Analyze Particles - documentation outdated?

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Analyze Particles - documentation outdated?

Jonas Binding
Hello everyone,

I'm using WCIF ImageJ 1.37c. I am trying to analyze images where I set
Image/Properties so that unit of length is "nm" and Pixel Height and Width
are 30. When I use the "Analyze Particles" function, the size is
interpreted in nm^2, even though it specifically claims to ask for pixel^2!
I.e. to exclude a particle which is four pixels large, I need to have a
lower size limit of over 4*30*30=3600, not 4! I assume this is a bug in the
documentation? Or am I doing something wrong?

Thanks in advance for your help,
Jonas


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Re: Analyze Particles - documentation outdated?

Gabriel Landini
On Wednesday 20 September 2006 13:02, Jonas Binding wrote:
> I'm using WCIF ImageJ 1.37c. I am trying to analyze images where I set
> Image/Properties so that unit of length is "nm" and Pixel Height and Width
> are 30. When I use the "Analyze Particles" function, the size is
> interpreted in nm^2, even though it specifically claims to ask for pixel^2!
> I.e. to exclude a particle which is four pixels large, I need to have a
> lower size limit of over 4*30*30=3600, not 4! I assume this is a bug in the
> documentation? Or am I doing something wrong?

Hi,
I am not sure that I understand what is the problem.
In my setup (1.37s, from the daily build) the units are displayed correctly in
the Analyze Particles dialog.

According to the Notes page ( http://rsb.info.nih.gov/ij/notes.html ), this
was implemented in v1.35e, so I imagine that it should be also OK in v1.37c.

Also the documentation pages
http://rsbweb.nih.gov/ij/docs/menus/analyze.html#ap
and
http://imagejdocu.tudor.lu/imagej-documenation-wiki/gui-commands/analyze-particles

(the latter was imported from the former) seem to be both fine (i.e. they do
not seem to specify "pixels" as units for filtering:

"Particles outside the range specified in the Size field are ignored. Enter a
single value in Size and particles smaller than that value are ignored. "

What is the bug?

Cheers,

Gabriel
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Re: Analyze Particles - documentation outdated?

Jonas Binding
Hello,

sorry, never mind - I can't reproduce my problem myself any more. I guess I
should have just gone home a couple of hours ago :-/.

Thanks for your time,

Jonas

ImageJ Interest Group <[hidden email]> wrote on 20.09.2006 16:18:51:

> On Wednesday 20 September 2006 13:02, Jonas Binding wrote:
> > I'm using WCIF ImageJ 1.37c. I am trying to analyze images where I set
> > Image/Properties so that unit of length is "nm" and Pixel Height and
Width
> > are 30. When I use the "Analyze Particles" function, the size is
> > interpreted in nm^2, even though it specifically claims to ask for
pixel^2!
> > I.e. to exclude a particle which is four pixels large, I need to have a
> > lower size limit of over 4*30*30=3600, not 4! I assume this is a bug in
the
> > documentation? Or am I doing something wrong?
>
> Hi,
> I am not sure that I understand what is the problem.
> In my setup (1.37s, from the daily build) the units are displayed
> correctly in
> the Analyze Particles dialog.
>
> According to the Notes page ( http://rsb.info.nih.gov/ij/notes.html ),
this
> was implemented in v1.35e, so I imagine that it should be also OK in
v1.37c.
>
> Also the documentation pages
> http://rsbweb.nih.gov/ij/docs/menus/analyze.html#ap
> and
> http://imagejdocu.tudor.lu/imagej-documenation-wiki/gui-
> commands/analyze-particles
>
> (the latter was imported from the former) seem to be both fine (i.e. they
do
> not seem to specify "pixels" as units for filtering:
>
> "Particles outside the range specified in the Size field are ignored.
Enter a
> single value in Size and particles smaller than that value are ignored. "
>
> What is the bug?
>
> Cheers,
>
> Gabriel


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