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GetOverlayImage Method

Summary

Gets the overlay image for the specified index.

Syntax
C#
VB
Java
Objective-C
C++
public RasterImage GetOverlayImage( 
   int index, 
   RasterGetSetOverlayImageMode mode 
) 
Public Function GetOverlayImage( _ 
   ByVal index As Integer, _ 
   ByVal mode As RasterGetSetOverlayImageMode _ 
) As RasterImage 
- (nullable LTRasterImage *)getOverlayForImageAtIndex:(NSInteger)index  
                                                 mode:(LTRasterGetSetOverlayImageMode)mode  
                                                error:(NSError **)error 
public RasterImage getOverlayImage( 
  int index,  
  RasterGetSetOverlayImageMode mode 
) 
public: 
RasterImage^ GetOverlayImage(  
   int index, 
   RasterGetSetOverlayImageMode mode 
)  

Parameters

index
The index of the overlay being retrieved. This index is zero-based and should be less or equal than MaxOverlays.

mode
Determines how to retreive the image, possible values are:

Mode Description
RasterGetSetOverlayImageMode.Copy A copy of the overlay image is retrieved from the overlay list.
RasterGetSetOverlayImageMode.NoCopy The actual overlay image is retrieved. No copy is made. You should be careful when modifying the returned overlay image because you can modify/invalidate the entry in the overlay bitmap list.
RasterGetSetOverlayImageMode.Move The actual overlay image is retrieved. The image is also removed from the overlay list. This is recommended over RasterGetSetOverlayImageMode.NoCopy.

Return Value

A RasterImage object that represents the overlay image of the specified index.

Remarks

This method is available in the (Document/Medical only) Toolkits.

This method can be used to get a copy of the overlay image (RasterGetSetOverlayImageMode.Copy) or to get the image without making a copy (RasterGetSetOverlayImageMode.NoCopy or RasterGetSetOverlayImageMode.Move).

The quickest way to get the overlay image is to avoid making a copy. For more information on using RasterGetSetOverlayImageMode.NoCopy, refer to the "Remarks" section of SetOverlayImage.

For more information, refer to Overlay Overview.

Example
C#
VB
using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing; 
using Leadtools.ImageProcessing.Core; 
using Leadtools.ImageProcessing.Color; 
using Leadtools.Dicom; 
using Leadtools.Drawing; 
using Leadtools.Controls; 
using LeadtoolsExamples.Common; 
using Leadtools.Svg; 
 
public void GetOverlayImageExample() 
{ 
   RasterCodecs codecs = new RasterCodecs(); 
   // load an image and set an overlay 
   RasterImage image = codecs.Load(Path.Combine(ImagesPath.Path, "IMAGE2.DCM"), 0, CodecsLoadByteOrder.BgrOrGray, 1, 1); 
   RasterImage imageOverlay1 = codecs.Load(Path.Combine(ImagesPath.Path, "ULAY1.BMP"), 1, CodecsLoadByteOrder.Rgb, 1, 1); 
   RasterImage imageOverlay2 = codecs.Load(Path.Combine(ImagesPath.Path, "ULAY1.BMP"), 1, CodecsLoadByteOrder.Rgb, 1, 1); 
   image.SetOverlayImage(0, imageOverlay1, RasterGetSetOverlayImageMode.Copy); 
   image.SetOverlayImage(1, imageOverlay2, RasterGetSetOverlayImageMode.Copy); 
 
   // update the attributes of one of the overlays 
   RasterOverlayAttributes attributes = image.GetOverlayAttributes(0, 
      RasterGetSetOverlayAttributesFlags.Color | 
      RasterGetSetOverlayAttributesFlags.Flags | 
      RasterGetSetOverlayAttributesFlags.Origin | 
      RasterGetSetOverlayAttributesFlags.BitIndex); 
 
   attributes.Color = new RasterColor(255, 255, 255); 
   attributes.AutoPaint = true; 
   attributes.AutoProcess = true; 
   attributes.Origin = new LeadPoint(5, 5); 
   attributes.BitPosition = image.BitsPerPixel - 1; 
 
   image.UpdateOverlayAttributes( 
      0, 
      attributes, 
      RasterGetSetOverlayAttributesFlags.Color | 
      RasterGetSetOverlayAttributesFlags.Flags | 
      RasterGetSetOverlayAttributesFlags.Origin | 
      RasterGetSetOverlayAttributesFlags.BitIndex); 
 
