<OperationContractAttribute("InvertedPage")>
<FaultContractAttribute(DetailType=Leadtools.Services.Raster.FaultContracts.RasterFault, 
   Action="", 
   Name="", 
   Namespace="", 
   HasProtectionLevel=False)>
Overridable Function InvertedPage( _
   ByVal request As InvertedPageRequest _
) As InvertedPageResponse

Visual Basic (Usage)	Copy Code
Dim instance As IDocumentProcessingService Dim request As InvertedPageRequest Dim value As InvertedPageResponse   value = instance.InvertedPage(request)

[OperationContractAttribute("InvertedPage")]
[FaultContractAttribute(DetailType=Leadtools.Services.Raster.FaultContracts.RasterFault, 
   Action="", 
   Name="", 
   Namespace="", 
   HasProtectionLevel=false)]
virtual InvertedPageResponse InvertedPage( 
   InvertedPageRequest request
)

[OperationContractAttribute("InvertedPage")]
[FaultContractAttribute(DetailType=Leadtools.Services.Raster.FaultContracts.RasterFault, 
   Action="", 
   Name="", 
   Namespace="", 
   HasProtectionLevel=false)]
virtual InvertedPageResponse InvertedPage( 
   InvertedPageRequest request
) 

Parameters

request

A DataContractAttribute containing the data that will be used in this InvertedPage operation.

Return Value

This example will show how to use the InvertedPage operation to check and auto-correct inverted images.

Visual Basic

Copy Code

Public Sub InvertedPageExample()    ' Get an image    Dim tifFileName As String = LeadtoolsExamples.Common.ImagesPath.Path & "ocr1.tif"    Dim invertedImageFileName As String = LeadtoolsExamples.Common.ImagesPath.Path & "ocr1_Inverted.tif"    Dim nonInvertedImageFileName As String = LeadtoolsExamples.Common.ImagesPath.Path & "ocr1_NonInverted.tif"    Dim documentProcessingClient As DocumentProcessingServiceClient = New DocumentProcessingServiceClient()    Dim sourceBinaryData As RawBinaryData = New RawBinaryData()    sourceBinaryData.Data = File.ReadAllBytes(tifFileName)    Dim convertOptions As RasterConvertOptions = New RasterConvertOptions()    convertOptions.Source = sourceBinaryData    convertOptions.Destination = Nothing    convertOptions.Format = RasterImageFormat.Tif    convertOptions.FirstPage = 1    convertOptions.LastPage = 1    convertOptions.BitsPerPixel = 1    convertOptions.QualityFactor = 2    Dim invertedPageRequest As InvertedPageRequest = New InvertedPageRequest()    invertedPageRequest.Flags = InvertedPageFlags.NoProcess    invertedPageRequest.ConvertOptions = convertOptions    invertedPageRequest.RegionData = Nothing    Dim invertedPageResponse As InvertedPageResponse = documentProcessingClient.InvertedPage(invertedPageRequest)    Console.WriteLine("Original image, inverted = {0}", invertedPageResponse.IsInverted)    ' Invert the image    Dim invertRequest As InvertRequest = New InvertRequest()    invertRequest.ConvertOptions = convertOptions    Dim colorProcessingClient As ColorProcessingServiceClient = New ColorProcessingServiceClient()    Dim invertResponse As CommandResponse = colorProcessingClient.Invert(invertRequest)    If Not invertResponse.Destination Is Nothing Then       If TypeOf invertResponse.Destination Is RawBinaryData Then          File.WriteAllBytes(invertedImageFileName, (TryCast(invertResponse.Destination, RawBinaryData)).Data)       End If    End If    colorProcessingClient.Close()    ' Check again    convertOptions.Source = invertResponse.Destination    invertedPageRequest.ConvertOptions = convertOptions    invertedPageResponse = documentProcessingClient.InvertedPage(invertedPageRequest)    Console.WriteLine("After running InvertCommand, inverted = {0}", invertedPageResponse.IsInverted)    ' Now run the command to un-invert the image    convertOptions.Source = invertedPageResponse.Destination    invertedPageRequest.Flags = InvertedPageFlags.Process    invertedPageResponse = documentProcessingClient.InvertedPage(invertedPageRequest)    ' Now check the image again    convertOptions.Source = invertedPageResponse.Destination    invertedPageRequest.Flags = InvertedPageFlags.NoProcess    invertedPageResponse = documentProcessingClient.InvertedPage(invertedPageRequest)    Console.WriteLine("After running InvertedPageCommand, inverted = {0}", invertedPageResponse.IsInverted)    If Not invertedPageResponse.Destination Is Nothing Then       If TypeOf invertedPageResponse.Destination Is RawBinaryData Then          File.WriteAllBytes(nonInvertedImageFileName, (TryCast(invertedPageResponse.Destination, RawBinaryData)).Data)       End If    End If End Sub

