#include "ltwrappr.h"

virtual L_INT LBitmap::ColorIntensityBalance(pShadows, pMidTone, pHighLight, bLuminance, uFlags = 0)

Changes the distribution of the red, green, or blue channels.



Pointer to structure used to adjust the dark tones.


Pointer to structure used to adjust the medium tones (midtones).


Pointer to structure used to adjust the bright tones (highlights).

L_BOOL bLuminance

Value that indicates whether to preserve luminance. Possible values are:

Value Meaning
TRUE Preserve luminance.
FALSE Do not preserve luminance.

L_UINT32 uFlags

Reserved for future use. Must be 0.


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


This function changes the distribution of the red, green, or blue channels to make the colors in an image more accurate or more different.

Each color component is treated independently. The color range for each component is split into Shadows, Midtones and Highlights based on the intensity. The values in each range are adjusted differently using the BALANCEDATA structures. Positive values from BALANCEDATA for a component cause that particular component to become brighter, whereas negative values cause the component to become darker. A value of 0 leaves the component unchanged.

The preserve luminance option aims to minimize the luminance change in the image.

This function supports only RGB images. It does not support grayscale images.

Support for 48-bit and 64-bit colored images are available only in the Document/Medical toolkits.

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

This function does not support signed data images. It returns the error code ERROR_SIGNED_DATA_NOT_SUPPORTED if a signed data image is passed to this function.

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.

Required DLLs and Libraries


Win32, x64.

See Also




L_INT LBitmap__ColorIntensityBalanceExample(LBitmap *pLeadBitmap)  
   BALANCEDATA   Shadows;  
   BALANCEDATA   MidTone; 
   BALANCEDATA   HighLight;  
   Shadows.uStructSize  = sizeof(BALANCEDATA);  
   Shadows.nRed     = 60;  
   Shadows.nGreen = 0;  
   Shadows.nBlue  = 0;  
   MidTone.uStructSize  = sizeof(BALANCEDATA);  
   MidTone.nRed     = 40;  
   MidTone.nGreen = 0;  
   MidTone.nBlue  = 0;  
   HighLight.uStructSize = sizeof(BALANCEDATA);  
   HighLight.nRed       = 70;  
   HighLight.nGreen  = 0;  
   HighLight.nBlue   = 0;  
   /* Balance the colors by increasing the red channel values */ 
   return pLeadBitmap->ColorIntensityBalance(&Shadows, &MidTone, &HighLight, FALSE);  
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