將PDF文檔保存為tiff圖像

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Spire.PDF for .NET 是一款專門對 Word 文檔進行操作的 .NET 類庫。致力于在于幫助開發(fā)人員輕松快捷高效地創(chuàng)建、編輯、轉(zhuǎn)換和打印 Microsoft Word 文檔，而無需安裝 Microsoft Word。

行號用于在每行文本旁邊顯示 Word 自動計算的行數(shù)。當我們需要參考合同或法律文件等文檔中的特定行時，它非常有用。word中的行號功能允許我們設置起始值、編號間隔、與文本的距離以及行號的編號方式。使用 Spire.Doc，我們可以實現(xiàn)上述所有功能。本文將介紹如何將 XPS 轉(zhuǎn)為PDF 格式。

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Tiff圖像作為一種圖形容器，既可以存儲光柵圖像，也可以存儲矢量圖像；可以包含高質(zhì)量的圖形，支持從1位到24位的色深；支持有損和無損壓縮；還支持多層和多頁。若想將文檔轉(zhuǎn)換為高質(zhì)量的圖形，并且在壓縮過程中保存時不會丟失圖像文件信息，tiff圖像是您的最佳選擇。

本文介紹了通過document.SaveAsImage()和JoinTiffImages()方法將PDF文檔保存為tiff圖像的詳細方法。Spire.PDF for .NET是一個PDF組件，它包含了在.NET、Silverlight和WPF平臺上創(chuàng)建、閱讀、編輯和處理PDF文檔的豐富功能。下面的截圖展示了將PDF文檔保存為tiff圖像后的結果：

該方法的主要步驟如下
步驟1：創(chuàng)建一個新的pdf文檔并加載它。

1    PdfDocument document = new PdfDocument();
2    document.LoadFromFile(@"sample.pdf");

步驟2：使用document.SaveAsImage()方法將pdf文檔保存為圖像數(shù)組。

01   private static Image[] SaveAsImage(PdfDocument document)
02   {
03   Image[] images = new Image[document.Pages.Count];
04   for (int i = 0; i < document.Pages.Count; i++)
05   {
06   //use the document.SaveAsImage() method save the pdf as image
07   images[i] = document.SaveAsImage(i);
08   }
09   return images;
10   }

步驟3：使用JoinTiffImages()方法將pdf頁面中的圖像保存為tiff圖像類型，并指定編碼器和圖像編碼器參數(shù)。

01   public static void JoinTiffImages(Image[] images, string outFile, EncoderValue compressEncoder)
02   {
03   //use the save encoder
04   Encoder enc = Encoder.SaveFlag;
05   EncoderParameters ep = new EncoderParameters(2);
06   ep.Param[0] = new EncoderParameter(enc, (long)EncoderValue.MultiFrame);
07   ep.Param[1] = new EncoderParameter(Encoder.Compression, (long)compressEncoder);
08   Image pages = images[0];
09   int frame = 0;
10   ImageCodecInfo info = GetEncoderInfo("image/tiff");
11   foreach (Image img in images)
12   {
13   if (frame == 0)
14   {
15   pages = img;
16   //save the first frame
17   pages.Save(outFile, info, ep);
18   }
19   else
20   {
21   //save the intermediate frames
22   ep.Param[0] = new EncoderParameter(enc, (long)EncoderValue.FrameDimensionPage);
23   pages.SaveAdd(img, ep);
24   }
25   if (frame == images.Length - 1)
26   {
27   //flush and close.
28   ep.Param[0] = new EncoderParameter(enc, (long)EncoderValue.Flush);
29   pages.SaveAdd(ep);
30   }
31   frame++;
32   }
33   }

下載并安裝Spire.Pdf for .NET，使用下面的代碼體驗將pdf文檔保存為tiff圖片的方法。

完整代碼：

[C#]

