Public Sub ChangeViewPerspective( _
   ByVal viewPerspective As RasterViewPerspective _
) 

Dim instance As RasterImage
Dim viewPerspective As RasterViewPerspective
 
instance.ChangeViewPerspective(viewPerspective)

public void ChangeViewPerspective( 
   RasterViewPerspective viewPerspective
)

public:
void ChangeViewPerspective( 
   RasterViewPerspective viewPerspective
) 

Public Sub GetRowCompressedExample()
      Dim codecs As RasterCodecs = New RasterCodecs()
      ' Load the bitmap, at 1 bit per pixel, compressed
      codecs.Options.Load.Compressed = True
      Dim image As RasterImage = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "OCR1.TIF"), 1, CodecsLoadByteOrder.Bgr, 1, 1)

      ' This example does not work with rotated view perspectives.
      If (image.ViewPerspective <> RasterViewPerspective.TopLeft) OrElse (image.ViewPerspective <> RasterViewPerspective.BottomLeft) Then
         image.ChangeViewPerspective(RasterViewPerspective.TopLeft)
      End If

      ' Adjust the YOffset if the view perspective is bottom left.
      Dim nRow As Integer = 500 ' first row to get.
      Dim nYSize As Integer = 500 ' number of rows to get.

      If image.ViewPerspective = RasterViewPerspective.BottomLeft Then
         nRow = image.Height - nRow - nYSize
      End If

      ' Allocate the buffers.
      Dim pBuffer As Byte() = New Byte(Convert.ToInt32((((image.Width + 31) And Not (31)) / 8)) * nYSize - 1) {} ' Buffer to hold the expanded row.
      Dim pRunBuffer As System.UInt16() = New System.UInt16(((image.Width + 3) * 2) * nYSize - 1) {} ' Buffer to hold the compressed row.

      If image.IsGlobalMemory Then
         image.Access()
      End If
      ' Get the top nRow lines.
      image.GetRowCompressed(Nothing, pRunBuffer, 0, nRow, nYSize)
      ' Expand the compressed data.
      RasterRleCompressor.ExpandRows(pRunBuffer, pBuffer, 0, image.Width, nYSize)
      ' Invert the data.

      Dim n As Integer = 0
      Do While n < (image.BytesPerLine * nYSize)
         pBuffer(n) = pBuffer(n) Xor Convert.ToByte(&HFF)
         n += 1
      Loop


      ' Compress the inverted data.
      RasterRleCompressor.CompressRows(pRunBuffer, pBuffer, 0, image.Width, nYSize)

      ' Put the inverted, compressed data back into the image.
      image.SetRowCompressed(Nothing, pRunBuffer, 0, nRow, nYSize)

      If image.IsGlobalMemory Then
         image.Release()
      End If

      codecs.Save(image, Path.Combine(LEAD_VARS.ImagesDir, "IMAGE1_getrowcompresed.BMP"), RasterImageFormat.Bmp, 0)

      image.Dispose()
      codecs.Dispose()
   End Sub

Public NotInheritable Class LEAD_VARS
   Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
End Class

public void GetRowCompressedExample()
   {
      RasterCodecs codecs = new RasterCodecs();
      // Load the bitmap, at 1 bit per pixel, compressed
      codecs.Options.Load.Compressed = true;
      RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "OCR1.TIF"), 1, Leadtools.Codecs.CodecsLoadByteOrder.Bgr, 1, 1);

      // This example does not work with rotated view perspectives.
      if((image.ViewPerspective != RasterViewPerspective.TopLeft) || (image.ViewPerspective != RasterViewPerspective.BottomLeft))
         image.ChangeViewPerspective(RasterViewPerspective.TopLeft);

      // Adjust the YOffset if the view perspective is bottom left.
      int nRow = 500; // first row to get.
      int nYSize = 500; // number of rows to get.

      if(image.ViewPerspective == RasterViewPerspective.BottomLeft)
         nRow = image.Height - nRow - nYSize;

      // Allocate the buffers.
      byte[] pBuffer = new byte[Convert.ToInt32((((image.Width + 31) & ~(31)) / 8)) * nYSize]; // Buffer to hold the expanded row.
      ushort[] pRunBuffer = new ushort[((image.Width + 3) * 2) * nYSize]; // Buffer to hold the compressed row.

      if(image.IsGlobalMemory)
         image.Access();
      // Get the top nRow lines.
      image.GetRowCompressed(null, pRunBuffer, 0, nRow, nYSize);
      // Expand the compressed data.
      RasterRleCompressor.ExpandRows(pRunBuffer, pBuffer, 0, image.Width, nYSize);
      // Invert the data.

      for(int n = 0; n < (image.BytesPerLine * nYSize); n++)
         pBuffer[n] ^= 0xff;


      // Compress the inverted data.
      RasterRleCompressor.CompressRows(pRunBuffer, pBuffer, 0, image.Width, nYSize);

      // Put the inverted, compressed data back into the image.
      image.SetRowCompressed(null, pRunBuffer, 0, nRow, nYSize);

      if(image.IsGlobalMemory)
         image.Release();

      codecs.Save(image,Path.Combine(LEAD_VARS.ImagesDir,"IMAGE1_getrowcompresed.BMP"), RasterImageFormat.Bmp, 0);

      image.Dispose();
      codecs.Dispose();
   }

static class LEAD_VARS
{
   public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images";
}