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LEADTOOLS (Leadtools assembly)
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RasterUserMatchTable Class








Members 
Leadtools.ImageProcessing Namespace : RasterUserMatchTable Class
Maintains a predefined table to speed conversion with a user palette when using ColorResolutionCommand.
Object Model
Syntax
public class RasterUserMatchTable 
'Declaration
 

Public Class RasterUserMatchTable 
'Usage
 

Dim instance As RasterUserMatchTable
public sealed class RasterUserMatchTable 
function Leadtools.ImageProcessing.RasterUserMatchTable()
public ref class RasterUserMatchTable
Remarks

Use the RasterUserMatchTable class to create a predefined table to speed conversion with a user palette when using ColorResolutionCommand.

You should use the following sequence:

  1. Create a new instance of the RasterUserMatchTable class
  2. Call the RasterUserMatchTable.Create method to create the table.
  3. Call the RasterUserMatchTable.Use method to make this the current table. (Having this as a separate method allows you to save tables in files and get the one you need, without creating it again.)
  4. Run ColorResolutionCommand with ColorResolutionCommandPaletteFlags.UsePalette or ColorResolutionCommandPaletteFlags.FastMatch set in the ColorResolutionCommand.PaletteFlags property.
  5. Call the Unuse method when the table is no longer needed.

The completed table is a 32K array of integers. On a 32-bit system, it occupies 128K bytes of memory. Creation of the table is a slow, memory-intensive process that is useful only if you are using your own palette more than once. For example, you may want to create the table once, save it to a file, and ship that file with your application.

Example

This example changes the color resolution of a bitmap, using a user-defined palette and a match table for fast color matching.

Copy Code   
Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.ImageProcessing
Imports Leadtools.ImageProcessing.Core

      
  Public Sub RasterUserMatchTableExample()
   Dim codecs As RasterCodecs = New RasterCodecs()
   Dim srcFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp")
   Dim destFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "RasterUserMatchTable.bmp")

   ' Load the image from disk
   Dim image As RasterImage = codecs.Load(srcFileName)

   ' 64-color rainbow palette
   Dim colors As RasterColor() = {New RasterColor(0, 0, 0), New RasterColor(0, 0, 85), New RasterColor(0, 0, 170), _
                                  New RasterColor(0, 0, 255), New RasterColor(85, 0, 0), New RasterColor(85, 0, 85), _
                                  New RasterColor(85, 0, 170), New RasterColor(85, 0, 255), New RasterColor(170, 0, 0), _
                                  New RasterColor(170, 0, 85), New RasterColor(170, 0, 170), New RasterColor(170, 0, 255), _
                                  New RasterColor(255, 0, 0), New RasterColor(255, 0, 85), New RasterColor(255, 0, 170), _
                                  New RasterColor(255, 0, 255), New RasterColor(0, 85, 0), New RasterColor(0, 85, 85), _
                                  New RasterColor(0, 85, 170), New RasterColor(0, 85, 255), New RasterColor(85, 85, 0), _
                                  New RasterColor(85, 85, 85), New RasterColor(85, 85, 170), New RasterColor(85, 85, 255), _
                                  New RasterColor(170, 85, 0), New RasterColor(170, 85, 85), New RasterColor(170, 85, 170), _
                                  New RasterColor(170, 85, 255), New RasterColor(255, 85, 0), New RasterColor(255, 85, 85), _
                                  New RasterColor(255, 85, 170), New RasterColor(255, 85, 255), New RasterColor(0, 170, 0), _
                                  New RasterColor(0, 170, 85), New RasterColor(0, 170, 170), New RasterColor(0, 170, 255), _
                                  New RasterColor(85, 170, 0), New RasterColor(85, 170, 85), New RasterColor(85, 170, 170), _
                                  New RasterColor(85, 170, 255), New RasterColor(170, 170, 0), New RasterColor(170, 170, 85), _
                                  New RasterColor(170, 170, 170), New RasterColor(170, 170, 255), New RasterColor(255, 170, 0), _
                                  New RasterColor(255, 170, 85), New RasterColor(255, 170, 170), New RasterColor(255, 170, 255), _
                                  New RasterColor(0, 255, 0), New RasterColor(0, 255, 85), New RasterColor(0, 255, 170), _
                                  New RasterColor(0, 255, 255), New RasterColor(85, 255, 0), New RasterColor(85, 255, 85), _
                                  New RasterColor(85, 255, 170), New RasterColor(85, 255, 255), New RasterColor(170, 255, 0), _
                                  New RasterColor(170, 255, 85), New RasterColor(170, 255, 170), New RasterColor(170, 255, 255), _
                                  New RasterColor(255, 255, 0), New RasterColor(255, 255, 85), New RasterColor(255, 255, 170), _
                                  New RasterColor(255, 255, 255)}

