SetHuffmanDC Method

Summary

Sets DC Huffman tables.

Syntax

C++/CLI

Python

public void SetHuffmanDC( 
   TwainMemoryData[] huffmanDC 
)

public: 
void SetHuffmanDC(  
   array<TwainMemoryData>^ huffmanDC 
)

def SetHuffmanDC(self,] huffmanDC):

Parameters

huffmanDC
Array of Data value to be set in the specified DC Huffman table.

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

Download our FREE evaluation

Help Version 22.0.2023.3.31

Leadtools.Twain Assembly

Introduction

Getting Started

Namespaces

Leadtools.Twain Namespace

Assemblies