Re: Logical operation on ROIs

Posted by jmutterer on Jan 17, 2008; 7:24am
URL: http://imagej.273.s1.nabble.com/Logical-operation-on-ROIs-tp3697543p3697544.html

Zhengyu,

You can trace ROI1, then keep the shift key down and trace ROI2. Now invert
the selection using Edit/Selection/Make Inverse.
In a macro, use the setKeyDown('shift'); function.

Jerome


On Jan 17, 2008 4:00 AM, Pang, Zhengyu (GE, Research) <[hidden email]>
wrote:

> Could I perform logical operation on ROIs? For example, If I have
> specified ROI1 and ROI2, could I define
> ROI3=whole image-ROI1-ROI2?
> And then perform necessary measurement on ROI3.
>
> Do I need to install some plugins to do it?
>
> Thanks!
>
> Zhengyu
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