GammaCorrectExtendedCommand Class

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

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

'Declaration
 
Public Class GammaCorrectExtendedCommand 
   Inherits Leadtools.ImageProcessing.RasterCommand
   Implements Leadtools.ImageProcessing.IRasterCommand

'Usage
 
Dim instance As GammaCorrectExtendedCommand

public sealed class GammaCorrectExtendedCommand : Leadtools.ImageProcessing.IRasterCommand

@interface LTGammaCorrectExtendedCommand : LTRasterCommand

public class GammaCorrectExtendedCommand extends RasterCommand

function Leadtools.ImageProcessing.Color.GammaCorrectExtendedCommand()

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

This command is like the GammaCorrectCommand method, but has been extended to allow the specification of the colorspace to be used.
Intensity values ideally follow a logarithmic progression, because the eye perceives changes in intensity as being equal when the ratio of change is equal. For example, we would see a change from 0.1 to 0.2 as being equal to a change from 0.2 to 0.4.
Gamma is a standard constant that is used to calculate the progression. For most CRTs the gamma constant is in the range of 2.2 to 2.5.
This command supports 12 and 16-bit grayscale and 48 and 64-bit color images. Support for 12 and 16-bit grayscale and 48 and 64-bit color images is available only in the Document/Medical toolkits.
This command does not support 32-bit grayscale images.

If the image has a LUT and you want to work on the image data, set RasterImage.UseLookupTable to false. Then, after calling the method, reset the UselookupTable property to true, as follows:

rasterImage.UseLookupTable = false; Method(rasterImage); rasterImage.UseLookupTable = true;

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

Copy Code

Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.ImageProcessing.Color

Public Sub GammaCorrectExtendedCommandExample()
   Dim codecs As New RasterCodecs()
   codecs.ThrowExceptionsOnInvalidImages = True

   Dim leadImage As RasterImage = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "Master.jpg"))

   ' Prepare the command
   Dim command As New GammaCorrectExtendedCommand

   ' Apply gamma effect on image using the YUV color space and gamma value of 2.50
   command.Gamma = 250
   command.Type = GammaCorrectExtendedCommandType.YuvSpace
   command.Run(leadImage)
   codecs.Save(leadImage, Path.Combine(LEAD_VARS.ImagesDir, "Result.jpg"), RasterImageFormat.Jpeg, 24)

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.Color;

public void GammaCorrectExtendedCommandExample()
{
   // Load an image
   RasterCodecs codecs = new RasterCodecs();
   codecs.ThrowExceptionsOnInvalidImages = true;

   RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "Master.jpg"));

   // Prepare the command
   GammaCorrectExtendedCommand command = new GammaCorrectExtendedCommand();

   // Apply gamma effect on image using the YUV color space and gamma value of 2.50
   command.Gamma = 250;
   command.Type = GammaCorrectExtendedCommandType.YuvSpace;
   command.Run(image);
   codecs.Save(image, Path.Combine(LEAD_VARS.ImagesDir, "Result.jpg"), RasterImageFormat.Jpeg, 24);

}

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

using Leadtools;
using Leadtools.Codecs;
using Leadtools.ImageProcessing.Color;

      
public async Task GammaCorrectExtendedCommandExample()
{
   // Load an image
   RasterCodecs codecs = new RasterCodecs();
   codecs.ThrowExceptionsOnInvalidImages = true;
   // Load the image
   string srcFileName = @"Assets\Image1.cmp";
   StorageFile loadFile = await Tools.AppInstallFolder.GetFileAsync(srcFileName);
   RasterImage image = await codecs.LoadAsync(LeadStreamFactory.Create(loadFile));

   // Prepare the command
   GammaCorrectExtendedCommand command = new GammaCorrectExtendedCommand();

   // Apply gamma effect on image using the YUV color space and gamma value of 2.50
   command.Gamma = 250;
   command.Type = GammaCorrectExtendedCommandType.YuvSpace;
   command.Run(image);

   string destFileName = @"result.jpg";
   StorageFile saveFile = await Tools.AppLocalFolder.CreateFileAsync(destFileName);
   await codecs.SaveAsync(image, LeadStreamFactory.Create(saveFile), RasterImageFormat.Jpeg, 0);
}

using Leadtools;
using Leadtools.Codecs;
using Leadtools.ImageProcessing.Color;
using Leadtools.Examples;

public void GammaCorrectExtendedCommandExample(RasterImage image, Stream outStream)
{
   // Prepare the command
   GammaCorrectExtendedCommand command = new GammaCorrectExtendedCommand();
   // Apply gamma effect on image using the YUV color space and gamma value of 2.50
   command.Gamma = 250;
   command.Type = GammaCorrectExtendedCommandType.YuvSpace;
   command.Run(image);

   // Save result image
   RasterCodecs codecs = new RasterCodecs();
   codecs.Save(image, outStream, RasterImageFormat.Jpeg, 24);
   image.Dispose();
}

Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.ImageProcessing.Color

Public Sub GammaCorrectExtendedCommandExample(ByVal image As RasterImage, ByVal outStream As Stream)
   ' Prepare the command
   Dim command As GammaCorrectExtendedCommand = New GammaCorrectExtendedCommand()
   ' Apply gamma effect on image using the YUV color space and gamma value of 2.50
   command.Gamma = 250
   command.Type = GammaCorrectExtendedCommandType.YuvSpace
   command.Run(image)

   ' Save result image
   Dim codecs As RasterCodecs = New RasterCodecs()
   codecs.Save(image, outStream, RasterImageFormat.Jpeg, 24)
   image.Dispose()
End Sub

Target Platforms

Reference