Leadtools Send comments on this topic. | Back to Introduction - All Topics | Help Version 16.5.9.25
AddMagicWandToRegion Method
See Also  Example
Leadtools Namespace > RasterImage Class : AddMagicWandToRegion Method



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.
Sets a region based on the color found at point x, y in the image.

Syntax

Visual Basic (Declaration)  
Public Sub AddMagicWandToRegion( _
   ByVal left As Integer, _
   ByVal top As Integer, _
   ByVal lowerToleranceColor As RasterColor, _
   ByVal upperToleranceColor As RasterColor, _
   ByVal combineMode As RasterRegionCombineMode _
) 
Visual Basic (Usage) Copy Code
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)
C#  
public void AddMagicWandToRegion( 
   int left,
   int top,
   RasterColor lowerToleranceColor,
   RasterColor upperToleranceColor,
   RasterRegionCombineMode combineMode
)
C++/CLI  
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.

Example

This example will load an image, sets a magic wand region to it, fills the region with blue before saving the image back to disk

Visual Basic Copy Code
Public Sub AddMagicWandToRegionExample()
   RasterCodecs.Startup()
   Dim codecs As RasterCodecs = New RasterCodecs()

   Dim srcFileName As String = LeadtoolsExamples.Common.ImagesPath.Path + "Image1.cmp"
   Dim destFileName As String = LeadtoolsExamples.Common.ImagesPath.Path + "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 Point = New Point(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.FromGdiPlusColor(Color.Blue))
   fill.Run(image)

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

   image.Dispose()
   codecs.Dispose()
   RasterCodecs.Shutdown()
End Sub
C# Copy Code
public void AddMagicWandToRegionExample() 

   RasterCodecs.Startup(); 
   RasterCodecs codecs = new RasterCodecs(); 
 
   string srcFileName = LeadtoolsExamples.Common.ImagesPath.Path + "Image1.cmp"; 
   string destFileName = LeadtoolsExamples.Common.ImagesPath.Path + "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 
   Point pt = new Point(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.FromGdiPlusColor(Color.Blue)); 
   fill.Run(image); 
 
   // Save the image 
   codecs.Save(image, destFileName, RasterImageFormat.Bmp, 24); 
 
   image.Dispose(); 
   codecs.Dispose(); 
   RasterCodecs.Shutdown(); 
}

Remarks

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 inDocument/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.

Requirements

Target Platforms: Microsoft .NET Framework 3.0, Windows XP, Windows Server 2003 family, Windows Server 2008 family

See Also