Channel Property

Summary

Gets or sets a flag that indicates the channel for which to get the histogram and the bits to use in calculating the histogram.

Syntax

Objective-C

C++

Java

public HistogramCommandFlags Channel { get; set; }

Public Property Channel As HistogramCommandFlags

@property (nonatomic, assign) LTHistogramCommandFlags channel

public int getChannel() 
public void setChannel(int value)

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

Property Value

Value that indicates the channel for which to get the histogram and the bits to use in calculating the histogram.

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

Refer to HistogramCommand.

Requirements

Target Platforms