Doubts about the Particle Analyzer

Posted by Sidnei Paciornik on
URL: http://imagej.273.s1.nabble.com/Doubts-about-the-Particle-Analyzer-tp5003481.html

Dear colleagues,

I would like to start with a very basic doubt:
Given that ImageJ allows us to select particles to be formed by white
pixels on a black background, why is it that the "Show Masks" option in
"Analyze Particles" shows the particles black against a white background?

It seems very confusing to have a set of white particles, filter them by
size/shape, create a mask to see the result, and have black particles as a
result.

Am I missing something obvious?

Now for a second doubt:
When particles have holes "Show Masks" and "Overlay Masks" have different
behavior. "Overlay Masks" fills the holes with its default blue color,
regardless of the "Include Holes" option being clicked or not. "Show Masks"
correctly responds to the "Include Holes" option.

It there any reason for this difference?

Thank you for your patience.

Prof. Sidnei Paciornik
Grupo de Análise de Imagens e Microscopia Digital
DEMa <http://www.dema.puc-rio.br/> - Departamento de Engenharia de Materiais
PUC-Rio <http://www.puc-rio.br/>
Rua Marquês de São Vicente 225
Prédio Leme, Sala 501L
Gávea - Rio de Janeiro - RJ
22451-900 - Brasil
tel: [phone]

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