 
   int count = image.OverlayCount; 
   for (int i = 0; i < count; i++) 
   { 
      using (RasterImage overlayTest = image.GetOverlayImage(i, RasterGetSetOverlayImageMode.NoCopy)) 
      { 
         string fileName = string.Format(Path.Combine(ImagesPath.Path, "overlay{0}_copy.bmp"), i); 
         codecs.Save(overlayTest, fileName, RasterImageFormat.Bmp, 1); 
      } 
   } 
 
   image.Dispose(); 
   imageOverlay1.Dispose(); 
   imageOverlay2.Dispose(); 
   codecs.Dispose(); 
} 
Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.ImageProcessing 
Imports Leadtools.ImageProcessing.Core 
Imports Leadtools.ImageProcessing.Color 
Imports Leadtools.Controls 
Imports Leadtools.Dicom 
Imports Leadtools.Drawing 
Imports Leadtools.Svg 
 
Public Sub GetOverlayImageExample() 
   Dim codecs As RasterCodecs = New RasterCodecs() 
   ' load an image and set an overlay 
   Dim image As RasterImage = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "IMAGE2.DCM"), 0, CodecsLoadByteOrder.BgrOrGray, 1, 1) 
   Dim imageOverlay1 As RasterImage = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "ULAY1.BMP"), 1, CodecsLoadByteOrder.Rgb, 1, 1) 
   Dim imageOverlay2 As RasterImage = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "ULAY1.BMP"), 1, CodecsLoadByteOrder.Rgb, 1, 1) 
   image.SetOverlayImage(0, imageOverlay1, RasterGetSetOverlayImageMode.Copy) 
   image.SetOverlayImage(1, imageOverlay2, RasterGetSetOverlayImageMode.Copy) 
 
   ' update the attributes of one of the overlays 
   Dim attributes As RasterOverlayAttributes = image.GetOverlayAttributes( 
      0, RasterGetSetOverlayAttributesFlags.Color Or RasterGetSetOverlayAttributesFlags.Flags Or 
      RasterGetSetOverlayAttributesFlags.Origin Or RasterGetSetOverlayAttributesFlags.BitIndex) 
 
   attributes.Color = New RasterColor(255, 255, 255) 
   attributes.AutoPaint = True 
   attributes.AutoProcess = True 
   attributes.Origin = New LeadPoint(5, 5) 
   attributes.BitPosition = image.BitsPerPixel - 1 
 
   image.UpdateOverlayAttributes(0, attributes, RasterGetSetOverlayAttributesFlags.Color Or 
                                 RasterGetSetOverlayAttributesFlags.Flags Or RasterGetSetOverlayAttributesFlags.Origin Or 
                                 RasterGetSetOverlayAttributesFlags.BitIndex) 
 
 
   Dim count As Integer = image.OverlayCount 
   Dim i As Integer = 0 
   Do While i < count 
      Dim overlayTest As RasterImage = image.GetOverlayImage(i, RasterGetSetOverlayImageMode.NoCopy) 
      Try 
         Dim fileName As String = String.Format(Path.Combine(LEAD_VARS.ImagesDir, "overlay{0}_copy.bmp"), i) 
         codecs.Save(overlayTest, fileName, RasterImageFormat.Bmp, 1) 
      Finally 
         CType(overlayTest, IDisposable).Dispose() 
      End Try 
      i += 1 
   Loop 
 
   image.Dispose() 
   imageOverlay1.Dispose() 
   imageOverlay2.Dispose() 
   codecs.Dispose() 
End Sub 
 
Public NotInheritable Class LEAD_VARS 
   Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images" 
End Class 
c#[Silverlight C# Example] 
using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.Dicom; 
using Leadtools.ImageProcessing; 
using Leadtools.ImageProcessing.Core; 
using Leadtools.ImageProcessing.Color; 
using Leadtools.Examples; 
using Leadtools.Windows.Media; 
 
public void GetOverlayImageExample(RasterImage image, RasterImage imageOverlay1, RasterImage imageOverlay2, Stream destStream1, Stream destStream2) 
{ 
   // for this sample: 
   //  image         == 24-bit image (image1.cmp) 
   //  imageOverlay1 == 1-bit image (ulay1.bmp) 
   //  imageOverlay2 == 1-bit image (ulay2.bmp) 
   image.SetOverlayImage(0, imageOverlay1, RasterGetSetOverlayImageMode.Copy); 
   image.SetOverlayImage(1, imageOverlay2, RasterGetSetOverlayImageMode.Copy); 
 
