CountLookupTableColors Method

C#
Visual Basic
WinRT C#
Objective-C
Java
WinRT JavaScript
C++

public static CountLookupTableColorsResult CountLookupTableColors( 
   RasterColor[] lookupTable,
   CountLookupTableColorsType type
)

'Declaration
 
Public Shared Function CountLookupTableColors( _
   ByVal lookupTable() As RasterColor, _
   ByVal type As CountLookupTableColorsType _
) As CountLookupTableColorsResult

'Usage
 
Dim lookupTable() As RasterColor
Dim type As CountLookupTableColorsType
Dim value As CountLookupTableColorsResult
 
value = CoreUtilities.CountLookupTableColors(lookupTable, type)

public static CountLookupTableColorsResult CountLookupTableColors( 
   RasterColor[] lookupTable,
   CountLookupTableColorsType type
)

+ (LTCountLookupTableColorsResult*)countLookupTableColors:(NSArray*)lookupTable 
type:(LTCountLookupTableColorsType)type 
rror:(NSError**)outError;

public static CountLookupTableColorsResult countLookupTableColors(
   RasterColor[] lookupTable, 
   CountLookupTableColorsType type
)

 function Leadtools.ImageProcessing.Core.CoreUtilities.CountLookupTableColors( 
   lookupTable ,
   type 
)

public:
static CountLookupTableColorsResult CountLookupTableColors( 
   array<RasterColor>^ lookupTable,
   CountLookupTableColorsType type
)

Parameters

lookupTable: 8-bit lookup table array to be filled by this method.
type: Flag that indicates whether the LookupTable contains signed or unsigned data.

Suppose you have a LookupTable with 4096 colors, the first 200 colors are black and the last 30 are white, the rest of the colors between black and white are gray. This is what the method will provide :

NumberOfEntries (property of CountLookupTableColorsResult) : 3868.

FirstIndex (property of CountLookupTableColorsResult) : 199.
In more detail this is:

Total number of entries: 4096 (0 - 4095).

First index of the end color: 4095 - 30 + 1 (+1 to add the first index of the end color to the range).

Number of occurrences of the starting color: 200 (0 - 199).

The last index of the start color: 199.

Total number of entries: (4095 - 30 + 1) - 199 + 1.
This method supports 12 and 16-bit grayscale images. Support for 12 and 16-bit grayscale images is available only in the Document/Medical toolkits.
This method uses 8-bit lookup tables. See CountLookupTableColorsExt for a method that uses 16-bit lookup tables.

C#
Visual Basic
WinRT C#
WinRT JavaScript
Silverlight C#
Silverlight VB

Copy Code

Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.ImageProcessing.Core

Public Sub CountLookupTableColorsExample()
   Dim codecs As New RasterCodecs()
   codecs.ThrowExceptionsOnInvalidImages = True

   Dim leadImage As RasterImage = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "Master.jpg"))

   ' Prepare the command
   Dim command As CountLookupTableColorsResult = CoreUtilities.CountLookupTableColors(leadImage.GetLookupTable, CountLookupTableColorsType.Signed)
   MessageBox.Show("First Index = " + command.FirstIndex.ToString + Chr(13) + "Number Of Entries = " + command.NumberOfEntries.ToString)

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.Core;

public void CountLookupTableColorsExample()
{
   // Load an image
   RasterCodecs codecs = new RasterCodecs();
   codecs.ThrowExceptionsOnInvalidImages = true;

   RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "Master.jpg"));

   // Prepare the command
   CountLookupTableColorsResult command = CoreUtilities.CountLookupTableColors(image.GetLookupTable(), CountLookupTableColorsType.Signed);
   MessageBox.Show("First Index = " + command.FirstIndex + "\n" +
      "Number Of Entries = " + command.NumberOfEntries);

}

static class LEAD_VARS
{
public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images";
}

//   
//   public async Task CountLookupTableColorsExample()
//   {
//      // Load an image
//      RasterCodecs codecs = new RasterCodecs();
//      codecs.ThrowExceptionsOnInvalidImages = true;

//      // Load the image
//      string srcFileName = @"Assets\Image1.cmp";
//      StorageFile loadFile = await Tools.AppInstallFolder.GetFileAsync(srcFileName);
//      RasterImage image = await codecs.LoadAsync(LeadStreamFactory.Create(loadFile));

//      // Prepare the command
//      CountLookupTableColorsResult command = CoreUtilities.CountLookupTableColors(image.GetLookupTable(), CountLookupTableColorsType.Signed);
//      Debug.WriteLine("First Index = " + command.FirstIndex + "\n" +
//         "Number Of Entries = " + command.NumberOfEntries);

//   }
//

using Leadtools;
using Leadtools.Codecs;
using Leadtools.ImageProcessing.Core;

      
public async Task CountLookupTableColorsExample()
{
   // Load an image
   RasterCodecs codecs = new RasterCodecs();
   codecs.ThrowExceptionsOnInvalidImages = true;
   // Load the image
   string srcFileName = @"Assets\Image1.cmp";
   StorageFile loadFile = await Tools.AppInstallFolder.GetFileAsync(srcFileName);
   RasterImage image = await codecs.LoadAsync(LeadStreamFactory.Create(loadFile));

   // Prepare the command
   CountLookupTableColorsResult command = CoreUtilities.CountLookupTableColors(image.GetLookupTable(), CountLookupTableColorsType.Signed);
   Debug.WriteLine("First Index = " + command.FirstIndex + "\n" +
      "Number Of Entries = " + command.NumberOfEntries);

}

using Leadtools;
using Leadtools.Examples;
using Leadtools.Codecs;
using Leadtools.ImageProcessing.Core;

public void CountLookupTableColorsExample(RasterImage image)
{
   // Prepare the command
   CountLookupTableColorsResult command = CoreUtilities.CountLookupTableColors(image.GetLookupTable(), CountLookupTableColorsType.Signed);
   Debug.WriteLine("First Index = " + command.FirstIndex + "\n" +
      "Number Of Entries = " + command.NumberOfEntries);
   image.Dispose();
}

Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.ImageProcessing.Core

Public Sub CountLookupTableColorsExample(ByVal image As RasterImage)
   ' Prepare the command
   Dim command As CountLookupTableColorsResult = CoreUtilities.CountLookupTableColors(image.GetLookupTable(), CountLookupTableColorsType.Signed)
   Debug.WriteLine("First Index = " & command.FirstIndex + Constants.vbLf & "Number Of Entries = " & command.NumberOfEntries)
   image.Dispose()
End Sub

Target Platforms

Reference

CoreUtilities Class
CoreUtilities Members
CountLookupTableColorsExt Method
Detecting Registration Marks
WindowLevelCommand Class
Leadtools.RasterPalette.WindowLevelFillLookupTable(Leadtools.RasterColor[],Leadtools.RasterColor,Leadtools.RasterColor,System.Int32,System.Int32,System.Int32,System.Int32,System.Int32,System.Int32,System.Int32,Leadtools.RasterPaletteWindowLevelFlags)
Leadtools.ImageProcessing.Effects.EffectsUtilities.GetUserLookupTable(System.Int32[],Leadtools.LeadPoint[])
Leadtools.ImageProcessing.Color.RemapIntensityCommand
ApplyLinearVoiLookupTableCommand Class