Posted by
Michael Schmid on
URL: http://imagej.273.s1.nabble.com/Selection-brush-tool-usage-tp5017711p5017723.html
Hi Matt,
according to my understanding, the selection brush is mainly meant as a
'repair selection' brush.
If there is no selection, it creates one.
If there is a selection:
If you start brushing outside the current selection, it is in 'remove
from selection' mode, and you can use it to remove a few pixels from the
margin of the selection (because the selection was a bit too large).
If you start inside the current selection, it adds to the selection,
e.g. if you want to extend the borders a bit.
You can force the behavior with the SHIFT (add) and ALT (subtract)
modifier keys.
I am not aware of a possibility to have the selection brush delete the
old selection and create a new one.
So you can create a selection, press 'b' and then deselect all
(shift-A). Then add a new brush point. For convenience, you could have
the 'add to overlay' and 'deselect' in a macro with a shortcut.
Alternatively, use the Overlay brush.
Michael
_______________________________________________________________________________
On 2016-12-08 10:15, PEARSON Matthew wrote:
> Hi all,
>
> I think i have cracked my problem with the selection brush and in fact
> realise i'd asked a similar question a couple of years ago but then
> didn't pursue the idea. I can now get the selection brush to create
> selections around the image but the work flow for doing this seems a
> little strange. These are the steps that work for me:
>
> 1.) Left click on the image to create a circular selection with the
> selection brush
> 2.) Left click again anywhere on the image but not on the circular
> selection
> 3.) Press the b key (adds the first selection to the overlay i believe)
> 4.) I can now left click and add another circular selection on the
> image
> 5.) Repeat above for all selections then
> 5.) Image>Overlay>To ROI Manager (adds all the overlays as separate
> roi's)
>
> I'm not sure why i have to do step 2.) before i press b. Its not a
> big deal but would be good if you could just left click on the next
> area, perhaps there is good reason for this.
>
> Thanks,
>
> Matt
>
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