01   using System;
02   using System.Drawing;
03   using System.Drawing.Imaging;
04   using Spire.Pdf;
05   namespace SavePdfAsTiff
06   {
07   class Program
08   {
09   static void Main(string[] args)
10   {
11   PdfDocument document = new PdfDocument();
12   document.LoadFromFile(@"01.pdf");
13   JoinTiffImages(SaveAsImage(document),"result.tiff",EncoderValue.CompressionLZW);
14   System.Diagnostics.Process.Start("result.tiff");
15   }
16   private static Image[] SaveAsImage(PdfDocument document)
17   {
18   Image[] images = new Image[document.Pages.Count];
19   for (int i = 0; i < document.Pages.Count; i++)
20   {
21   images[i] = document.SaveAsImage(i);
22   }
23   return images;
24   }
25	 
26   private static ImageCodecInfo GetEncoderInfo(string mimeType)
27   {
28   ImageCodecInfo[] encoders = ImageCodecInfo.GetImageEncoders();
29   for (int j = 0; j < encoders.Length; j++)
30   {
31   if (encoders[j].MimeType == mimeType)
32   return encoders[j];
33   }
34   throw new Exception(mimeType + " mime type not found in ImageCodecInfo");
35   }
36	 
37   public static void JoinTiffImages(Image[] images, string outFile, EncoderValue compressEncoder)
38   {
39   //use the save encoder
40   Encoder enc = Encoder.SaveFlag;
41   EncoderParameters ep = new EncoderParameters(2);
42   ep.Param[0] = new EncoderParameter(enc, (long)EncoderValue.MultiFrame);
43   ep.Param[1] = new EncoderParameter(Encoder.Compression, (long)compressEncoder);
44   Image pages = images[0];
45   int frame = 0;
46   ImageCodecInfo info = GetEncoderInfo("image/tiff");
47   foreach (Image img in images)
48   {
49   if (frame == 0)
50   {
51   pages = img;
52   //save the first frame
53   pages.Save(outFile, info, ep);
54   }
55	 
56   else
57   {
58   //save the intermediate frames
59   ep.Param[0] = new EncoderParameter(enc, (long)EncoderValue.FrameDimensionPage);
60	 
61   pages.SaveAdd(img, ep);
62   }
63   if (frame == images.Length - 1)
64   {
65   //flush and close.
66   ep.Param[0] = new EncoderParameter(enc, (long)EncoderValue.Flush);
67   pages.SaveAdd(ep);
68   }
69   frame++;
70   }
71   }
72   }
73   }

[VB.NET]

01   Imports System
02   Imports System.Drawing
03   Imports System.Drawing.Imaging
04   Imports Spire.Pdf
05   Namespace SavePdfAsTiff
06   Class Program
07   Sub Main()
08   Dim document As PdfDocument = New PdfDocument()
09   document.LoadFromFile("01.pdf")
10   JoinTiffImages(SaveAsImage(document), "result.tiff", EncoderValue.CompressionLZW)
11   System.Diagnostics.Process.Start("result.tiff")
12   End Sub
13   Private Shared Function SaveAsImage(ByVal document As PdfDocument)
14   Dim images() As Image = New Image(document.Pages.Count-1) {}
15   Dim i As Integer
16   For i = 0 To document.Pages.Count - 1 Step i + 1
17   images(i) = document.SaveAsImage(i)
18   Next
19   Return images
20   End Function
21   Private Shared Function GetEncoderInfo(ByVal mimeType As String) As ImageCodecInfo
22   Dim encoders() As ImageCodecInfo = ImageCodecInfo.GetImageEncoders()
23   Dim j As Integer
24   For j = 0 To encoders.Length - 1 Step j + 1
25   If encoders(j).MimeType = mimeType Then
26   Return encoders(j)
27   End If
28   Next
29   Throw New Exception(mimeType + " mime type not found in ImageCodecInfo")
30   End Function
31   Public Shared Sub JoinTiffImages(ByVal images() As Image, ByVal outFile As String, ByVal compressEncoder As EncoderValue)
32   use the save encoder
33   Dim enc As Encoder = Encoder.SaveFlag
34   Dim ep As EncoderParameters = New EncoderParameters(2)
35   ep.Param(0) = New EncoderParameter(enc, CType(EncoderValue.MultiFrame, Long))
36   ep.Param(1) = New EncoderParameter(Encoder.Compression, CType(compressEncoder, Long))
37   Dim pages As Image = images(0)
38   Dim frame As Integer = 0
39   Dim info As ImageCodecInfo = GetEncoderInfo("image/tiff")
40   Dim img As Image
41   For Each img In images
42   If frame = 0 Then
43   pages = img
44   'save the first frame
45   pages.Save(outFile, info, ep)
46   Else
47   'save the intermediate frames
48   ep.Param(0) = New EncoderParameter(enc, CType(EncoderValue.FrameDimensionPage, Long))
49   pages.SaveAdd(img, ep)
50   End If
51	 
52   If frame = images.Length - 1 Then
53   'flush and close.
54   ep.Param(0) = New EncoderParameter(enc, CType(EncoderValue.Flush, Long))
55   pages.SaveAdd(ep)
56   End If
57   frame = frame + 1
58   Next
59   End Sub
60   End Class
61   End Namespace