AddMagicWandToRegion Method

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

public void AddMagicWandToRegion( 
   int left,
   int top,
   RasterColor lowerToleranceColor,
   RasterColor upperToleranceColor,
   RasterRegionCombineMode combineMode
)

'Declaration
 
Public Sub AddMagicWandToRegion( _
   ByVal left As Integer, _
   ByVal top As Integer, _
   ByVal lowerToleranceColor As RasterColor, _
   ByVal upperToleranceColor As RasterColor, _
   ByVal combineMode As RasterRegionCombineMode _
)

'Usage
 
Dim instance As RasterImage
Dim left As Integer
Dim top As Integer
Dim lowerToleranceColor As RasterColor
Dim upperToleranceColor As RasterColor
Dim combineMode As RasterRegionCombineMode
 
instance.AddMagicWandToRegion(left, top, lowerToleranceColor, upperToleranceColor, combineMode)

public void AddMagicWandToRegion( 
   int left,
   int top,
   RasterColor lowerToleranceColor,
   RasterColor upperToleranceColor,
   RasterRegionCombineMode combineMode
)

 function Leadtools.RasterImage.AddMagicWandToRegion( 
   left ,
   top ,
   lowerToleranceColor ,
   upperToleranceColor ,
   combineMode 
)

public:
void AddMagicWandToRegion( 
   int left,
   int top,
   RasterColor lowerToleranceColor,
   RasterColor upperToleranceColor,
   RasterRegionCombineMode combineMode
)

Parameters

left: X coordinate of a point. The color of the specified point will be used to set the region.
top: Y coordinate of a point. The color of the specified point will be used to set the region.
lowerToleranceColor: Lower tolerance values that set the lower stopping point for the region.
upperToleranceColor: Upper tolerance values that set the upper stopping point for the region.
combineMode: The action to take regarding the existing image region, if one is defined.

For color bitmaps:

If the value of the pixel at (x, y) is (125, 125, 125) and lowerToleranceColor is (20,30,15), then the lower stopping point is (105, 95, 110). If upperToleranceColor is (20,30,15), then the upper stopping point is (145,155,140).

For gray scale bitmaps:

The minimum channel tolerance value of lowerToleranceColor will be used to set the lower stopping point, and the value of upperToleranceColor will be used to set the upper stopping point. For example, if the value of the pixel at (x, y) is (125, 125, 125) and lowerToleranceColor is (20,30,15), the smallest value of the triplet (15) will be used to create the lower stopping point of (110,110,110). If upperToleranceColor is (10,25,20), the smallest value of that triplet (10) will be used to create the upper stopping point of (135,135,135).

This function supports 12 and 16-bit grayscale and 48 and 64-bit color images. Support for 12 and 16-bit grayscale and 48 and 64-bit color images is available in Document/Medical Imaging.

To update an existing region, you specify how the new region is to be combined with the existing one using the combineMode parameter. For more information, refer to RasterRegionCombineMode.

For more information, refer to Creating a Region.

For more information, refer to Saving A Region.

For more information, refer to Working with the Existing Region.

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

Public Sub AddMagicWandToRegionExample()
      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, "Image1_AddMagicWandToRegion.bmp")

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

      ' Posterize the image to decrease the number of colors
      Dim posterize As PosterizeCommand = New PosterizeCommand(16)
      posterize.Run(image)

      ' Specify a pixel in the upper left of the displayed image
      Dim pt As LeadPoint = New LeadPoint(image.ImageWidth \ 8, image.ImageHeight \ 8)

      ' Adjust the point in case the view perspective is not TopLeft
      pt = image.PointToImage(RasterViewPerspective.TopLeft, pt)

      ' Create a magic wand region at this point
      Dim lowerColor As RasterColor = New RasterColor(20, 30, 150)
      Dim upperColor As RasterColor = New RasterColor(15, 30, 10)
      image.AddMagicWandToRegion(pt.X, pt.Y, lowerColor, upperColor, RasterRegionCombineMode.Set)

      ' Fill the region with blue
      Dim fill As FillCommand = New FillCommand(RasterColor.FromKnownColor(RasterKnownColor.Blue))
      fill.Run(image)

      ' Save the image
      codecs.Save(image, destFileName, RasterImageFormat.Bmp, 24)

      image.Dispose()
      codecs.Dispose()
   End Sub

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

public void AddMagicWandToRegionExample()
   {
      RasterCodecs codecs = new RasterCodecs();

      string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp");
      string destFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1_AddMagicWandToRegion.bmp");

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

      // Posterize the image to decrease the number of colors
      PosterizeCommand posterize = new PosterizeCommand(16);
      posterize.Run(image);

      // Specify a pixel in the upper left of the displayed image
      LeadPoint pt = new LeadPoint(image.ImageWidth / 8, image.ImageHeight / 8);

      // Adjust the point in case the view perspective is not TopLeft
      pt = image.PointToImage(RasterViewPerspective.TopLeft, pt);

      // Create a magic wand region at this point
      RasterColor lowerColor = new RasterColor(20, 30, 150);
      RasterColor upperColor = new RasterColor(15, 30, 10);
      image.AddMagicWandToRegion(pt.X, pt.Y, lowerColor, upperColor, RasterRegionCombineMode.Set);

      // Fill the region with blue
      FillCommand fill = new FillCommand(RasterColor.FromKnownColor(RasterKnownColor.Blue));
      fill.Run(image);

      // Save the image
      codecs.Save(image, destFileName, RasterImageFormat.Bmp, 24);

      image.Dispose();
      codecs.Dispose();
   }

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

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

RasterImage Class
RasterImage Members
Gray Scale Images
Introduction: Bits Per Pixel and Related Ideas
Using Color Values in LEADTOOLS