Emulation Tables

The LEAD Color Conversion toolkit provides emulation tables as one of its conversion methods. This method however is provided only for the following conversions:

CMYK to RGB.
CIELab to RGB.
RGB to CIELab.

The Emulation tables' method supports both built-in and custom options. For built-in emulation tables, use the ConversionMethodFlags.UseEmulationTables option. The custom emulation tables' option, ConversionMethodFlags.UseCustomEmulationTables, provides custom conversion using user-supplied images, converted from the source images distributed with the library, by any tool, as follows:

Conversion	Source	Convert to
CMYK to RGB	src_cmyk_image.tif	RGB image (i.e. dst_cmyk2rgb_image.tif)
RGB to Lab	src_rgb_image.tif	Lab image (i.e. dst_rgb2lab_image.tif)
Lab to RGB	src_lab_image.tif	RGB image (i.e. dst_lab2rgb_image.tif)

A set of images, already converted and ready for use (dst_cmyk2rgb_image.tif, dst_rgb2lab_image.tif, and dst_lab2rgb_image.tif), is provided. However, using the provided set of converted images will produce the same results as the built-in emulation tables.

The code below shows how a conversion can be done using the built-in tables:

Imports Leadtools  
Imports Leadtools.Codecs  
Imports Leadtools.ColorConversion 
              
Private Function BuiltInTablesConvertCmykToRgb(ByVal cmykBuffer As Byte(), ByVal width As Integer, ByVal height As Integer) As Byte() 
  ' StartUp the ColorConversion. 
  RasterColorConverter.Startup() 
                 
  ' Initialize the Rgb buffer array 
  Dim rgbBuffer As Byte() = New Byte(cmykBuffer.Length - 1){} 
                 
  ' Initialize a new ConversionParameters class object. 
  Dim convParams As ConversionParameters = New ConversionParameters() 
                 
  ' Conversion with options. 
  ' The conversion will be done with the options specified in the 
  ' convParams variable 
                 
  ' We want to use built-in emulation tables  
  convParams.Method = ConversionMethodFlags.UseEmulationTables 
              
  ' Set the quantization to 8 
  convParams.Quantization = 8 
                 
  ' set the active conversion method  
  convParams.ActiveMethod = ConversionMethodFlags.UseEmulationTables 
                 
  ' Initialize a new Converter object 
  Dim converter As RasterColorConverter = New RasterColorConverter() 
                 
  Try 
    ' Initialize the color conversion  
    converter.Start(ConversionColorFormat.Cmyk, ConversionColorFormat.Rgb, convParams) 
                 
    ' Convert the image buffer  
    converter.Convert(cmykBuffer, 0, rgbBuffer, 0, width, height, 0, 0) 
                 
    ' Stop the conversion  
    converter.Stop() 
  Catch ex As Exception 
    MessageBox.Show(ex.Message) 
    rgbBuffer = Nothing 
  End Try 
                 
  ' Shutdown the ColorConversion. 
  RasterColorConverter.Shutdown() 
                 
  ' return the converted buffer. 
  Return rgbBuffer 
End Function

using Leadtools;  
using Leadtools.Codecs;  
using Leadtools.ColorConversion; 
              
private byte[] BuiltInTablesConvertCmykToRgb(byte[] cmykBuffer, int width, int height) 
{ 
   // StartUp the ColorConversion. 
   RasterColorConverter.Startup(); 
              
   // Initialize the Rgb buffer array 
   byte[] rgbBuffer = new byte[cmykBuffer.Length]; 
              
   // Initialize a new ConversionParameters class object. 
   ConversionParameters convParams = new ConversionParameters(); 
              
   // Conversion with options. 
   // The conversion will be done with the options specified in the 
   // convParams variable 
              
   // We want to use built-in emulation tables  
   convParams.Method = ConversionMethodFlags.UseEmulationTables; 
              
   // set the active conversion method  
   convParams.ActiveMethod = ConversionMethodFlags.UseEmulationTables; 
              
   // set the quantization to 8 
   convParams.Quantization = 8; 
              
   // Initialize a new Converter object 
   RasterColorConverter converter = new RasterColorConverter(); 
              
   try 
   { 
      // Initialize the color conversion  
      converter.Start(ConversionColorFormat.Cmyk, 
          ConversionColorFormat.Rgb, 
          convParams); 
              
      // Convert the image buffer  
      converter.Convert(cmykBuffer, 0, rgbBuffer, 0, width, height, 0, 0); 
              
