LBitmap::HighPassFilter

#include "ltwrappr.h"

L_INT LBitmap::HighPassFilter(uRadius, uOpacity, uFlags = 0)

Removes low frequency details in a bitmap, resulting in a sharpened image.

Returns

Comments

This filter removes low-frequency detail in the bitmap. The effect is opposite to that of the Gaussian Blur filter (LBitmap::GaussianFilter).

To increase the thickness of the edges, increase the value of uRadius. Usually a low value for uRadius is better.

Unlike the LBitmap::UnsharpMask function, when using this function image noise is not increased.

For an example, click here

If the bitmap has a region, the effect will be applied on the region only.

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.

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

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

See Also

Example

L_INT LBitmap__HighPassFilterExample()
{
   L_INT nRet;
   LBitmap LeadBitmap;
   nRet =LeadBitmap.Load(TEXT("%UserProfile%\\My Documents\\LEADTOOLS Images\\IMAGE4.CMP"), 0,ORDER_BGR);
   if(nRet !=SUCCESS)
      return nRet;
   nRet =LeadBitmap.HighPassFilter(10, 100);
   if(nRet !=SUCCESS)
      return nRet;
   return SUCCESS;
}