   ' Create and set the user match table
   Dim userMatchTable As RasterUserMatchTable = New RasterUserMatchTable()
   userMatchTable.Create(colors)
   userMatchTable.Use()

   ' Change the color resolution using the new palette. Note that the user match table
   ' is makes your code faster only if you use it more than once. It is included here only 
   ' to show how it can be coded.

   Dim command As ColorResolutionCommand = New ColorResolutionCommand( _
                                           ColorResolutionCommandMode.InPlace, 8, RasterByteOrder.Rgb, _
                                           RasterDitheringMethod.FloydStein, _
                                           ColorResolutionCommandPaletteFlags.UsePalette Or _
                                           ColorResolutionCommandPaletteFlags.FastMatch, colors)
   command.Run(image)

   ' Free the user match table when it is no longer needed
   userMatchTable.Unuse()

   ' Save the image back to disk
   codecs.Save(image, destFileName, RasterImageFormat.Bmp, 8)

   ' Clean up
   image.Dispose()
End Sub

Public NotInheritable Class LEAD_VARS
Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
End Class
using Leadtools;
using Leadtools.Codecs;
using Leadtools.ImageProcessing;
using Leadtools.ImageProcessing.Core;

      
public void RasterUserMatchTableExample()
{
   RasterCodecs codecs = new RasterCodecs();
   string srcFileName = Path.Combine(ImagesPath.Path, "Image1.cmp");
   string destFileName = Path.Combine(ImagesPath.Path, "RasterUserMatchTable.bmp");

   // Load the image from disk
   RasterImage image = codecs.Load(srcFileName);

   // 64-color rainbow palette
   RasterColor[] colors = 
   {
      new RasterColor(0, 0, 0), new RasterColor(0, 0, 85), new RasterColor(0, 0, 170), new RasterColor(0, 0, 255),
      new RasterColor(85, 0, 0), new RasterColor(85, 0, 85), new RasterColor(85, 0, 170), new RasterColor(85, 0, 255),
      new RasterColor(170, 0, 0), new RasterColor(170, 0, 85), new RasterColor(170, 0, 170), new RasterColor(170, 0, 255),
      new RasterColor(255, 0, 0), new RasterColor(255, 0, 85), new RasterColor(255, 0, 170), new RasterColor(255, 0, 255),
      new RasterColor(0, 85, 0), new RasterColor(0, 85, 85), new RasterColor(0, 85, 170), new RasterColor(0, 85, 255),
      new RasterColor(85, 85, 0), new RasterColor(85, 85, 85), new RasterColor(85, 85, 170), new RasterColor(85, 85, 255),
      new RasterColor(170, 85, 0), new RasterColor(170, 85, 85), new RasterColor(170, 85, 170), new RasterColor(170, 85, 255),
      new RasterColor(255, 85, 0), new RasterColor(255, 85, 85), new RasterColor(255, 85, 170), new RasterColor(255, 85, 255),
      new RasterColor(0, 170, 0), new RasterColor(0, 170, 85), new RasterColor(0, 170, 170), new RasterColor(0, 170, 255),
      new RasterColor(85, 170, 0), new RasterColor(85, 170, 85), new RasterColor(85, 170, 170), new RasterColor(85, 170, 255),
      new RasterColor(170, 170, 0), new RasterColor(170, 170, 85), new RasterColor(170, 170, 170), new RasterColor(170, 170, 255),
      new RasterColor(255, 170, 0), new RasterColor(255, 170, 85), new RasterColor(255, 170, 170), new RasterColor(255, 170, 255),
      new RasterColor(0, 255, 0), new RasterColor(0, 255, 85), new RasterColor(0, 255, 170), new RasterColor(0, 255, 255),
      new RasterColor(85, 255, 0), new RasterColor(85, 255, 85), new RasterColor(85, 255, 170), new RasterColor(85, 255, 255),
      new RasterColor(170, 255, 0), new RasterColor(170, 255, 85), new RasterColor(170, 255, 170), new RasterColor(170, 255, 255),
      new RasterColor(255, 255, 0), new RasterColor(255, 255, 85), new RasterColor(255, 255, 170), new RasterColor(255, 255, 255)
   };

   // Create and set the user match table
   RasterUserMatchTable userMatchTable = new RasterUserMatchTable();
   userMatchTable.Create(colors);
   userMatchTable.Use();

   // Change the color resolution using the new palette. Note that the user match table
   // is makes your code faster only if you use it more than once. It is included here only 
   // to show how it can be coded.

