ApplyMathematicalLogicCommandFlags Enumeration

Summary

Enumeration flags that identify the channel that will be used, the treatment of the input pixel values, the mathematical operation, and the treatment of the output pixel values.

Syntax

Objective-C

C++

Java

[FlagsAttribute()] 
public enum ApplyMathematicalLogicCommandFlags

<FlagsAttribute()> 
Public Enum ApplyMathematicalLogicCommandFlags

typedef NS_OPTIONS(NSUInteger, LTApplyMathematicalLogicCommandFlags)

public enum ApplyMathematicalLogicCommandFlags

[FlagsAttribute()] 
public enum class ApplyMathematicalLogicCommandFlags

Members

Value	Member	Description
0x00000000	Master	All channels.
0x00000000	ValueDoNothing	No change.
0x00000000	OperationAnd	Combine each pixel component value and the Factor property using a bitwise AND (&). (pixel = pixel & Factor)
0x00000000	ResultDoNothing	No change.
0x00000001	Red	Red channel only.
0x00000002	Green	Green channel only.
0x00000003	Blue	Blue channel only.
0x00000010	ValueNot	Invert the color, resulting in its complement.
0x00000020	ValueZero	Change all bits to 0.
0x00000030	ValueOne	Change all bits to 1.
0x00000100	OperationOr	Combine each pixel component value and the Factor property using a bitwise OR ( ¦ ). (pixel = pixel \| Factor)
0x00000200	OperationXor	Combine each pixel component value and the Factor property using a bitwise XOR (^). (pixel = pixel ^ Factor)
0x00000300	OperationAdd	Add pixel component value to the Factor property, clamping the result to the maximum allowed pixel value. (pixel = min(pixel + Factor, MaximumPixelValue) )
0x00000400	OperationSubtractFactor	Subtract each pixel component value from the Factor property, clamping the result to the allowed pixel range. (pixel = min(max(Factor - pixel, MinimumPixelValue), MaximumPixelValue) )
0x00000500	OperationSubtractValue	Subtract the Factor property from each pixel component value, clamping the result to the allowed pixel range. (pixel = min(max(pixel - Factor), MinimumPixelValue, MaximumPixelValue) )
0x00000600	OperationAbsoluteDifference	Calculate the Absolute difference between the Factor property and each pixel component value. (pixel = abs(pixel - Factor))
0x00000700	OperationMultiply	Multiply each pixel component value by Factor/100. (pixel = pixel * Factor / 100)
0x00000800	OperationDivisionByFactor	Divide each pixel component value by Factor/100. An error will be returned if Factor = 0. (pixel = pixel * 100 / Factor)
0x00000900	OperationDivisionByValue	Divide the Factor property by each pixel value. If the pixel value is 0, the result is set to the maximum allowed pixel value. (pixel = pixel ? min(Factor / pixel, MaximumPixelValue) : MaximumPixelValue)
0x00000A00	OperationAverage	Use the average of the each pixel component value and the Factor property. (pixel = (pixel+Factor) / 2).
0x00000B00	OperationMinimum	Use the lesser of the pixel component values and the Factor property. (pixel = min(pixel, Factor) )
0x00000C00	OperationMaximum	Use the greater of the pixel component values and the Factor property. (pixel = max(pixel, Factor) )
0x00001000	ResultNot	Invert the color, resulting in its complement.
0x00002000	ResultZero	Change all bits to 0.
0x00003000	ResultOne	Change all bits to 1.

Remarks

These flags have a FlagsAttribute attribute that allows a bitwise combination of its member values. You can use a bitwise OR ( ¦ ) to specify one flag from each group.

Group	Flags
Flags that indicate the channel that will be used	Master, Red, Green, Blue
Flags that indicate how to treat the color value	ValueDoNothing, ValueNot, ValueZero, ValueOne
Flags that indicate the mathematical operation to use	OperationAnd, ValueNot, ValueZero, ValueOne, OperationAnd, OperationOr, OperationXor, OperationAdd, OperationSubtractFactor, OperationSubtractValue, OperationAbsoluteDifference, OperationMultiply, OperationDivisionByFactor, OperationDivisionByValue, OperationAverage, OperationMinimum, OperationMaximum
Flags that indicate how to treat the output value	ResultDoNothing, ResultNot, ResultZero, ResultOne

The way MinimumPixelValue and MaximumPixelValue are calculated depends on the bits per pixel and whether the image is signed or unsigned:
- if the image is unsigned (most common):
  - MaximumPixelValue will be : 255 (8-bit), 4095 (12-bit) or 65535 (16-bit)
  - MinimumPixelValue = 0
- if the image is signed (rare case):
  - MaximumPixelValue will be : 127 (8-bit), 2047 (12-bit) or 32767 (16-bit)
  - MinimumPixelValue will be -128 (8-bit), -2048 (12-bit) or -32768 (16-bit)
If the Flags property is set to OperationAnd, OperationOr, OperationXor, OperationAdd, OperationMultiply, OperationMaximum, OperationMinimum, OperationDivisionByValue, or OperationSubtractValue, the valid range of the Factor property is from MinimumPixelValue to MaximumPixelValue.
If the Flags property is set to OperationSubtract, OperationDifference, or OperationAverage, the valid range of the Factor property is from 2 * MinimumPixelValue to 2 * MaximumPixelValue.

Calculating Master Channel Values

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))

Requirements

Target Platforms

Reference

Leadtools.ImageProcessing.Color Namespace

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Leadtools.ImageProcessing.Color Assembly

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Leadtools.ImageProcessing.Color Namespace

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