Channel Property

Summary

Gets or sets the channel for which to get the information.

Syntax

Objective-C

C++/CLI

Java

Python

public RasterColorChannel Channel { get; set; }

@property (nonatomic, assign) LTRasterColorChannel channel;

public RasterColorChannel getChannel(); 
public void setChannel( 
   RasterColorChannel rasterColorChannel 
);

public: 
property RasterColorChannel Channel { 
   RasterColorChannel get(); 
   void set (    RasterColorChannel ); 
}

Channel # get and set (StatisticsInformationCommand)

Property Value

The channel for which to get the information. This value is ignored if the image is 12 or 16-bit grayscale.

Remarks

In order to speed up widely used image processing filters in LEADTOOLS, the grayscale value (master channel) of a colored image is calculated using the following formulas:

#define CalcGrayValue(r, g, b) ((L_UCHAR)(((L_UCHAR) (((2 * (L_UINT) (r)) + (5 * (L_UINT) (g)) + (L_UINT) (b) + 4) / 8)))) 
#define CalcGrayValue16(r, g, b) ((L_UINT16) (((2 * (L_UINT32) (r)) + (5 * (L_UINT32) (g)) + (L_UINT32) (b) + 4) / 8)) 
#define CalcGrayValue32(r, g, b) ((L_UINT32) (((2 * (L_UINT32) (r)) + (5 * (L_UINT32) (g)) + (L_UINT32) (b) + 4) / 8))

Example

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing; 
using Leadtools.ImageProcessing.Effects; 
 
 
public void StatisticsInformationCommandExample() 
{ 
   // Load an image 
   RasterCodecs codecs = new RasterCodecs(); 
   codecs.ThrowExceptionsOnInvalidImages = true; 
 
   RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "Master.jpg")); 
 
   // Prepare the command 
   StatisticsInformationCommand command = new StatisticsInformationCommand(); 
   command.Channel = RasterColorChannel.Master; 
   command.Start = 0; 
   command.End = 255; 
   //Get statistical image information. 
   command.Run(image); 
   MessageBox.Show("Minimum = " + command.Minimum + "\n" + 
      "Maximum = " + command.Maximum + "\n" + 
      "Mean = " + command.Mean + "\n" + 
      "Median = " + command.Median + "\n" + 
      "Percent = " + command.Percent + "\n" + 
      "PixelCount = " + command.PixelCount + "\n" + 
      "StandardDeviation = " + command.StandardDeviation + "\n" + 
      "TotalPixelCount = " + command.TotalPixelCount); 
 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS22\Resources\Images"; 
}

Requirements

Target Platforms

Reference

StatisticsInformationCommand Class

StatisticsInformationCommand Members

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Help Version 22.0.2023.3.31

Leadtools.ImageProcessing.Effects Assembly

Introduction

Getting Started

Namespaces

Leadtools.ImageProcessing.Effects Namespace

Assemblies