问题描述

我有一个 pdf 文件(附件).我的目标是使用 pdfbox 原样将 pdf 转换为图像(与在 Windows 中使用截图工具相同).pdf有各种形状和文字.

i have a pdf file(attached). My objective is to convert a pdf to an image using pdfbox AS IT IS,(same as using snipping tool in windows). The pdf has all kinds of shapes and text .

我正在使用以下代码:

PDDocument doc = PDDocument.load("Hello World.pdf");
PDPage firstPage = (PDPage) doc.getDocumentCatalog().getAllPages().get(67);
BufferedImage bufferedImage = firstPage.convertToImage(imageType,screenResolution);
ImageIO.write(bufferedImage, "png",new File("out.png"));

当我使用代码时，图像文件给出完全错误的输出(附加了 out.png)

when i use the code, the image file gives totally wrong outputs(out.png attached)

如何让 pdfbox 拍摄类似直接快照图像的内容?

how do i make pdfbox take something like a direct snapshot image?

另外，我注意到png的图像质量不太好，有什么办法可以提高生成图像的分辨率?

also, i noticed that the image quality of the png is not so good, is there any way to increase the resolution of the generated image?

这是pdf(见第68页)https://drive.google.com/file/d/0B0ZiP71EQHz2NVZUcElvbFNreEU/编辑?usp=共享

here is the pdf(see page number 68) https://drive.google.com/file/d/0B0ZiP71EQHz2NVZUcElvbFNreEU/edit?usp=sharing

编辑 2:似乎所有的文字都消失了.我也尝试使用 PDFImageWriter 类

EDIT 2: it seems that all the text isvanishing. i also tried using the PDFImageWriter class

test.writeImage(doc, "png", null, 68, 69, "final.png",TYPE_USHORT_GRAY,200 );

同样的结果

推荐答案

事实证明 jpedal(lgpl) 完美地完成了转换(就像快照一样).

it turns out that jpedal(lgpl) does the converting perfectly(just like a snapshot).

这是我用过的:

PdfDecoder decode_pdf = new PdfDecoder(true);


FontMappings.setFontReplacements();

    decode_pdf.openPdfFile("Hello World.pdf"); 


 decode_pdf.setExtractionMode(0,800,3);

 try {

     for(int i=0;i<40;i++)
     {  
         BufferedImage img=decode_pdf.getPageAsImage(2+i);

    ImageIO.write(img, "png",new File(String.valueOf(i)+"out.png"));
     }
} catch (IOException ex) {
    Logger.getLogger(NewJFrame.class.getName()).log(Level.SEVERE, null, ex);
}

    decode_pdf.closePdfFile();

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

它工作正常.

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