SelectiveColorCommand Class

Changes the color of an image by altering the definitions of one or more colors used by the image. This class is available in the Raster Pro and above toolkits.

Object Model

Syntax

Visual Basic
C#
WinRT C#
WinRT JavaScript
C++

public class SelectiveColorCommand : Leadtools.ImageProcessing.RasterCommand, Leadtools.ImageProcessing.IRasterCommand

'Declaration
 
Public Class SelectiveColorCommand 
   Inherits Leadtools.ImageProcessing.RasterCommand
   Implements Leadtools.ImageProcessing.IRasterCommand

'Usage
 
Dim instance As SelectiveColorCommand

public sealed class SelectiveColorCommand : Leadtools.ImageProcessing.IRasterCommand

function Leadtools.ImageProcessing.Color.SelectiveColorCommand()

public ref class SelectiveColorCommand : public Leadtools.ImageProcessing.RasterCommand, Leadtools.ImageProcessing.IRasterCommand

Remarks

Selected colors are the additive colors (Red, Green and Blue), the subtractive colors (Cyan, Magenta and Yellow), the highlights (White), the midtones (Neutral) and the shadows (Black). Each of those"Selected Colors" has information about the percentages of cyan, magenta, yellow and black that constructs that selective color. Each unique pixel's color can be defined as using some certain percentage of CMYK values. By changing the percentage of CMYK values for a "selected color", all colors related to that "selected color" would change also. For example, you can decrease the Magenta percentage from the "Blue selected color" to change a blue color to a color that is more similar to Cyan. Also you can increase the Yellow percentage from the "Magenta selected color" to change magenta color to a color that is more similar to Red.
You control the percentage of CMYK for each of the selected colors using the members of a SelectiveColorCommandData class, which are, Cyan, Magenta, Yellow and Black. Each member takes a value from -100 to 100. Negative values for any of these members decrease the percentage of that color, whereas positive values increase the percentage of that color. If Cyan = -100 it means no cyan will be used, whereas if Cyan = 100 it means the full percentage of cyan will be used. If a value is out of range, a negative value goes to -100 and a positive value goes to 100.
Pixel colors are changed based on HSV color space. For example, if you alter the values for ColorsData[SelectiveCommandColorTypes.Red], then if a pixel value is within the RED range of the Hue scale, it is considered red and is changed using the settings in ColorsData[ColorSeparateCommandType.Red].
This command supports 48 and 64-bit color images. Support for 48 and 64-bit color images is available only in the Document/Medical toolkits.
This command does not support signed data images.
This command does not support 32-bit grayscale images.

For more information, refer to Correcting Colors.

Example

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

Public Sub SelectiveColorCommandExample()
   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 SelectiveColorCommand = New SelectiveColorCommand
   'Manipulate values.
   command.ColorsData(SelectiveCommandColorTypes.Red).Cyan = -100  ' Change the Red selected color
   command.ColorsData(SelectiveCommandColorTypes.Yellow).Cyan = 34    ' Change the Yellow selected color
   command.ColorsData(SelectiveCommandColorTypes.Yellow).Magenta = 100
   command.ColorsData(SelectiveCommandColorTypes.Yellow).Yellow = 40
   command.ColorsData(SelectiveCommandColorTypes.Green).Black = 100 ' Change the Green selected color
   command.ColorsData(SelectiveCommandColorTypes.Neutral).Cyan = -65  ' Change the Neutral selected color
   command.ColorsData(SelectiveCommandColorTypes.Neutral).Magenta = -39
   command.ColorsData(SelectiveCommandColorTypes.Neutral).Yellow = 63
   command.Run(leadImage)
   codecs.Save(leadImage, Path.Combine(LEAD_VARS.ImagesDir, "Result.jpg"), RasterImageFormat.Jpeg, 24)

End Sub

Public NotInheritable Class LEAD_VARS
   Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
End Class

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

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

      // Prepare the command
      SelectiveColorCommand command = new SelectiveColorCommand();
      //Manipulate values.
      command.ColorsData[(int)SelectiveCommandColorTypes.Red].Cyan  = -100; // Change the Red selected color
      command.ColorsData[(int)SelectiveCommandColorTypes.Yellow].Cyan  =  34;  // Change the Yellow selected color
      command.ColorsData[(int)SelectiveCommandColorTypes.Yellow].Magenta = 100;
      command.ColorsData[(int)SelectiveCommandColorTypes.Yellow].Yellow  =  40;
      command.ColorsData[(int)SelectiveCommandColorTypes.Green].Black = 100; // Change the Green selected color
      command.ColorsData[(int)SelectiveCommandColorTypes.Neutral].Cyan = -65;  // Change the Neutral selected color
      command.ColorsData[(int)SelectiveCommandColorTypes.Neutral].Magenta = -39;
      command.ColorsData[(int)SelectiveCommandColorTypes.Neutral].Yellow  =  63;
      command.Run(image);
      codecs.Save(image, Path.Combine(LEAD_VARS.ImagesDir, "Result.jpg"), RasterImageFormat.Jpeg, 24);

