Re: White particles

Posted by Gabriel Landini on May 21, 2008; 4:35pm
URL: http://imagej.273.s1.nabble.com/White-particles-tp3696155p3696157.html

On Wednesday 21 May 2008 16:35:40 Simon Roussel wrote:
> I do not observe that the autothreshold on binary images always selects
> black areas. If I invert such a binary image I can get the white areas as
> selected with autothreshold .

Ah, yes, you are right, sorry, I was convinced that this was hard wired to the
algorithm... I have an Otsu threhsold plugin where I have set what to
threshold (white things), and thererfore my confusion.

> So, I still would find logical that, if binary operations can consider
> objects as white (=255), analyse particles should also be able to have the
> same definition of "objects".

Yes, but ideally this should be defined elsewhere globally so all the other
operations follow that convention. Note that this gets more confusing when
one uses the Inverted LUT.

By the way, I wonder if this is a bug. If I enlarge/resize an image canvas,
the option that says Zero fill, fills with black, regardless of the check
status, if I have the foreground as white and the background as black in the
colour picker.
 
Regards,

G