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Menu:   Processing > Filters… > Smooth > Median  
Script:   median  

Use this function to apply the median filter to an image. The median filter replaces the target pixel with the median value in its neighborhood. As a result, the impulse noise on an image gets reduced without degrading edges or intensity gradients. 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 select the size of the square kernel used for calculating the median. This value must not exceed 2*Overscan+1. See Preferences for more details.