#include "ltwrappr.h"

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

L_UINT uRadius;

radius of the neighborhood

L_UINT uOpacity;


L_UINT32 uFlags;


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




Value greater than 0 that indicates the radius of the neighborhood on which the filter is applied, in pixels.


Value that represents the intensity of the effect. The valid range is from 0 to 100. At 100, only the object outlines remain.


Reserved for future use. Must be 0.



The function was successful.

< 1

An error occurred. Refer to Return Codes.


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


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.

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