   ColorResolutionCommand command = new ColorResolutionCommand(
      ColorResolutionCommandMode.InPlace,
      8,
      RasterByteOrder.Rgb,
      RasterDitheringMethod.FloydStein,
      ColorResolutionCommandPaletteFlags.UsePalette | ColorResolutionCommandPaletteFlags.FastMatch,
      colors);
   command.Run(image);

   // Free the user match table when it is no longer needed
   userMatchTable.Unuse();

   // Save the image back to disk
   codecs.Save(image, destFileName, RasterImageFormat.Bmp, 8);

   // Clean up
   image.Dispose();
   codecs.Dispose();
}
using Leadtools;
using Leadtools.Codecs;
using Leadtools.Examples;
using Leadtools.ImageProcessing;

public void RasterUserMatchTableExample(RasterImage image, Stream destStream)
{
   RasterCodecs codecs = new RasterCodecs();
   // 64-color rainbow palette
   RasterColor[] colors = 
   {
      new RasterColor(0, 0, 0), new RasterColor(0, 0, 85), new RasterColor(0, 0, 170), new RasterColor(0, 0, 255),
      new RasterColor(85, 0, 0), new RasterColor(85, 0, 85), new RasterColor(85, 0, 170), new RasterColor(85, 0, 255),
      new RasterColor(170, 0, 0), new RasterColor(170, 0, 85), new RasterColor(170, 0, 170), new RasterColor(170, 0, 255),
      new RasterColor(255, 0, 0), new RasterColor(255, 0, 85), new RasterColor(255, 0, 170), new RasterColor(255, 0, 255),
      new RasterColor(0, 85, 0), new RasterColor(0, 85, 85), new RasterColor(0, 85, 170), new RasterColor(0, 85, 255),
      new RasterColor(85, 85, 0), new RasterColor(85, 85, 85), new RasterColor(85, 85, 170), new RasterColor(85, 85, 255),
      new RasterColor(170, 85, 0), new RasterColor(170, 85, 85), new RasterColor(170, 85, 170), new RasterColor(170, 85, 255),
      new RasterColor(255, 85, 0), new RasterColor(255, 85, 85), new RasterColor(255, 85, 170), new RasterColor(255, 85, 255),
      new RasterColor(0, 170, 0), new RasterColor(0, 170, 85), new RasterColor(0, 170, 170), new RasterColor(0, 170, 255),
      new RasterColor(85, 170, 0), new RasterColor(85, 170, 85), new RasterColor(85, 170, 170), new RasterColor(85, 170, 255),
      new RasterColor(170, 170, 0), new RasterColor(170, 170, 85), new RasterColor(170, 170, 170), new RasterColor(170, 170, 255),
      new RasterColor(255, 170, 0), new RasterColor(255, 170, 85), new RasterColor(255, 170, 170), new RasterColor(255, 170, 255),
      new RasterColor(0, 255, 0), new RasterColor(0, 255, 85), new RasterColor(0, 255, 170), new RasterColor(0, 255, 255),
      new RasterColor(85, 255, 0), new RasterColor(85, 255, 85), new RasterColor(85, 255, 170), new RasterColor(85, 255, 255),
      new RasterColor(170, 255, 0), new RasterColor(170, 255, 85), new RasterColor(170, 255, 170), new RasterColor(170, 255, 255),
      new RasterColor(255, 255, 0), new RasterColor(255, 255, 85), new RasterColor(255, 255, 170), new RasterColor(255, 255, 255)
   };

   // Create and set the user match table
   RasterUserMatchTable userMatchTable = new RasterUserMatchTable();
   userMatchTable.Create(colors);
   userMatchTable.Use();

   // Change the color resolution using the new palette. Note that the user match table
   // is makes your code faster only if you use it more than once. It is included here only 
   // to show how it can be coded.

