Posted by
Jan Eglinger on
Jul 25, 2014; 3:45pm
URL: http://imagej.273.s1.nabble.com/ROI-Editing-tp5008898p5008900.html
Hi Daniel,
On 25.07.2014, 5:00 PM, J. Daniel Fenn wrote:
> I feel like this should be obvious, but I must be blind. How do I
> edit an ROI once it is created?
you have three options to edit the selection:
- Use the *Selection Brush Tool* [1] that you activate via the
right-click menu on the Oval selection tool. You can add to your
selection with *Shift*, and subtract from it by pressing *Alt*.
- When editing the mask (i.e. the binary, black-and-white image), you
can use the Brush Tool [2] with black or white color and then create the
selection using 'Edit > Selection > Create Selection'.
- Store your selection in the ROI manager (by pressing 't')[3]. Then
create a new selection with what you want to subtract, store it, select
both ROIs in the manager and use 'More >> XOR' in the ROI manager
window. (This however only works if the part you want to subtract is
entirely within your original selection. I just listed this option for
completeness.)
Hope this helps,
Jan
[1]:
http://imagej.nih.gov/ij/docs/guide/146-19.html#sub:Brush-Selection-Tool[2]:
http://imagej.nih.gov/ij/docs/guide/146-19.html#sub:Brush[3]:
http://imagej.nih.gov/ij/docs/guide/146-30.html#sub:ROI-Manager...
On 25.07.2014, 5:00 PM, J. Daniel Fenn wrote:
> I feel like this should be obvious, but I must be blind. How do I edit
> an ROI once it is created?
>
> For example. If I make a selection mask, and add it as an ROI after
> doing an image threshold. There are parts of the selection I would like
> to manually edit out. I can't figure out how to do that, and I clearly
> can't come up with a good search phrase to find an answer.
>
> Can someone give me a push in the right direction?
>
> I kind of want to circle an area of the selection and "subtract" it away
> from the original selection. Kind of like one would do in photoshop
> selections.
>
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