PM org.Apache.pdfbox.util.PDFStreamEngine processOperator
INFO: unsupported/disabled operation: i
Image Created -> 04-Request-Headers_10.png
Aug 06, 2014 1:35:54 PM org.Apache.pdfbox.util.PDFStreamEngine processOperator
INFO: unsupported/disabled operation: i
Image Created -> 04-Request-Headers_11.png
Aug 06, 2014 1:35:55 PM org.Apache.pdfbox.util.PDFStreamEngine processOperator
INFO: unsupported/disabled operation: i
Image Created -> 04-Request-Headers_12.png
Aug 06, 2014 1:35:55 PM org.Apache.pdfbox.util.PDFStreamEngine processOperator
INFO: unsupported/disabled operation: i
Image Created -> 04-Request-Headers_13.png
Converted Images are saved at -> C:\Documents\Converted_PdfFiles_to_Image

Apache PDFBox 2.0。*バージョンのソリューション:

必要なジャー pdfbox-2.0.16.jarfontbox-2.0.16.jarcommons-logging-1.2.jar

またはMaven依存関係から

<!-- https://mvnrepository.com/artifact/org.Apache.pdfbox/pdfbox -->
<dependency>
    <groupId>org.Apache.pdfbox</groupId>
    <artifactId>pdfbox</artifactId>
    <version>2.0.16</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.Apache.pdfbox/fontbox -->
<dependency>
    <groupId>org.Apache.pdfbox</groupId>
    <artifactId>fontbox</artifactId>
    <version>2.0.16</version>
</dependency>
<!-- https://mvnrepository.com/artifact/commons-logging/commons-logging -->
<dependency>
    <groupId>commons-logging</groupId>
    <artifactId>commons-logging</artifactId>
    <version>1.2</version>
</dependency>

2.0.16バージョンのソリューション:

package com.pdf.pdfbox.examples;

import Java.awt.image.BufferedImage;
import Java.io.File;

import javax.imageio.ImageIO;

import org.Apache.pdfbox.pdmodel.PDDocument;
import org.Apache.pdfbox.rendering.ImageType;
import org.Apache.pdfbox.rendering.PDFRenderer;

/**
 * 
 * @author venkataudaykiranp
 * 
 * @version 2.0.16(Apache PDFBox version support)
 *
 */
public class ConvertPDFPagesToImages {
    public static void main(String[] args) {
        try {
            String sourceDir = "C:\\Users\\venkataudaykiranp\\Downloads\\04-Request-Headers.pdf"; // Pdf files are read from this folder
            String destinationDir = "C:\\Users\\venkataudaykiranp\\Downloads\\Converted_PdfFiles_to_Image/"; // converted images from pdf document are saved here

            File sourceFile = new File(sourceDir);
            File destinationFile = new File(destinationDir);
            if (!destinationFile.exists()) {
                destinationFile.mkdir();
                System.out.println("Folder Created -> "+ destinationFile.getAbsolutePath());
            }
            if (sourceFile.exists()) {
                System.out.println("Images copied to Folder Location: "+ destinationFile.getAbsolutePath());             
                PDDocument document = PDDocument.load(sourceFile);
                PDFRenderer pdfRenderer = new PDFRenderer(document);

                int numberOfPages = document.getNumberOfPages();
                System.out.println("Total files to be converting -> "+ numberOfPages);

                String fileName = sourceFile.getName().replace(".pdf", "");             
                String fileExtension= "png";
                /*
                 * 600 dpi give good image clarity but size of each image is 2x times of 300 dpi.
                 * Ex:  1. For 300dpi 04-Request-Headers_2.png expected size is 797 KB
                 *      2. For 600dpi 04-Request-Headers_2.png expected size is 2.42 MB
                 */
                int dpi = 300;// use less dpi for to save more space in harddisk. For professional usage you can use more than 300dpi 

                for (int i = 0; i < numberOfPages; ++i) {
                    File outPutFile = new File(destinationDir + fileName +"_"+ (i+1) +"."+ fileExtension);
                    BufferedImage bImage = pdfRenderer.renderImageWithDPI(i, dpi, ImageType.RGB);
                    ImageIO.write(bImage, fileExtension, outPutFile);
                }

                document.close();
                System.out.println("Converted Images are saved at -> "+ destinationFile.getAbsolutePath());
            } else {
                System.err.println(sourceFile.getName() +" File not exists");
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
28
pudaykiran

