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DecodeImage Method

Summary

Decodes the specified PDF image object embedded in this PDFDocument.

Syntax

C#
VB
Java
C++
public RasterImage DecodeImage( 
   string imageObjectNumber 
) 
Public Function DecodeImage( _ 
   ByVal imageObjectNumber As String _ 
) As Leadtools.RasterImage 
public RasterImage decodeImage(String imageObjectNumber) 
public: 
Leadtools.RasterImage^ DecodeImage(  
   String^ imageObjectNumber 
)  

Parameters

imageObjectNumber
String that specifies the PDF image object number to decode.

Return Value

A Leadtools.RasterImage object.

Example

C#
VB
using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.Controls; 
using Leadtools.Pdf; 
using Leadtools.Svg; 
using Leadtools.WinForms; 
 
public void PDFDocumentDecodeImageExample() 
{ 
   string sourceFileName = Path.Combine(LEAD_VARS.ImagesDir, @"Leadtools.pdf"); 
   string destinationFileName = Path.Combine(LEAD_VARS.ImagesDir, @"LEAD_pdfDecodeImage.tif"); 
 
   using (PDFDocument document = new PDFDocument(sourceFileName)) 
   { 
      document.Resolution = 200; 
 
      // Parse the objects in all pages 
      document.ParsePages(PDFParsePagesOptions.Objects, 1, -1); 
 
      RasterCodecs codecs = new RasterCodecs(); 
      foreach (PDFDocumentPage page in document.Pages) 
         if (page.Objects != null && page.Objects.Count > 0) 
            foreach (PDFObject obj in page.Objects) 
               if (obj.ObjectType == PDFObjectType.Image) 
                  using (RasterImage image = document.DecodeImage(obj.ImageObjectNumber)) 
                     codecs.Save(image, destinationFileName, RasterImageFormat.TifLzw, image.BitsPerPixel, 1, 1, -1, CodecsSavePageMode.Append); 
 
      codecs.Dispose(); 
   } 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images"; 
} 
Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.Controls 
Imports Leadtools.Pdf 
Imports Leadtools.Svg 
Imports Leadtools.WinForms 
 
Public Sub PDFDocumentDecodeImageExample() 
   Dim sourceFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Leadtools.pdf") 
   Dim destinationFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "LEAD_pdfDecodeImage.tif") 
 
   Using document As PDFDocument = New PDFDocument(sourceFileName) 
      document.Resolution = 200 
 
      ' Parse the objects in all pages 
      document.ParsePages(PDFParsePagesOptions.Objects, 1, -1) 
 
      Dim codecs As RasterCodecs = New RasterCodecs() 
      For Each page As PDFDocumentPage In document.Pages 
         If Not page.Objects Is Nothing AndAlso page.Objects.Count > 0 Then 
            For Each obj As PDFObject In page.Objects 
               If obj.ObjectType = PDFObjectType.Image Then 
                  Using image As RasterImage = document.DecodeImage(obj.ImageObjectNumber) 
                     codecs.Save(image, destinationFileName, RasterImageFormat.TifLzw, image.BitsPerPixel, 1, 1, -1, CodecsSavePageMode.Append) 
                  End Using 
               End If 
            Next obj 
         End If 
      Next page 
 
      codecs.Dispose() 
   End Using 
End Sub 
 
Public NotInheritable Class LEAD_VARS 
   Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images" 
End Class 

Requirements

Target Platforms

Help Version 20.0.2018.1.18
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Leadtools.Pdf Assembly