      // Stop the conversion  
      converter.Stop(); 
   } 
   catch (Exception ex) 
   { 
      MessageBox.Show(ex.Message); 
      rgbBuffer = null; 
   } 
              
   // Shutdown the ColorConversion. 
   RasterColorConverter.Shutdown(); 
              
   // return the converted buffer. 
   return rgbBuffer; 
}

The code below shows how a conversion can be done using user-defined tables:

Imports Leadtools  
Imports Leadtools.Codecs  
Imports Leadtools.ColorConversion 
              
Private Function UserTablesConvertCmykToRgb(ByVal cmykBuffer As Byte(), ByVal width As Integer, ByVal height As Integer) As Byte() 
   ' StartUp the ColorConversion. 
   RasterColorConverter.Startup() 
                  
   ' Initialize the Rgb buffer array 
   Dim rgbBuffer As Byte() = New Byte(cmykBuffer.Length - 1){} 
                  
   ' Initialize a new ConversionParameters class object. 
   Dim convParams As ConversionParameters = New ConversionParameters() 
                  
   ' Conversion with options. 
   ' The conversion will be done with the options specified in the  
   ' params(variable) 
                  
   ' we want to use custom emulation tables  
   convParams.Method = ConversionMethodFlags.UseCustomEmulationTables 
                  
   ' set the active conversion method  
   convParams.ActiveMethod = ConversionMethodFlags.UseCustomEmulationTables 
                  
   ' set the emulation tables  
   convParams.DestinationInputTable = "C:\Users\Public\Documents\LEADTOOLS Images\ET\src_rgb_image.tif" 
                  
   ' Initialize a new Converter object 
   Dim converter As RasterColorConverter = New RasterColorConverter() 
                  
   Try 
     ' Initialize the color conversion  
     converter.Start(ConversionColorFormat.Cmyk, ConversionColorFormat.Rgb, convParams) 
                  
     ' Convert the image buffer  
     converter.Convert(cmykBuffer, 0, rgbBuffer, 0, width, height, 0, 0) 
                  
     ' Stop the conversion  
     converter.Stop() 
   Catch ex As Exception 
     MessageBox.Show(ex.Message) 
     rgbBuffer = Nothing 
   End Try 
                  
   ' Shutdown the ColorConversion. 
   RasterColorConverter.Shutdown() 
                  
   ' return the converted buffer. 
   Return rgbBuffer 
End Function

using Leadtools;  
using Leadtools.Codecs;  
using Leadtools.ColorConversion; 
              
private byte[] UserTablesConvertCmykToRgb(byte[] cmykBuffer, int width, int height) 
{ 
   // StartUp the ColorConversion. 
   RasterColorConverter.Startup(); 
                
   // Initialize the Rgb buffer array 
   byte[] rgbBuffer = new byte[cmykBuffer.Length]; 
                
   // Initialize a new ConversionParameters class object. 
   ConversionParameters convParams = new ConversionParameters(); 
                
   // Conversion with options. 
   // The conversion will be done with the options specified in the  
   // params(variable) 
                
   // we want to use custom emulation tables  
   convParams.Method = ConversionMethodFlags.UseCustomEmulationTables; 
                
   // set the active conversion method  
   convParams.ActiveMethod = ConversionMethodFlags.UseCustomEmulationTables; 
                
   // set the emulation tables  
   convParams.DestinationInputTable = @"C:\Users\Public\Documents\LEADTOOLS Images\ET\src_rgb_image.tif"; 
                
   // Initialize a new Converter object 
   RasterColorConverter converter = new RasterColorConverter(); 
                
   try 
   { 
      // Initialize the color conversion  
      converter.Start(ConversionColorFormat.Cmyk, 
          ConversionColorFormat.Rgb, 
          convParams); 
                
      // Convert the image buffer  
      converter.Convert(cmykBuffer, 0, rgbBuffer, 0, width, height, 0, 0); 
                
      // Stop the conversion  
      converter.Stop(); 
   } 
   catch (Exception ex) 
   { 
      MessageBox.Show(ex.Message); 
      rgbBuffer = null; 
   } 
                
   // Shutdown the ColorConversion. 
   RasterColorConverter.Shutdown(); 
                
   // return the converted buffer. 
   return rgbBuffer; 
}

Help Version 19.0.2017.10.27

Products | Support | Contact Us | Copyright Notices
© 1991-2017 Apryse Sofware Corp. All Rights Reserved.

LEADTOOLS Imaging, Medical, and Document

Introduction

Getting Started

LEADTOOLS Software License Agreement

Files to be Included with your Application

Files to be Included with your Java Application