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Menu:   Processing > Filters… > Edges->Laplace  
Script:   laplace  
Use this function to detect points, lines and edges and suppress regions of constant gradient by applying the Laplacian operator to an image. The Laplacian is an approximation to the linear second derivative of the intensity:


The approximation is done using a convolution kernel, which depends on the Type selected. If an overflow occurs, the result is clipped to the minimum or maximum pixel value for the given image type.

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 neighborhood type for the Laplacian operator. Select one of the following kernels:  
4-conn         8-conn       Isotrop     
laplace2 laplace3   laplace4