Public Sub AddColorRgbRangeToRegion( _
   ByVal lowerColor As RasterColor, _
   ByVal upperColor As RasterColor, _
   ByVal combineMode As RasterRegionCombineMode _
) 

Visual Basic (Usage)	Copy Code
Dim instance As RasterImage Dim lowerColor As RasterColor Dim upperColor As RasterColor Dim combineMode As RasterRegionCombineMode   instance.AddColorRgbRangeToRegion(lowerColor, upperColor, combineMode)

public void AddColorRgbRangeToRegion( 
   RasterColor lowerColor,
   RasterColor upperColor,
   RasterRegionCombineMode combineMode
)

public:
void AddColorRgbRangeToRegion( 
   RasterColor lowerColor,
   RasterColor upperColor,
   RasterRegionCombineMode combineMode
) 

Parameters

lowerColor

Specifies the minimum (inclusive) R, G and B values. A pixel must have R,G, and B all greater than or equal to lowerColor and less than or equal to upperColor to be included in the region.

upperColor

Specifies the maximum (inclusive) R, G and B values. A pixel must have R,G, and B all greater than or equal to lowerColor and less than or equal to upperColor to be included in the region.

combineMode

The action to take regarding the existing image region, if one is defined.

This example will load an image, adds a region corresponding to all colors that have an rgb that includes green but no red and no blue, run the InvertCommand to show the affected area before saving the image back to disk.

Visual Basic

Copy Code

Public Sub AddColorRgbRangeToRegionExample()    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_AddColorRgbRangeToRegion.bmp"    ' Load the image    Dim image As RasterImage = codecs.Load(srcFileName)    ' Add the region    Dim lowerColor As RasterColor = New RasterColor(0, 1, 0)    Dim upperColor As RasterColor = New RasterColor(0, 255, 0)    image.AddColorRgbRangeToRegion(lowerColor, upperColor, RasterRegionCombineMode.Set)    ' Draw something on the image    Dim command As InvertCommand = New InvertCommand()    command.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 AddColorRgbRangeToRegionExample()  {     RasterCodecs.Startup();     RasterCodecs codecs = new RasterCodecs();       string srcFileName = LeadtoolsExamples.Common.ImagesPath.Path + "Image1.cmp";     string destFileName = LeadtoolsExamples.Common.ImagesPath.Path + "Image1_AddColorRgbRangeToRegion.bmp";       // Load the image     RasterImage image = codecs.Load(srcFileName);       // Add the region     RasterColor lowerColor = new RasterColor(0, 1, 0);     RasterColor upperColor = new RasterColor(0, 255, 0);       image.AddColorRgbRangeToRegion(lowerColor, upperColor, RasterRegionCombineMode.Set);       // Draw something on the image     InvertCommand command = new InvertCommand();     command.Run(image);       // Save the image     codecs.Save(image, destFileName, RasterImageFormat.Bmp, 24);       image.Dispose();     codecs.Dispose();     RasterCodecs.Shutdown();  }

This method uses the RGB color model to set a region based on a color range.

To be added to the region a color must fall in the range lowerColor..upperColor. To set a region for all pure red, specify lowerColor and upperColor as follows:

lowerColor RGB(1,0,0)
upperColor RGB(255,0,0)

Note that this would fail to include many colors that look red to the eye (like RGB(255,4,4)).

This method 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 only in the Document/Medical Imaging editions.

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