   ColorResolutionCommand command = new ColorResolutionCommand(
      ColorResolutionCommandMode.InPlace,
      8,
      RasterByteOrder.Rgb,
      RasterDitheringMethod.FloydStein,
      ColorResolutionCommandPaletteFlags.UsePalette | ColorResolutionCommandPaletteFlags.FastMatch,
      colors);
   command.Run(image);

   // Free the user match table when it is no longer needed
   userMatchTable.Unuse();

   // Save the image back to disk
   codecs.Save(image, destStream, RasterImageFormat.Bmp, 8);

   // Clean up
   image.Dispose();
}
Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.ImageProcessing

Public Sub RasterUserMatchTableExample(ByVal image As RasterImage, ByVal destStream As Stream)
   Dim codecs As RasterCodecs = New RasterCodecs()
   ' 64-color rainbow palette
   Dim colors As RasterColor() = {New RasterColor(0, 0, 0),
                                  New RasterColor(0, 0, 85),
                                  New RasterColor(0, 0, 170),
                                  New RasterColor(0, 0, 255),
                                  New RasterColor(85, 0, 0),
                                  New RasterColor(85, 0, 85),
                                  New RasterColor(85, 0, 170),
                                  New  _
         RasterColor(85, 0, 255), New RasterColor(170, 0, 0), New RasterColor(170, 0, 85), New RasterColor(170, 0, 170), New RasterColor(170, 0, 255), New RasterColor(255, 0, 0), New RasterColor(255, 0, 85), New RasterColor(255, 0, 170), New  _
         RasterColor(255, 0, 255), New RasterColor(0, 85, 0), New RasterColor(0, 85, 85), New RasterColor(0, 85, 170), New RasterColor(0, 85, 255), New RasterColor(85, 85, 0), New RasterColor(85, 85, 85), New RasterColor(85, 85, 170), New  _
         RasterColor(85, 85, 255), New RasterColor(170, 85, 0), New RasterColor(170, 85, 85), New RasterColor(170, 85, 170), New RasterColor(170, 85, 255), New RasterColor(255, 85, 0), New RasterColor(255, 85, 85), New RasterColor(255, 85, 170), _
         New RasterColor(255, 85, 255), New RasterColor(0, 170, 0), New RasterColor(0, 170, 85), New RasterColor(0, 170, 170), New RasterColor(0, 170, 255), New RasterColor(85, 170, 0), New RasterColor(85, 170, 85), New RasterColor(85, 170, 170), _
         New RasterColor(85, 170, 255), New RasterColor(170, 170, 0), New RasterColor(170, 170, 85), New RasterColor(170, 170, 170), New RasterColor(170, 170, 255), New RasterColor(255, 170, 0), New RasterColor(255, 170, 85), New RasterColor(255, _
         170, 170), New RasterColor(255, 170, 255), New RasterColor(0, 255, 0), New RasterColor(0, 255, 85), New RasterColor(0, 255, 170), New RasterColor(0, 255, 255), New RasterColor(85, 255, 0), New RasterColor(85, 255, 85), New  _
         RasterColor(85, 255, 170), New RasterColor(85, 255, 255), New RasterColor(170, 255, 0), New RasterColor(170, 255, 85), New RasterColor(170, 255, 170), New RasterColor(170, 255, 255), New RasterColor(255, 255, 0), New RasterColor(255, _
         255, 85), New RasterColor(255, 255, 170), New RasterColor(255, 255, 255)}

   ' Create and set the user match table
   Dim userMatchTable As RasterUserMatchTable = New RasterUserMatchTable()
   userMatchTable.Create(colors)
   userMatchTable.Use()

   ' Change the color resolution using the new palette. Note that the user match table
   ' is makes your code faster only if you use it more than once. It is included here only 
   ' to show how it can be coded.

   Dim command As ColorResolutionCommand = New ColorResolutionCommand(ColorResolutionCommandMode.InPlace, 8, RasterByteOrder.Rgb, RasterDitheringMethod.FloydStein, ColorResolutionCommandPaletteFlags.UsePalette Or _
         ColorResolutionCommandPaletteFlags.FastMatch, colors)
   command.Run(image)

   ' Free the user match table when it is no longer needed
   userMatchTable.Unuse()

   ' Save the image back to disk
   codecs.Save(image, destStream, RasterImageFormat.Bmp, 8)

   ' Clean up
   image.Dispose()
End Sub
Requirements

Target Platforms

See Also

Reference

RasterUserMatchTable Members
Leadtools.ImageProcessing Namespace

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