NonSequentialParserを使用して、いくつかのPDFファイル(インクリメンタル更新あり)によるエラーを回避できます。

PDDocument doc = PDDocument.loadNonSeq(new File( "/ document.pdf"));

6
stanlyF

PDFBoxを経由する方法は、ネイティブバインディングを回避するための良い方法です。 PDFBoxからPDFImageWriterを使用してみてください。数行で同じことを行い、完全に機能しました。 PDFDocumentを抽出し、ライターを使用する必要があります。

PDFImageWriter.write(doc, "png", null, , Integer.MAX_VALUE, "picture");

すべてのページ。

PDFImageWriter.write(doc, "png", null, 0, 0, "picture");

参照: PDFImageWriter Javadoc

4
Xondio

おそらく、破損したPDFファイルを変換しようとしています。 PDFファイルにJPXEncodedストリームが含まれる場合も同じエラーが発生します。

3
Malhotra

PDFBoxを使用してPDFを画像に簡単に変換できます。renderImageWithDPIPDFRendererのクラスPDFBoxは、pdfを画像に変換するために使用されます。

PDDocument doc=PDDocument.load(new File("filepath/sample.pdf"));
PDFRenderer pdfRenderer = new PDFRenderer(doc);
BufferedImage bffim = pdfRenderer.renderImageWithDPI(pageNo, 300, ImageType.RGB);
        String fileName = "image-" + page + ".png";
        ImageIOUtil.writeImage(bim, fileName, 300);
1
Bittu Choudhary

エラーの場合:

org.Apache.pdfbox.util.PDFStreamEngine processOperator INFO:サポートされていない/無効な操作

Apache pdfbox jarとは別に、クラスパスにfontbox-1.7.1 jarを含める必要があります。これにより、PDFBoxが内部でfontbox-1.7.1を使用するため、問題が修正されます。

0
user2605874
 try {           
                PDDocument document = PDDocument.load(PdfInfo.getPDFWAY());
                if (document.isEncrypted()) {
                    document.decrypt(PdfInfo.getPASSWORD());
                }
                if ("bilevel".equalsIgnoreCase(PdfInfo.getCOLOR())) {
                    PdfInfo.setIMAGETYPE( BufferedImage.TYPE_BYTE_BINARY);
                } else if ("indexed".equalsIgnoreCase(PdfInfo.getCOLOR())) {
                    PdfInfo.setIMAGETYPE(BufferedImage.TYPE_BYTE_INDEXED);
                } else if ("gray".equalsIgnoreCase(PdfInfo.getCOLOR())) {
                    PdfInfo.setIMAGETYPE(BufferedImage.TYPE_BYTE_GRAY);
                } else if ("rgb".equalsIgnoreCase(PdfInfo.getCOLOR())) {
                    PdfInfo.setIMAGETYPE(BufferedImage.TYPE_INT_RGB);
                } else if ("rgba".equalsIgnoreCase(PdfInfo.getCOLOR())) {
                    PdfInfo.setIMAGETYPE(BufferedImage.TYPE_INT_ARGB);
                } else {
                    System.exit(2);
                }
                PDFImageWriter imageWriter = new PDFImageWriter();
                boolean success = imageWriter.writeImage(document, PdfInfo.getIMAGE_FORMAT(),PdfInfo.getPASSWORD(),
                        PdfInfo.getSTART_PAGE(),PdfInfo.getEND_PAGE(),PdfInfo.getOUTPUT_PREFIX(),PdfInfo.getIMAGETYPE(),PdfInfo.getRESOLUTION());
                if (!success) {
                    System.exit(1);
                }
                document.close();

        } catch (IOException | CryptographyException | InvalidPasswordException ex) {
            Logger.getLogger(PdfToImae.class.getName()).log(Level.SEVERE, null, ex);
        }
public class PdfInfo {
    private static String PDFWAY;    
    private static String OUTPUT_PREFIX;
    private static String PASSWORD;
    private static int START_PAGE=1;
    private static int END_PAGE=Integer.MAX_VALUE;
    private static String IMAGE_FORMAT="jpg";
    private static String COLOR="rgb";
    private static int RESOLUTION=256;
    private static int IMAGETYPE=24;
    private static String filename;
    private static String filePath="";
}
0
Vahap Gençdal