LEADTOOLS Image Processing (Leadtools.ImageProcessing.Color assembly)

HistogramContrastCommand Class

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Example 







Members 
Increases or decreases the contrast of the image, using a histogram to determine the median brightness.
Object Model
Syntax
'Declaration
 
Public Class HistogramContrastCommand 
   Inherits Leadtools.ImageProcessing.RasterCommand
   Implements Leadtools.ImageProcessing.IRasterCommand 
'Usage
 
Dim instance As HistogramContrastCommand
public sealed class HistogramContrastCommand : Leadtools.ImageProcessing.IRasterCommand  
@interface LTHistogramContrastCommand : LTRasterCommand
public class HistogramContrastCommand extends RasterCommand
function Leadtools.ImageProcessing.Color.HistogramContrastCommand()
public ref class HistogramContrastCommand : public Leadtools.ImageProcessing.RasterCommand, Leadtools.ImageProcessing.IRasterCommand  
Remarks

For more information, refer to Changing Brightness and Contrast.

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;
Example
Copy Code  
Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.ImageProcessing.Color

Public Sub HistogramContrastCommandExample()
   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 HistogramContrastCommand = New HistogramContrastCommand
   'Increase the contrast using the histogram by 25 percent of the possible range.
   command.Contrast = 250

   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 HistogramContrastCommandExample()
{
   // Load an image
   RasterCodecs codecs = new RasterCodecs();
   codecs.ThrowExceptionsOnInvalidImages = true;

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

   // Prepare the command
   HistogramContrastCommand command = new HistogramContrastCommand();
   //Increase the contrast using the histogram by 25 percent of the possible range.
   command.Contrast = 250;
   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 HistogramContrastCommandExample()
{
   // 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
   HistogramContrastCommand command = new HistogramContrastCommand();
   //Increase the contrast using the histogram by 25 percent of the possible range.
   command.Contrast = 250;
   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 HistogramContrastCommandExample(RasterImage image, Stream outStream)
{
   // Prepare the command
   HistogramContrastCommand command = new HistogramContrastCommand();
   //Increase the contrast using the histogram by 25 percent of the possible range.
   command.Contrast = 250;
   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 HistogramContrastCommandExample(ByVal image As RasterImage, ByVal outStream As Stream)
   ' Prepare the command
   Dim command As HistogramContrastCommand = New HistogramContrastCommand()
   'Increase the contrast using the histogram by 25 percent of the possible range.
   command.Contrast = 250
   command.Run(image)
   ' Save result image
   Dim codecs As RasterCodecs = New RasterCodecs()
   codecs.Save(image, outStream, RasterImageFormat.Jpeg, 24)
   image.Dispose()
End Sub
Requirements

Target Platforms

See Also

Reference

HistogramContrastCommand Members
Leadtools.ImageProcessing.Color Namespace
Changing Brightness and Contrast
ChangeIntensityCommand Class
GammaCorrectCommand Class
ChangeContrastCommand Class
StretchIntensityCommand Class
RemapIntensityCommand Class
InvertCommand Class
ChangeHueCommand Class
ChangeSaturationCommand Class
HistogramEqualizeCommand Class
Leadtools.ImageProcessing.FillCommand
HistogramCommand Class
Leadtools.ImageProcessing.Core.WindowLevelCommand
ChannelMixerCommand Class
Leadtools.ImageProcessing.Effects.DeinterlaceCommand
DesaturateCommand Class
Leadtools.ImageProcessing.Effects.EdgeDetectStatisticalCommand
LightControlCommand Class
Leadtools.ImageProcessing.Effects.SmoothEdgesCommand
LocalHistogramEqualizeCommand Class
AddWeightedCommand Class
ColorMergeCommand Class
ColorSeparateCommand Class
MultiplyCommand Class
AutoColorLevelCommand Class
ColorLevelCommand Class
Leadtools.ImageProcessing.Core.CorrelationListCommand
GrayScaleToDuotoneCommand Class
GrayScaleToMultitoneCommand Class
Leadtools.ImageProcessing.Core.HolePunchRemoveCommand
SelectiveColorCommand Class
Leadtools.ImageProcessing.Effects.SkeletonCommand
ChangeHueSaturationIntensityCommand Class
ColorReplaceCommand Class
ColorThresholdCommand Class
MathematicalFunctionCommand Class
SegmentCommand Class
AdaptiveContrastCommand Class
ApplyMathematicalLogicCommand Class
ColorIntensityBalanceCommand Class
Leadtools.ImageProcessing.Core.ColorizeGrayCommand
ContrastBrightnessIntensityCommand Class
Leadtools.ImageProcessing.Core.DigitalSubtractCommand
DynamicBinaryCommand Class
Leadtools.ImageProcessing.Effects.EdgeDetectEffectCommand
Leadtools.ImageProcessing.SpecialEffects.FunctionalLightCommand
Leadtools.ImageProcessing.Core.MultiscaleEnhancementCommand
Leadtools.ImageProcessing.Core.SelectDataCommand
Leadtools.ImageProcessing.Core.ShiftDataCommand
AdjustTintCommand Class
GammaCorrectCommand Class

 

 


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