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LBitmap::ChangeIntensity

Summary

Changes the intensity (brightness) of the image in the class object's bitmap.

Syntax

#include "ltwrappr.h"

virtual L_INT LBitmap::ChangeIntensity(nChange, uFlags = 0)

Parameters

L_INT nChange

Amount to change the intensity. The intensity ranges from -1000 to 1000. A positive value increases (or lightens) the brightness of the bitmap image. A negative values decreases (or darkens) the brightness of the bitmap image.

L_UINT32 uFlags

Reserved for future use. Must be 0.

Returns

Value	Meaning
SUCCESS	The function was successful.
< 1	An error occurred. Refer to Return Codes.

Comments

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

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.

When applying contrast, gamma, and intensity changes to a bitmap, LEAD applies the changes in the following order:

Contrast
Intensity
Gamma

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.

This function changes the brightness of image data. If the image has a LUT, the function will work on the LUT, not the image data. If the image has a LUT and you want to work on the image data, set the UseLUT Flag in the BITMAPHANDLE structure to FALSE. Then, after calling the function, reset the UseLUT flag to TRUE as follows:

myBitmap.EnableUseLUT(FALSE); 
myBitmap.ChangeIntensity(500); 
myBitmap.EnableUseLUT(TRUE);

Change Intensity Function - Before

Change Intensity Function - After

View additional platform support for this Change Intensity function.

Required DLLs and Libraries

LTDIS
LTFIL
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.

Example

L_INT LBitmap__ChangeIntensityExample() 
{ 
   L_INT nRet; 
   LBitmap m_Bitmap; 
    
   nRet =m_Bitmap.Load(MAKE_IMAGE_PATH(TEXT("ImageProcessingDemo\\Image1.jpg")), 0,ORDER_BGR); 
   if(nRet !=SUCCESS) 
      return nRet; 
   // Increase the intensity 
   nRet =m_Bitmap.ChangeIntensity(500); 
   if(nRet !=SUCCESS) 
      return nRet; 
 
   return SUCCESS; 
}