Question

我希望获得相同的图像质量，就好像我会使用Adobe Acrobat中的export pdf to png一样。

但不知怎的，这对我不起作用。如果我在Adobe Acrobat工具的帮助下将pdf导出到png，我得到的尺寸是： 宽度：11264像素身高：15940像素

正如您所看到的，我为您提供了用于阅读pdf的方法，即每页创建一个图像。我有的可能性是使用.Render方法，它需要一个 int页面（索引）float dpiX，float dpiY，bool forPrinting

但有些如何对图像保存没有影响？

using (var document = PdfiumViewer.PdfDocument.Load(file)) 
{
    //This int is used to get the page count for each document 
    int pagecount = document.PageCount;

    //With the int pagecount we can create as may screenshots as there are pages in the document
    for (int index = 0; index < pagecount; index++)
    {
        //render the image created
        var image = document.Render(index,8448,11955, true);

        //savde the created screenshot temporerlay as a png + number (count)
        image.Save(@"C:\Users\chnikos\Desktop\Test\output" + index.ToString("000") + ".png",ImageFormat.Png);
        application.Selection.InlineShapes.AddPicture(@"C:\Users\chnikos\Desktop\Test\output" + index.ToString("000") + ".png");
    }
}

Answer 1

这可能是一个更好的例子： Library files

using System.Drawing.Imaging;

string Desktop = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);

//This one is with Spire.Pdf
void PDF_To_Image(string pdf)
{
   var doc = new Spire.Pdf.PdfDocument();
   doc.LoadFromFile(pdf);

   //This int is used to get the page count for each document 
   int pagecount = doc.Pages.Count;

   //With the int pagecount we can create as many screenshots as there are pages in the document
   for (int index = 0; index < pagecount; index++)
   {
      //render the image created
      var dpiX = 75;
      var dpiY = 75;
      var image = doc.SaveAsImage(index, Spire.Pdf.Graphics.PdfImageType.Bitmap, dpiX, dpiY);

      //save the created screenshot temporerlay as a png + number (count)
      image.Save(Desktop + @"\Test\output\" + index.ToString("000") + ".png", ImageFormat.Png);
   }
}

//This one is with Aspose.Pdf & xps2img.
//Aspose.Pdf converts the Pdf document to Xps format..
//xps2img creates images from the xps file..
void PDF_To_Image2(string pdf)
{
   var doc = new Aspose.Pdf.Document(pdf);
   var saveOptions = new Aspose.Pdf.XpsSaveOptions();
   doc.Save("Preview.xps", saveOptions);

   xps2img.Parameters pp = new xps2img.Parameters();
   pp.Dpi = 300;
   pp.ImageType = xps2img.ImageType.Png;
   pp.RequiredSize = new System.Drawing.Size((int)doc.PageInfo.Width, (int)doc.PageInfo.Height);
   pp.ImageOptions = xps2img.ImageOptions.Default;
   var img3 = xps2img.Xps2Image.ToBitmap("Preview.xps", pp).ToList();


   //This int is used to get the page count for each document 
   int pagecount = img3.Count;

   //With the int pagecount we can create as many screenshots as there are pages in the document
   for (int index = 0; index < pagecount; index++)
   {
      img3[index].Save(Desktop + @"\Test\Output\" + index.ToString("000") + ".png", ImageFormat.Png);
   }
}

Answer 2

使用PDFSharp＆amp; Migradocs

2016-05-01 10:20:00.000

Answer 3

try
{
    using (var document = PdfiumViewer.PdfDocument.Load(@"C:\Users\ohernandez\Pictures\img\descarga.pdf"))
    {
        for (int index = 0; index < document.PageCount; index++)
        {
            var image = document.Render(index, 300, 300, PdfRenderFlags.CorrectFromDpi);
            image.Save(@"C:\Users\ohernandez\Pictures\img\output.Jpeg" + index.ToString("000") + ".Jpeg", ImageFormat.Jpeg);
        }

    //    var image = document.Render(0, 300, 300, true);
     //   image.Save(@"C:\Users\ohernandez\Pictures\img\output.png", ImageFormat.Png);
    }
}
catch (Exception ex)
{
    // handle exception here;
}

获取PDF的原始大小

3 个答案: