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)

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

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();  }

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.

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

Reference