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Menu:   Processing > Morphology… > Connectivity->Identify  
Script:   identify  
Use this function to identify (label) objects in a binary image
. The function works by assigning a unique index value to pixels belonging to the same connected group of pixels. The indexes are assigned sequentially from top to bottom, left to right. Two types of neighborhood can be selected for the operation.

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 for connectivity analysis.  
Select 4-connect to use the "city block" neighborhood. The pixels connected diagonally will be considered belonging to different objects.  
Select 8 connect to use the "chess board' neighborhood. Any interconnected pixels will be considered belonging to the same object.  
Select this check box to create an output image of the multiphase type. If this box is unchecked, a grayscale 16-bit image will be created instead. Selecting a multiphase output image makes an identified image visually perceptible due to steep color differences between adjacent levels, but such a mode will use only 8 byte for objects' IDs, restricting their possible values to a range of 1-255.