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enu:   Processing > Filters… > Enhance > Clarify  
Script:   clarify  

Use this function to clarify an image by reducing noise without blurring objects of interest. The original image is compared pixel by pixel with the result of the lowpass filter. When the absolute difference between the intensities of related pixels exceeds the Offset, pixels from the lowpass Image are selected for the output image, otherwise pixels of the original image are selected.

If you choose this command, the following options will become available:

Displays the input image frame number. If you want to process another image, type or select the corresponding value.  

Displays the number of the frame in which the output image will be created. Depending on the Preferences. ImageWarp will set it either to the first available value or to the Input frame number. Type or select another value if you want the output image to be created in a different frame.  

Select this check box to watch the Preview of the output image.  
Lets you choose the size of the window for the lowpass filter. This value must not exceed 2*Overscan+1. See Preferences for more details.  

Lets you choose the threshold for the difference between the intensity of related pixels in the original and lowpass image. If this threshold is exceeded, the pixels from the original image will be replaced by the pixels from the lowpass image, provided the Invert option is not selected.  
Select this check box to invert the outcome of the Clarify function. Only those pixels whose intensities fall within the Offset range from the intensities of the lowpass image pixels, will be replaced by the pixels from the lowpass image.  

Also see Lowpass