HighQualityRotateCommand Class

Summary

Performs high quality rotation on a black and white image.

Syntax

Objective-C

C++

Java

public class HighQualityRotateCommand : RasterCommand

Public Class HighQualityRotateCommand  
   Inherits RasterCommand

@interface LTHighQualityRotateCommand : LTRasterCommand

public class HighQualityRotateCommand extends RasterCommand

public ref class HighQualityRotateCommand : public RasterCommand

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 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 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.

Example

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

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing; 
using Leadtools.ImageProcessing.Core; 
 
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:\LEADTOOLS21\Resources\Images"; 
}

Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.ImageProcessing.Core 
Imports Leadtools.ImageProcessing 
 
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:\LEADTOOLS21\Resources\Images" 
End Class