Connectivity used in "Analyze Particle ..." and "Wand (tracing) Tool"

Posted by karo03 on
URL: http://imagej.273.s1.nabble.com/Delaunay-update-tp3694375p3694376.html

Hi, Image analysis and -J experts,

I have an example were I don't fully understand the routines "Analyze  
Particle ..." and "Wand (tracing) Tool"!

The image http://picasaweb.google.com/lh/photo/8Yo_5vJ1zLKZGwP22oDgsw 
delivers under "Analyze Particle ..." three particles (white is  
foreground). That is understandable, seemingly eight-connected  
neighborhood (of foreground) is assumed. Possibly four-connectedness  
could be helpful in such cases with thin lines dividing the particles.

But now, trying to overcome this problem by selecting the particles  
with "Wand (tracing) Tool", possibly in a macro, I run into  
difficulties. Clicking into particles on the left side of the image  
selection is okay, Wand is using 4-connectedness! Clicking into one of  
the two right-most particles seemingly wand is selecting background!

Is there any way to select one of these two right-most particles?

Help is appreciated
Regards
Karsten