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將PDF文檔保存為tiff圖像
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人員輕松快捷高效地創建、編輯、轉換和打印 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。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，我們可以實現上述所有功能。本文將介紹如何將 XPS 轉為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。若想將文檔轉換為高質量的圖形，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。
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
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