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LBitmap::Invert

Summary

Inverts the colors in the class object's bitmap, making it like a photographic negative.

Syntax

#include "ltwrappr.h"

virtual L_INT LBitmap::Invert(uFlags = 0)

Parameters

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

This function can also be used to invert the color of a 1-bit image, making the black white and the white black.

This function originally works on the image source data, but if the image has a LUT, the function will work on the LUT.

To use this function with source data for an image that has LUT:

Set the LBitmapBase::EnableUseLUT to FALSE.
Call this function.

After applying the function, set the LBitmapBase::EnableUseLUT back to TRUE.

myBitmap.EnableUseLUT(FALSE); 
myBitmap.Invert(); 
myBitmap.EnableUseLUT(TRUE);

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.

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.

Invert Function - Before

Invert Function - After

View additional platform support for this Invert 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__InvertExample() 
{ 
   L_INT nRet; 
   LBitmap LeadBitmap; 
 
   nRet =LeadBitmap.Load(MAKE_IMAGE_PATH(TEXT("image1.cmp")), 0,ORDER_BGR); 
   if(nRet !=SUCCESS) 
      return nRet; 
 
   nRet =LeadBitmap.Invert(); 
   if(nRet !=SUCCESS) 
      return nRet; 
 
   return SUCCESS; 
}