Performs high quality rotation on a black and white image.
public class HighQualityRotateCommand : RasterCommand
Public Class HighQualityRotateCommand
Inherits RasterCommand
@interface LTHighQualityRotateCommand : LTRasterCommand
public class HighQualityRotateCommand extends RasterCommand
public ref class HighQualityRotateCommand : public RasterCommand
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.
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:\Users\Public\Documents\LEADTOOLS 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:\Users\Public\Documents\LEADTOOLS Images"
End Class
c#[Silverlight C# Example]
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();
}
vb[Silverlight VB Example]
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
HighQualityRotateCommand Members
Leadtools.ImageProcessing.Core Namespace
HighQualityRotateCommand Class
Help Collections
Raster .NET | C API | C++ Class Library | HTML5 JavaScript
Document .NET | C API | C++ Class Library | HTML5 JavaScript
Medical .NET | C API | C++ Class Library | HTML5 JavaScript
Medical Web Viewer .NET
Multimedia
Direct Show .NET | C API | Filters
Media Foundation .NET | C API | Transforms
Supported Platforms
.NET, Java, Android, and iOS/macOS Assemblies
Imaging, Medical, and Document
C API/C++ Class Libraries
Imaging, Medical, and Document
HTML5 JavaScript Libraries
Imaging, Medical, and Document