Question

我试图编写一个程序来从PDF文件中提取所有嵌入的图像。不幸的是，许多输入文件导致类似的例外：

com.itextpdf.text.exceptions.UnsupportedPdfException: The color space [blah blah blah] is not supported.

生成回溯的文件受密码保护，我无法取消保护或共享密码，我很害怕。但是，我遇到了来自多个来源的多个文件的错误。这些文件在OS X Preview和Acrobat Reader中都是完全可见和可打印的，所以我很确定问题出在iText而不是文件上。

我在OS X 10.10.3上使用iText 5.5.6和Oracle JDK 1.8.0_31但是在几个iText，JDK和OS版本上发生了同样的错误;我刚刚开始询问它。

代码（主循环只用这个类的实例调用PdfReaderContentParser.processContent）：

package info.metalfatigue;

import java.awt.image.BufferedImage;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;

import javax.imageio.ImageIO;

import com.itextpdf.text.pdf.PdfName;
import com.itextpdf.text.pdf.parser.ImageRenderInfo;
import com.itextpdf.text.pdf.parser.PdfImageObject;
import com.itextpdf.text.pdf.parser.RenderListener;
import com.itextpdf.text.pdf.parser.TextRenderInfo;

public class MyImageRenderListener implements RenderListener {
    private final String path;

    public MyImageRenderListener(final String path) {
        this.path = path;
    }

    @Override
    public void beginTextBlock() {
        // NOP
    }

    @Override
    public void renderText(
            @SuppressWarnings("unused") final TextRenderInfo renderInfo) {
        // NOP
    }

    @Override
    public void endTextBlock() {
        // NOP
    }

    @Override
    public void renderImage(final ImageRenderInfo renderInfo) {
        try {
            final PdfImageObject image = renderInfo.getImage();
            final PdfName filter = (PdfName)image.get(PdfName.FILTER);
            if (PdfName.DCTDECODE.equals(filter)) {
                @SuppressWarnings("boxing")
                final String filename =
                        String.format(
                                path,
                                renderInfo.getRef().getNumber(),
                                "jpg");
                final OutputStream os = new FileOutputStream(filename);
                os.write(image.getImageAsBytes());
                os.close();
            } else if (PdfName.JPXDECODE.equals(filter)) {
                @SuppressWarnings("boxing")
                final String filename =
                        String.format(
                                path,
                                renderInfo.getRef().getNumber(),
                                "jp2");
                final OutputStream os = new FileOutputStream(filename);
                os.write(image.getImageAsBytes());
                os.close();
            } else {
                final BufferedImage awtImage = image.getBufferedImage();
                if (null != awtImage) {
                    @SuppressWarnings("boxing")
                    final String filename =
                            String.format(
                                    path,
                                    renderInfo.getRef().getNumber(),
                                    "png");
                    final OutputStream os = new FileOutputStream(filename);
                    ImageIO.write(awtImage, "png", os);
                    os.close();
                }
            }
        } catch (final IOException e) {
            e.printStackTrace();
        }
    }
}

示例异常追溯：

com.itextpdf.text.exceptions.UnsupportedPdfException: The color space [/DeviceN, [/Black], /DeviceCMYK, 1153 0 R, 1152 0 R] is not supported.
    at com.itextpdf.text.pdf.parser.PdfImageObject.decodeImageBytes(PdfImageObject.java:323)
    at com.itextpdf.text.pdf.parser.PdfImageObject.<init>(PdfImageObject.java:200)
    at com.itextpdf.text.pdf.parser.PdfImageObject.<init>(PdfImageObject.java:169)
    at com.itextpdf.text.pdf.parser.ImageRenderInfo.prepareImageObject(ImageRenderInfo.java:124)
    at com.itextpdf.text.pdf.parser.ImageRenderInfo.getImage(ImageRenderInfo.java:114)
    at info.metalfatigue.MyImageRenderListener.renderImage(MyImageRenderListener.java:42)
    at com.itextpdf.text.pdf.parser.PdfContentStreamProcessor$ImageXObjectDoHandler.handleXObject(PdfContentStreamProcessor.java:1268)
    at com.itextpdf.text.pdf.parser.PdfContentStreamProcessor.displayXObject(PdfContentStreamProcessor.java:352)
    at com.itextpdf.text.pdf.parser.PdfContentStreamProcessor.access$6100(PdfContentStreamProcessor.java:60)
    at com.itextpdf.text.pdf.parser.PdfContentStreamProcessor$Do.invoke(PdfContentStreamProcessor.java:988)
    at com.itextpdf.text.pdf.parser.PdfContentStreamProcessor.invokeOperator(PdfContentStreamProcessor.java:286)
    at com.itextpdf.text.pdf.parser.PdfContentStreamProcessor.processContent(PdfContentStreamProcessor.java:429)
    at com.itextpdf.text.pdf.parser.PdfReaderContentParser.processContent(PdfReaderContentParser.java:80)
    at info.metalfatigue.PdfImgEx.main(PdfImgEx.java:23)

使用iText 5进行图像提取时出错：＆＃34;不支持色彩空间＆＃34;

0 个答案: