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HighQualityRotateCommand Class
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Leadtools.ImageProcessing.Core Namespace : HighQualityRotateCommand Class



Perform high quality rotation on a black and white image. Supported in Silverlight, Windows Phone 7

Object Model

HighQualityRotateCommand Class

Syntax

Visual Basic (Declaration) 
Public Class HighQualityRotateCommand 
   Inherits Leadtools.ImageProcessing.RasterCommand
   Implements IRasterCommand 
Visual Basic (Usage)Copy Code
Dim instance As HighQualityRotateCommand
C# 
public class HighQualityRotateCommand : Leadtools.ImageProcessing.RasterCommand, IRasterCommand  
C++/CLI 
public ref class HighQualityRotateCommand : public Leadtools.ImageProcessing.RasterCommand, IRasterCommand  

Example

This example will show the difference between normal rotation (Leadtools.ImageProcessing.RotateCommand) and high quality rotation (HighQualityRotateCommand) when performed on a 1 bits/pixel image.

Visual BasicCopy Code
Public Sub HighQualityRotateCommandExample()
   Dim codecs As New RasterCodecs()

   ' Get an image
   Dim tifFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "ocr1.tif")
   Dim normalRotateFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "ocr1_NormalRotated.tif")
   Dim highQualityRotateFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "ocr1_HighQualityRotated.tif")

   Dim angle As Integer = 30 * 100
   Dim fillColor As RasterColor = RasterColor.FromKnownColor(RasterKnownColor.White)

   ' Load the image, rotate normally by 30 degrees and save
   Using image As RasterImage = codecs.Load(tifFileName)
      Dim cmd As New RotateCommand()
      cmd.Angle = angle
      cmd.Flags = RotateCommandFlags.Resize Or RotateCommandFlags.Bicubic
      cmd.FillColor = fillColor
      cmd.Run(image)
      codecs.Save(image, normalRotateFileName, image.OriginalFormat, image.BitsPerPixel)
   End Using

   ' Load the image, rotate with high quality by 30 degrees and save
   Using image As RasterImage = codecs.Load(tifFileName)
      Dim cmd As New HighQualityRotateCommand()
      cmd.Angle = angle
      cmd.Flags = HighQualityRotateCommandFlags.Resize Or HighQualityRotateCommandFlags.BestQuality
      cmd.FillColor = fillColor
      cmd.Run(image)
      codecs.Save(image, highQualityRotateFileName, image.OriginalFormat, image.BitsPerPixel)
   End Using

   ' Now compare the saved TIF files and notice the difference in quality between
   ' the normal rotate and high quality

   codecs.Dispose()
End Sub

Public NotInheritable Class LEAD_VARS
   Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
End Class
C#Copy Code
public void HighQualityRotateCommandExample()
   {
      RasterCodecs codecs = new RasterCodecs();

      // Get an image
      string tifFileName = Path.Combine(LEAD_VARS.ImagesDir, "ocr1.tif");
      string normalRotateFileName = Path.Combine(LEAD_VARS.ImagesDir, "ocr1_NormalRotated.tif");
      string highQualityRotateFileName = Path.Combine(LEAD_VARS.ImagesDir, "ocr1_HighQualityRotated.tif");

      int angle = 30 * 100;
      RasterColor fillColor = RasterColor.FromKnownColor(RasterKnownColor.White);

      // Load the image, rotate normally by 30 degrees and save
      using(RasterImage image = codecs.Load(tifFileName))
      {
         RotateCommand cmd = new RotateCommand();
         cmd.Angle = angle;
         cmd.Flags = RotateCommandFlags.Resize | RotateCommandFlags.Bicubic;
         cmd.FillColor = fillColor;
         cmd.Run(image);
         codecs.Save(image, normalRotateFileName, image.OriginalFormat, image.BitsPerPixel);
      }


      // Load the image, rotate with high quality by 30 degrees and save
      using(RasterImage image = codecs.Load(tifFileName))
      {
         HighQualityRotateCommand cmd = new HighQualityRotateCommand();
         cmd.Angle = angle;
         cmd.Flags = HighQualityRotateCommandFlags.Resize | HighQualityRotateCommandFlags.BestQuality;
         cmd.FillColor = fillColor;
         cmd.Run(image);
         codecs.Save(image, highQualityRotateFileName, image.OriginalFormat, image.BitsPerPixel);
      }