C#

Copy Code

public void InvertedPageExample()  {     // Get an image     string tifFileName = LeadtoolsExamples.Common.ImagesPath.Path + "ocr1.tif";     string invertedImageFileName = LeadtoolsExamples.Common.ImagesPath.Path + "ocr1_Inverted.tif";     string nonInvertedImageFileName = LeadtoolsExamples.Common.ImagesPath.Path + "ocr1_NonInverted.tif";     DocumentProcessingServiceClient documentProcessingClient = new DocumentProcessingServiceClient();       RawBinaryData sourceBinaryData = new RawBinaryData();     sourceBinaryData.Data = File.ReadAllBytes(tifFileName);       RasterConvertOptions convertOptions = new RasterConvertOptions();       convertOptions.Source = sourceBinaryData;     convertOptions.Destination = null;     convertOptions.Format = RasterImageFormat.Tif;     convertOptions.FirstPage = 1;     convertOptions.LastPage = 1;     convertOptions.BitsPerPixel = 1;     convertOptions.QualityFactor = 2;       InvertedPageRequest invertedPageRequest = new InvertedPageRequest();     invertedPageRequest.Flags = InvertedPageCommandFlags.NoProcess;       invertedPageRequest.ConvertOptions = convertOptions;     invertedPageRequest.RegionData = null;       InvertedPageResponse invertedPageResponse = documentProcessingClient.InvertedPage(invertedPageRequest);     Console.WriteLine("Original image, inverted = {0}", invertedPageResponse.IsInverted);       // Invert the image     InvertRequest invertRequest = new InvertRequest();     invertRequest.ConvertOptions = convertOptions;     ColorProcessingServiceClient colorProcessingClient = new ColorProcessingServiceClient();     CommandResponse invertResponse = colorProcessingClient.Invert(invertRequest);     if (invertResponse.Destination != null)     {        if (invertResponse.Destination is RawBinaryData)           File.WriteAllBytes(invertedImageFileName, (invertResponse.Destination as RawBinaryData).Data);     }     colorProcessingClient.Close();         // Check again     convertOptions.Source = invertResponse.Destination;     invertedPageRequest.ConvertOptions = convertOptions;     invertedPageResponse = documentProcessingClient.InvertedPage(invertedPageRequest);     Console.WriteLine("After running InvertCommand, inverted = {0}", invertedPageResponse.IsInverted);       // Now run the command to un-invert the image     convertOptions.Source = invertedPageResponse.Destination;     invertedPageRequest.Flags = InvertedPageCommandFlags.Process;     invertedPageResponse = documentProcessingClient.InvertedPage(invertedPageRequest);       // Now check the image again     convertOptions.Source = invertedPageResponse.Destination;     invertedPageRequest.Flags = InvertedPageCommandFlags.NoProcess;     invertedPageResponse = documentProcessingClient.InvertedPage(invertedPageRequest);     Console.WriteLine("After running InvertedPageCommand, inverted = {0}", invertedPageResponse.IsInverted);     if (invertedPageResponse.Destination != null)     {        if (invertedPageResponse.Destination is RawBinaryData)           File.WriteAllBytes(nonInvertedImageFileName, (invertedPageResponse.Destination as RawBinaryData).Data);     }  }

An inverted image is an image that has text or other objects in high contrast color on a low contrast background, for example white text on black background. This operation can check if an image is inverted as well as auto-correct.

This operation can only detect an entire image, to search for and correct specific inverted areas or regions in an image, use InvertedText.

A common source of inverted images are black and white bitmaps saved with non-standard palette by some applications.

This operation does not support signed data images.

For more information, refer to Cleaning Up 1-Bit Images.

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

Reference