如何将PDF文件转换为图像 [英] How to convert PDF files to images

问题描述

我需要将PDF文件转换为图像。如果PDF文件是多页，我只需要一张包含所有PDF页面的图像。

I need to convert PDF files to images. If the PDF file is multi-page，I just need one image that contains all of the PDF pages.

有开源解决方案吗？

推荐答案

线程 将PDF文件转换为JPEG图像 即可满足您的要求。

The thread "converting PDF file to a JPEG image" is suitable for your request.

一种解决方案是使用第三方库。 ImageMagick 非常受欢迎，也可以免费获得。您可以在此处为其获取.NET包装。 ImageMagick的原始下载页面是此处。

One solution is to use a third-party library. ImageMagick is a very popular and is freely available too. You can get a .NET wrapper for it here. The original ImageMagick download page is here.

• 将PDF页面转换为图像使用Solid Framework的文件 使用Solid Framework将PDF页面转换为图像文件（无效链接，已删除的文档位于 Internet存档） 。


• 将PDF转换为JPG 通用文档转换器


• 将PDF转换为JPG图像的6种方法

• Convert PDF pages to image files using the Solid Framework Convert PDF pages to image files using the Solid Framework (dead link, the deleted document is available on Internet Archive).
• Convert PDF to JPG Universal Document Converter
• 6 Ways to Convert a PDF to a JPG Image

，您还可以查看线程
如何从一个页面打开页面C＃ 中pictureBox中的pdf文件。

And you also can take a look at the thread "How to open a page from a pdf file in pictureBox in C#".

如果使用此过程进行了转换PDF到tiff ，您可以使用此类从 TIFF 检索位图。

If you use this process to convert a PDF to tiff, you can use this class to retrieve the bitmap from TIFF.

public class TiffImage
{
    private string myPath;
    private Guid myGuid;
    private FrameDimension myDimension;
    public ArrayList myImages = new ArrayList();
    private int myPageCount;
    private Bitmap myBMP;

    public TiffImage(string path)
    {
        MemoryStream ms;
        Image myImage;

        myPath = path;
        FileStream fs = new FileStream(myPath, FileMode.Open);
        myImage = Image.FromStream(fs);
        myGuid = myImage.FrameDimensionsList[0];
        myDimension = new FrameDimension(myGuid);
        myPageCount = myImage.GetFrameCount(myDimension);
        for (int i = 0; i < myPageCount; i++)
        {
            ms = new MemoryStream();
            myImage.SelectActiveFrame(myDimension, i);
            myImage.Save(ms, ImageFormat.Bmp);
            myBMP = new Bitmap(ms);
            myImages.Add(myBMP);
            ms.Close();
        }
        fs.Close();
    }
}

像这样使用它：

private void button1_Click(object sender, EventArgs e)
{
    TiffImage myTiff = new TiffImage("D:\\Some.tif");
    //imageBox is a PictureBox control, and the [] operators pass back
    //the Bitmap stored at that position in the myImages ArrayList in the TiffImage
    this.pictureBox1.Image = (Bitmap)myTiff.myImages[0];
    this.pictureBox2.Image = (Bitmap)myTiff.myImages[1];
    this.pictureBox3.Image = (Bitmap)myTiff.myImages[2];
}

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