#include "ltwrappr.h"

virtual L_INT LBitmap::AntiAlias (uThreshold, uDim, uFilter, uFlags = 0)

L_UINT uThreshold;

threshold value

L_UINT uDim;

mask size

L_UINT uFilter;

anti-aliasing filter

L_UINT32 uFlags;


Applies an anti-aliasing filter to the class object's bitmap.




Threshold value that indicates which pixels to smooth. The application of the anti-aliasing filter on the image associates a value with each pixel. Only pixels with values above this threshold are smoothed.


Value that indicates the size of the anti-aliasing mask. For example, a value of three indicates an anti-aliasing mask of 3 X 3.


Flag that indicates the type of anti-aliasing filter to use. Possible values are:

  Value Meaning
  ANTIALIAS_1 [0x0000] Anti-alias the bitmap vertically and horizontally.
  ANTIALIAS_2 [0x0001] Anti-alias the bitmap in all directions.
  ANTIALIAS_3 [0x0002] Anti-alias the bitmap in all directions. The filter used for this option is different from the filter used for the ANTIALIAS_2 option.
  ANTIALIAS_DIAG [0x0003] Anti-alias the bitmap diagonally.
  ANTIALIAS_HORZ [0x0004] Anti-alias the bitmap horizontally.
  ANTIALIAS_VERT [0x0005] Anti-alias the bitmap vertically.
uFlags Reserved for future use. Must be 0.



The function was successful.

< 1

An error occurred. Refer to Return Codes.


The best results for anti-aliasing text can be obtained with the filter ANTIALIAS_2.

The value of the uDim parameter determines the extent of the anti-aliasing.

This function can process the whole image or a region of the image.

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.

The threshold range for 16, 48 and 64-bit bitmaps is from 0 to 65535 and for 12-bit bitmaps the threshold range is from 0 to 4095. Otherwise, it is from 0 to 255. The threshold is applied on channels separately.

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


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


Win32, x64.

See Also


LBitmap::AdjustTint. LBitmap::ColorHalfTone, LBitmap::AntiAlias2, Class Members


Correcting Colors


Raster Image Function: Filtering Images


Raster Image Functions: Correcting Colors


L_INT LBitmap__AntiAliasExample(LBitmap & Bitmap, L_TCHAR * szFile) 
   L_INT nRet; 
   nRet =Bitmap.Load(szFile); 
   if(nRet !=SUCCESS) 
      return nRet; 
   nRet =Bitmap.AntiAlias(128, 3, ANTIALIAS_1); 
   if(nRet !=SUCCESS) 
      return nRet; 
   return SUCCESS; 

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