SetJpegCompression Method

Summary

Sets the JPEG compression options for the current TWAIN session. This method lets the user set JPEG compression options for the current TWAIN session or reset the default JPEG compression options for the current TWAIN session, depending on the flag passed to the flag parameter.

Syntax

C++/CLI

Python

public void SetJpegCompression( 
   TwainJpegCompression compression, 
   bool resetValues 
)

public: 
void SetJpegCompression(  
   TwainJpegCompression compression, 
   bool resetValues 
)

def SetJpegCompression(self,compression,resetValues):

Parameters

compression
JPEG Compression data to be set

resetValues
Indicates the JPEG compression values to set

Remarks

Depending upon the flag used, this method will either set JPEG compression options for the current TWAIN session, or restore the default JPEG compression options for the current TWAIN session. For more information, refer to Using JPEG Compression For A TWAIN Source.

Example

using Leadtools; 
using Leadtools.Twain; 
 
 
public void SetJpegCompressionExample(IntPtr parent) 
{ 
   TwainSession session = new TwainSession(); 
   session.Startup(parent, "manufacturer", "productFamily", "version", "application", TwainStartupFlags.None); 
 
   try 
   { 
      TwainJpegCompression myJpeg = session.GetJpegCompression(false); 
      TwainMemoryData[] data = new TwainMemoryData[1]; 
 
      myJpeg.ColorScheme = TwainColorScheme.Gray; 
      myJpeg.SubSampling = 0x10001000; 
      myJpeg.ColorComponentCount = 1; 
      myJpeg.RestartFrequency = 0; 
 
      int[] quantMap = new int[1]; 
      quantMap[0] = 0; 
      myJpeg.SetQuantizationMap(quantMap); 
 
      int[] haffmanMap = new int[1]; 
      haffmanMap[0] = 0; 
      myJpeg.SetHuffmanMap(haffmanMap); 
      myJpeg.SetQuantizationTable(data); 
      myJpeg.SetHuffmanDC(data); 
      myJpeg.SetHuffmanAC(data); 
 
      session.SetJpegCompression(myJpeg, false); 
      MessageBox.Show("Set JPEG compression options is success"); 
   } 
   catch (Exception ex) 
   { 
      MessageBox.Show(ex.Message); 
   } 
 
   session.Shutdown(); 
}

Requirements

Target Platforms

Reference

TwainSession Class

TwainSession Members

GetJpegCompression Method

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Help Version 22.0.2023.3.31

Leadtools.Twain Assembly

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