      // Now compare the saved TIF files and notice the difference in quality between
      // the normal rotate and high quality

      codecs.Dispose();
   }

static class LEAD_VARS
{
   public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images";
}
SilverlightCSharpCopy Code
public void HighQualityRotateCommandExample(RasterImage image1, Stream outStream1, Stream outStream2)
{
   RasterImage image2 = image1.Clone();
   RasterCodecs codecs = new RasterCodecs();
   int angle = 30 * 100;
   RasterColor fillColor = new RasterColor(255, 255, 255);

   // rotate normally by 30 degrees and save
   RotateCommand cmd1 = new RotateCommand();
   cmd1.Angle = angle;
   cmd1.Flags = RotateCommandFlags.Resize | RotateCommandFlags.Bicubic;
   cmd1.FillColor = fillColor;
   cmd1.Run(image1);
   // save result image to "ocr1_NormalRotated.tif"
   codecs.Save(image1, outStream1, image1.OriginalFormat, image1.BitsPerPixel);

   // rotate with high quality by 30 degrees and save
   HighQualityRotateCommand cmd2 = new HighQualityRotateCommand();
   cmd2.Angle = angle;
   cmd2.Flags = HighQualityRotateCommandFlags.Resize | HighQualityRotateCommandFlags.BestQuality;
   cmd2.FillColor = fillColor;
   cmd2.Run(image2);

   // save result image to "ocr1_HighQualityRotated.tif"
   codecs.Save(image2, outStream2, image2.OriginalFormat, image2.BitsPerPixel);

   // Now compare the saved TIF files and notice the difference in quality between
   // the normal rotate and high quality
   image1.Dispose();
   image2.Dispose();
}
SilverlightVBCopy Code
Public Sub HighQualityRotateCommandExample(ByVal image1 As RasterImage, ByVal outStream1 As Stream, ByVal outStream2 As Stream)
   Dim image2 As RasterImage = image1.Clone()
   Dim codecs As RasterCodecs = New RasterCodecs()
   Dim angle As Integer = 30 * 100
   Dim fillColor As RasterColor = New RasterColor(255, 255, 255)

   ' rotate normally by 30 degrees and save
   Dim cmd1 As RotateCommand = New RotateCommand()
   cmd1.Angle = angle
   cmd1.Flags = RotateCommandFlags.Resize Or RotateCommandFlags.Bicubic
   cmd1.FillColor = fillColor
   cmd1.Run(image1)
   ' save result image to "ocr1_NormalRotated.tif"
   codecs.Save(image1, outStream1, image1.OriginalFormat, image1.BitsPerPixel)

   ' rotate with high quality by 30 degrees and save
   Dim cmd2 As HighQualityRotateCommand = New HighQualityRotateCommand()
   cmd2.Angle = angle
   cmd2.Flags = HighQualityRotateCommandFlags.Resize Or HighQualityRotateCommandFlags.BestQuality
   cmd2.FillColor = fillColor
   cmd2.Run(image2)

   ' save result image to "ocr1_HighQualityRotated.tif"
   codecs.Save(image2, outStream2, image2.OriginalFormat, image2.BitsPerPixel)

   ' Now compare the saved TIF files and notice the difference in quality between
   ' the normal rotate and high quality
   image1.Dispose()
   image2.Dispose()
End Sub

Remarks

The HighQualityRotateCommand can be used to perform high quality rotation on a black and white (1 bits/pixel) images in any angle.

Normal rotation commands such as Leadtools.ImageProcessing.RotateCommand will rotate the image data as is, which may result in less than desired quality due to the limited number of bits/pixel of the image (1 bit). This command will temporarily convert the image to 8 bits/pixel internally, perform the rotation and then convert the image back to 1 bits/pixel.

This command only works with a 1 bits/pixel images (a Leadtools.RasterImage with RasterImage.BitsPerPixel equals to 1). Using this command on any other image type will result in an exception.

This command does not support signed data images.

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

Inheritance Hierarchy

System.Object
   Leadtools.ImageProcessing.RasterCommand
      Leadtools.ImageProcessing.Core.HighQualityRotateCommand

Requirements

Target Platforms: Silverlight 3.0, Windows XP, Windows Server 2003 family, Windows Server 2008 family, Windows Vista, Windows 7, MAC OS/X (Intel Only)

See Also