SubSampling Property

Summary

Gets or sets a subsampling value. This property is updated by calling the GetJpegCompression method. To set the JPEG Compression options, set this property and the other TwainJpegCompression properties and call the SetJpegCompression method.

Syntax

C++/CLI

Python

public int SubSampling { get; set; }

public: 
property int SubSampling { 
   int get(); 
   void set (    int ); 
}

SubSampling # get and set (TwainJpegCompression)

Property Value

A subsampling value.

Remarks

For more information, refer to Using JPEG Compression For A TWAIN Source. For more information about TW_JPEGCOMPRESSION, refer to the TWAIN specification.

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

TwainJpegCompression Structure

TwainJpegCompression Members

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Help Version 22.0.2023.3.31

Leadtools.Twain Assembly

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Leadtools.Twain Namespace

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