Threshold Property (ShadowCommand)

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public int Threshold {get; set;}

'Declaration Public Property Threshold As Integer

'Usage Dim instance As ShadowCommand Dim value As Integer instance.Threshold = value value = instance.Threshold

public int Threshold {get; set;}

get_Threshold();
set_Threshold(value);
Object.defineProperty('Threshold');

public: property int Threshold { int get(); void set ( int value); }

Property Value

Threshold value used to determine which pixels will be affected. Valid values range from 0 through 255. When Type = ShadowCommandType.ColoredShadow, any component (R, G, or B) of a pixel with a value less than the Threshold value is not affected. When Type = ShadowCommandType.GrayShadow, any pixel where the master channel value is less than the Threshold value is not affected.

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))

Refer to ShadowCommand.

Target Platforms

Reference

ShadowCommand Class
ShadowCommand Members