   // update the attributes of one of the overlays 
   RasterOverlayAttributes attributes = image.GetOverlayAttributes(0, 
      RasterGetSetOverlayAttributesFlags.Color | 
      RasterGetSetOverlayAttributesFlags.Flags | 
      RasterGetSetOverlayAttributesFlags.Origin | 
      RasterGetSetOverlayAttributesFlags.BitIndex); 
 
   attributes.Color = new RasterColor(255, 255, 255); 
   attributes.AutoPaint = true; 
   attributes.AutoProcess = true; 
   attributes.Origin = new LeadPoint(5, 5); 
   attributes.BitPosition = image.BitsPerPixel - 1; 
 
   image.UpdateOverlayAttributes( 
      0, 
      attributes, 
      RasterGetSetOverlayAttributesFlags.Color | 
      RasterGetSetOverlayAttributesFlags.Flags | 
      RasterGetSetOverlayAttributesFlags.Origin | 
      RasterGetSetOverlayAttributesFlags.BitIndex); 
 
   RasterCodecs codecs = new RasterCodecs(); 
   int count = image.OverlayCount; 
   Debug.Assert(count == 2); 
 
   RasterImage overlayTest = image.GetOverlayImage(0, RasterGetSetOverlayImageMode.NoCopy); 
   codecs.Save(overlayTest, destStream1, RasterImageFormat.Png, 1); 
   overlayTest = image.GetOverlayImage(0, RasterGetSetOverlayImageMode.NoCopy); 
   codecs.Save(overlayTest, destStream2, RasterImageFormat.Png, 1); 
 
   image.Dispose(); 
   overlayTest.Dispose(); 
   imageOverlay1.Dispose(); 
   imageOverlay2.Dispose(); 
} 
vb[Silverlight VB Example] 
Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.Dicom 
Imports Leadtools.ImageProcessing 
Imports Leadtools.ImageProcessing.Core 
Imports Leadtools.ImageProcessing.Color 
Imports Leadtools.Windows.Media 
 
Public Sub GetOverlayImageExample(ByVal image As RasterImage, ByVal imageOverlay1 As RasterImage, ByVal imageOverlay2 As RasterImage, ByVal destStream1 As Stream, ByVal destStream2 As Stream) 
   ' for this sample: 
   '  image         == 24-bit image (image1.cmp) 
   '  imageOverlay1 == 1-bit image (ulay1.bmp) 
   '  imageOverlay2 == 1-bit image (ulay2.bmp) 
   image.SetOverlayImage(0, imageOverlay1, RasterGetSetOverlayImageMode.Copy) 
   image.SetOverlayImage(1, imageOverlay2, RasterGetSetOverlayImageMode.Copy) 
 
   ' update the attributes of one of the overlays 
   Dim attributes As RasterOverlayAttributes = image.GetOverlayAttributes(0, RasterGetSetOverlayAttributesFlags.Color Or RasterGetSetOverlayAttributesFlags.Flags Or RasterGetSetOverlayAttributesFlags.Origin Or 
      RasterGetSetOverlayAttributesFlags.BitIndex) 
 
   attributes.Color = New RasterColor(255, 255, 255) 
   attributes.AutoPaint = True 
   attributes.AutoProcess = True 
   attributes.Origin = New LeadPoint(5, 5) 
   attributes.BitPosition = image.BitsPerPixel - 1 
 
   image.UpdateOverlayAttributes(0, attributes, RasterGetSetOverlayAttributesFlags.Color Or RasterGetSetOverlayAttributesFlags.Flags Or RasterGetSetOverlayAttributesFlags.Origin Or RasterGetSetOverlayAttributesFlags.BitIndex) 
 
   Dim codecs As RasterCodecs = New RasterCodecs() 
   Dim count As Integer = image.OverlayCount 
   Debug.Assert(count = 2) 
 
   Dim overlayTest As RasterImage = image.GetOverlayImage(0, RasterGetSetOverlayImageMode.NoCopy) 
   codecs.Save(overlayTest, destStream1, RasterImageFormat.Png, 1) 
   overlayTest = image.GetOverlayImage(0, RasterGetSetOverlayImageMode.NoCopy) 
   codecs.Save(overlayTest, destStream2, RasterImageFormat.Png, 1) 
 
   image.Dispose() 
   overlayTest.Dispose() 
   imageOverlay1.Dispose() 
   imageOverlay2.Dispose() 
End Sub 

Requirements

Target Platforms

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