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Menu:   Processing > Morphology… > Basic->Thickening  
Script:   thicken  
Use this command to grow bright objects from their skeletons. The function is complementary to the Thinning
operation. For multiphase images
it works by dilating the boundaries of objects while preserving their topology and keeping the objects separated from each other. For grayscale and true-color image the function dilates the areas around the intensity "ridges", thus increasing the width of bright lines in an image.

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

Displays the input image frame number. If you want to perform the operation on 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 number of thickening steps. If this option is set to zero, ImageWarp will continue to iterate until the objects are completely thickened.  
Allows you to chose the thinning method. Select among the following modes:  
Distance – fast non-iterative method based on the distance transform.  
Znang – parallel iterative method based on the modified Zhang-Suen transform.  
Davis – sequential iterative method based on the Davies-Plummer algorithm.