LBitmap::ApplyMathLogic

#include "ltwrappr.h"

virtual L_INT LBitmap::ApplyMathLogic(nFactor, uFlags)

L_INT nFactor;

operation factor

L_UINT uFlags;

flag

Performs specific mathematical or logical operations on the colors of a bitmap.

Parameter

Description

nFactor

Mathematical or logical operation factor.

uFlags

Flags that indicate the channel that will be used, the treatment of the input pixel values, the mathematical operation, and the treatment of the output pixel values. Use a bitwise OR ( | ) to specify one flag from each group. Refer to Flags for the LBitmap::ApplyMathLogic* Function for the list of flags.

Returns

SUCCESS

The function was successful.

< 1

An error occurred. Refer to Return Codes.

Comments

This function supports 12 and 16-bit grayscale and 48 and 64-bit color images. Support for 12 and 16-bit grayscale and 48 and 64-bit color images is available only in the Document/Medical toolkits.

This function does not support 32-bit grayscale images. It returns the error code ERROR_GRAY32_UNSUPPORTED if a 32-bit grayscale image is passed to this function.

To update a status bar or detect a user interrupt during execution of this function, refer to LBase::EnableStatusCallback.

*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))

Required DLLs and Libraries

LTIMGCLR

For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application.

Platforms

Win32, x64.

See Also

Functions:

LBitmap::AdjustTint. LBitmap::ColorHalfTone, LBitmapBase::Combine, LBitmap::ChangeIntensity, LBitmap::GammaCorrect, LBitmap::ChangeContrast, LBitmap::HistoContrast, LBitmap::StretchIntensity, LBitmap::RemapIntensity, LBitmap::ChangeHue, LBitmap::ChangeSaturation, LBitmap::HistoEqualize, LBitmapBase::Fill, LBitmapBase::GetPixelColor, LBitmapBase::PutPixelColor, LBitmap::GetHistogram, LBitmap::WindowLevel, LBitmap::WindowLevelExt

Topics:

Raster Image Functions: Modifying Intensity Values

 

Correcting Colors

 

Raster Image Functions: Correcting Colors

Example

L_INT LBitmap__ApplyMathLogicExample(LBitmap *pLeadBitmap) 
{ 
   /* This example multiplies the colors using a factor of 1.51 */ 
   /* Multiply the colors of the bitmap using a factor of 1.51 */ 
   return pLeadBitmap->ApplyMathLogic(151, AML_OP_MUL| CHANNEL_MASTER| AML_VALUE_NOP| AML_RES_NOP); 
}

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