   }

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

[TestMethod]
public async Task SelectiveColorCommandExample()
{
   // 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
   SelectiveColorCommand command = new SelectiveColorCommand();
   //Manipulate values.
   command.ColorsData[(int)SelectiveCommandColorTypes.Red].Cyan  = -100; // Change the Red selected color
   command.ColorsData[(int)SelectiveCommandColorTypes.Yellow].Cyan  =  34;  // Change the Yellow selected color
   command.ColorsData[(int)SelectiveCommandColorTypes.Yellow].Magenta = 100;
   command.ColorsData[(int)SelectiveCommandColorTypes.Yellow].Yellow  =  40;
   command.ColorsData[(int)SelectiveCommandColorTypes.Green].Black = 100; // Change the Green selected color
   command.ColorsData[(int)SelectiveCommandColorTypes.Neutral].Cyan = -65;  // Change the Neutral selected color
   command.ColorsData[(int)SelectiveCommandColorTypes.Neutral].Magenta = -39;
   command.ColorsData[(int)SelectiveCommandColorTypes.Neutral].Yellow  =  63;
   command.Run(image);

   string destFileName = @"result.jpg";
   StorageFile saveFile = await Tools.AppLocalFolder.CreateFileAsync(destFileName);
   await codecs.SaveAsync(image, LeadStreamFactory.Create(saveFile), RasterImageFormat.Jpeg, 0);
}

public void SelectiveColorCommandExample(RasterImage image, Stream outStream)
{
   // Prepare the command
   SelectiveColorCommand command = new SelectiveColorCommand();
   //Manipulate values.
   command.ColorsData[(int)SelectiveCommandColorTypes.Red].Cyan  = -100; // Change the Red selected color
   command.ColorsData[(int)SelectiveCommandColorTypes.Yellow].Cyan  =  34;  // Change the Yellow selected color
   command.ColorsData[(int)SelectiveCommandColorTypes.Yellow].Magenta = 100;
   command.ColorsData[(int)SelectiveCommandColorTypes.Yellow].Yellow  =  40;
   command.ColorsData[(int)SelectiveCommandColorTypes.Green].Black = 100; // Change the Green selected color
   command.ColorsData[(int)SelectiveCommandColorTypes.Neutral].Cyan = -65;  // Change the Neutral selected color
   command.ColorsData[(int)SelectiveCommandColorTypes.Neutral].Magenta = -39;
   command.ColorsData[(int)SelectiveCommandColorTypes.Neutral].Yellow  =  63;
   command.Run(image);
   // Save result image
   RasterCodecs codecs = new RasterCodecs();
   codecs.Save(image, outStream, RasterImageFormat.Jpeg, 24);
   image.Dispose();
}

Public Sub SelectiveColorCommandExample(ByVal image As RasterImage, ByVal outStream As Stream)
   ' Prepare the command
   Dim command As SelectiveColorCommand = New SelectiveColorCommand()
   'Manipulate values.
   command.ColorsData(CInt(SelectiveCommandColorTypes.Red)).Cyan = -100 ' Change the Red selected color
   command.ColorsData(CInt(SelectiveCommandColorTypes.Yellow)).Cyan = 34 ' Change the Yellow selected color
   command.ColorsData(CInt(SelectiveCommandColorTypes.Yellow)).Magenta = 100
   command.ColorsData(CInt(SelectiveCommandColorTypes.Yellow)).Yellow = 40
   command.ColorsData(CInt(SelectiveCommandColorTypes.Green)).Black = 100 ' Change the Green selected color
   command.ColorsData(CInt(SelectiveCommandColorTypes.Neutral)).Cyan = -65 ' Change the Neutral selected color
   command.ColorsData(CInt(SelectiveCommandColorTypes.Neutral)).Magenta = -39
   command.ColorsData(CInt(SelectiveCommandColorTypes.Neutral)).Yellow = 63
   command.Run(image)
   ' Save result image
   Dim codecs As RasterCodecs = New RasterCodecs()
   codecs.Save(image, outStream, RasterImageFormat.Jpeg, 24)
   image.Dispose()
End Sub

Requirements

Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference