HighQualityRotateCommand Class

Performs high quality rotation on a black and white image.

Object Model

Syntax

C#
Visual Basic
WinRT C#
Java
Objective-C
WinRT JavaScript
C++

public class HighQualityRotateCommand : Leadtools.ImageProcessing.RasterCommand, Leadtools.ImageProcessing.IRasterCommand

'Declaration

Public Class HighQualityRotateCommand 
   Inherits Leadtools.ImageProcessing.RasterCommand
   Implements Leadtools.ImageProcessing.IRasterCommand

'Usage

Dim instance As HighQualityRotateCommand

public sealed class HighQualityRotateCommand : Leadtools.ImageProcessing.IRasterCommand

@interface LTHighQualityRotateCommand : LTRasterCommand

public class HighQualityRotateCommand extends RasterCommand

function Leadtools.ImageProcessing.Core.HighQualityRotateCommand()

public ref class HighQualityRotateCommand : public Leadtools.ImageProcessing.RasterCommand, Leadtools.ImageProcessing.IRasterCommand

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.

In Silverlight versions of LEADTOOLS, this image processing command will fail if the image data for the RasterImage object is stored internally using a Silverlight WriteableBitmap object. For more information, refer to Image Processing Command Limitations in Silverlight.

Example

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

C#
Visual Basic
WinRT C#
WinRT JavaScript
Silverlight C#
Silverlight VB

Copy Code

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:\Users\Public\Documents\LEADTOOLS Images"
End Class

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:\Users\Public\Documents\LEADTOOLS Images";
}

function HighQualityRotateCommandExample() {
   var codecs = new Leadtools.Codecs.RasterCodecs();
   var loadedImage;

   // Get an image
   var angle = 30 * 100;
   var fillColor = Leadtools.RasterColorHelper.fromKnownColor(Leadtools.RasterKnownColor.white);

   // Load the image, rotate normally by 30 degrees and save
   var srcFileName = "Assets\\ocr1.tif";
   return Tools.AppInstallFolder().getFileAsync(srcFileName).then(function (loadFile) {
      return codecs.loadAsync(Leadtools.LeadStreamFactory.create(loadFile));
   }).then(function (image) {
      loadedImage = image;
      // Prepare the command
      with (Leadtools.ImageProcessing) {
         var cmd = new RotateCommand();
         cmd.angle = angle;
         cmd.flags = RotateCommandFlags.resize | RotateCommandFlags.bicubic;
         cmd.fillColor = fillColor;
         cmd.run(image);
      }

      var destFileName = "ocr1_NormalRotated.tif";
      return Tools.AppLocalFolder().createFileAsync(destFileName);
   }).then(function (saveFile) {
      return codecs.saveAsync(loadedImage, Leadtools.LeadStreamFactory.create(saveFile), loadedImage.originalFormat, loadedImage.bitsPerPixel);
   }).then(function () {

      // Load the image, rotate with high quality by 30 degrees and save
      srcFileName = "Assets\\ocr1.tif";
      return Tools.AppInstallFolder().getFileAsync(srcFileName);
   }).then(function (loadFile) {
      return codecs.loadAsync(Leadtools.LeadStreamFactory.create(loadFile));
   }).then(function (image) {
      loadedImage = image;
      with (Leadtools.ImageProcessing.Core) {
         var cmd = new HighQualityRotateCommand();
         cmd.angle = angle;
         cmd.flags = HighQualityRotateCommandFlags.resize | HighQualityRotateCommandFlags.bestQuality;
         cmd.fillColor = fillColor;
         cmd.run(image);
      }

      var destFileName = "ocr1_HighQualityRotated.tif";
      return Tools.AppLocalFolder().createFileAsync(destFileName);
   }).then(function (saveFile) {
      return codecs.saveAsync(loadedImage, Leadtools.LeadStreamFactory.create(saveFile), loadedImage.originalFormat, loadedImage.bitsPerPixel);
   });

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

using Leadtools;
using Leadtools.Codecs;
using Leadtools.ImageProcessing.Core;
using Leadtools.ImageProcessing;

      
public async Task HighQualityRotateCommandExample()
{
   RasterCodecs codecs = new RasterCodecs();
   // Get an image
   int angle = 30 * 100;
   RasterColor fillColor = RasterColorHelper.FromKnownColor(RasterKnownColor.White);

   // Load the image, rotate normally by 30 degrees and save
   string srcFileName = @"Assets\ocr1.tif";
   StorageFile loadFile = await Tools.AppInstallFolder.GetFileAsync(srcFileName);
   using (RasterImage image = await codecs.LoadAsync(LeadStreamFactory.Create(loadFile)))
   {
      RotateCommand cmd = new RotateCommand();
      cmd.Angle = angle;
      cmd.Flags = RotateCommandFlags.Resize | RotateCommandFlags.Bicubic;
      cmd.FillColor = fillColor;
      cmd.Run(image);
      string destFileName = @"ocr1_NormalRotated.tif";
      StorageFile saveFile = await Tools.AppLocalFolder.CreateFileAsync(destFileName);
      await codecs.SaveAsync(image, LeadStreamFactory.Create(saveFile), image.OriginalFormat, image.BitsPerPixel);
   }

   // Load the image, rotate with high quality by 30 degrees and save
   srcFileName = @"Assets\ocr1.tif";
   loadFile = await Tools.AppInstallFolder.GetFileAsync(srcFileName);
   using (RasterImage image = await codecs.LoadAsync(LeadStreamFactory.Create(loadFile)))
   {
      HighQualityRotateCommand cmd = new HighQualityRotateCommand();
      cmd.Angle = angle;
      cmd.Flags = HighQualityRotateCommandFlags.Resize | HighQualityRotateCommandFlags.BestQuality;
      cmd.FillColor = fillColor;
      cmd.Run(image);
      string destFileName = @"ocr1_HighQualityRotated.tif";
      StorageFile saveFile = await Tools.AppLocalFolder.CreateFileAsync(destFileName);
      await codecs.SaveAsync(image, LeadStreamFactory.Create(saveFile), 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();
}

using Leadtools;
using Leadtools.ImageProcessing;
using Leadtools.Examples;
using Leadtools.Codecs;
using Leadtools.ImageProcessing.Core;

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();
}

Imports Leadtools
Imports Leadtools.ImageProcessing
Imports Leadtools.Codecs
Imports Leadtools.ImageProcessing.Core

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

Requirements

Target Platforms

Reference

HighQualityRotateCommand Members
Leadtools.ImageProcessing.Core Namespace
Cleaning Up 1-Bit Images
SmoothCommand Class
BorderRemoveCommand Class
LineRemoveCommand Class
InvertedTextCommand Class
InvertedPageCommand Class
DotRemoveCommand Class
HolePunchRemoveCommand Class
HighQualityRotateCommand Class
MinimumCommand Class
MaximumCommand Class
Leadtools.ImageProcessing.Effects.RegionHolesRemovalCommand