Posted by
Fred Damen on
Oct 13, 2020; 6:56pm
URL: http://imagej.273.s1.nabble.com/draw-ROIs-on-different-slices-tp5024033p5024044.html
Greetings Ping,
I assume that you are trying to create what I know as a map, i.e., a
separate dataset that is conceptually the same as the original with the
pixel values representing properties of the underlying pixel data -
intended to use as a color overlay of the original data/image. If this is
the case...
With the source dataset current and no rois present,
Image>Duplicate
Process>Math>Set... (either nan or 0 or don't do by choice).
Draw the roi on the source image then go to the map image and Ctrl-Shift-E.
With the map dataset current Process>Math>Set... to the desired number.
Repeat until happy.
Note:
1) Set the display range appropriately for the map dataset or you will not
detect your contrast.
2) The above works on a one roi on one slice at a time basis. I do not
know how to do a distinct roi on each slice in one shot basis; this would
be nice to know how to do.
If my suspicion about you intentions are correct you may want to look into:
https://imagej.net/Colorizer_OverlayEnjoy,
Fred
On Tue, October 13, 2020 9:30 am, Wang Ping wrote:
> Hi Kees,
>
> Thank you so much for your email,
> For the first question, would it be possible to save the ROIs (drawn on
> different slices) into a mask image volume, with the slice information
> matching the original image volume?
>
> For the second question, I meant to see if it is possible to assign a
> different label to different ROI, for example, I draw one ROI and label
> all the pixels inside with "1", and another ROI with all pixels labeled
> with "2", this way I can recognize different ROIs.
>
> Thanks again,
> Ping
>
> ________________________________
> ·¢¼þÈË: ImageJ Interest Group <
[hidden email]> ´ú±í Straatman, Kees
> (Dr.) <
[hidden email]>
> ·¢ËÍʱ¼ä: 2020Äê10ÔÂ13ÈÕ 16:23
> ÊÕ¼þÈË:
[hidden email] <
[hidden email]>
> Ö÷Ìâ: Re: draw ROIs on different slices
>
> Dear Ping,
>
> Check in the ROI Manager menu under More > Options if 'Associate "Show
> All" Rois with slices' is selected.
>
> I am not sure what you mean with your second question about label images.
>
> Best wishes
>
> Kees
>
>
> Dr Ir K.R. Straatman
> Advanced Imaging Facility
>
> University of Leicester
> www.le.ac.uk/advanced-imaging-facility<
http://www.le.ac.uk/advanced-imaging-facility<
http://www.le.ac.uk/advanced-imaging-facility<
http://www.le.ac.uk/advanced-imaging-facility>>
>
>
> ________________________________
> From: Wang Ping <
[hidden email]>
> Sent: 13 October 2020 03:48
> To:
[hidden email] <
[hidden email]>
> Subject: draw ROIs on different slices
>
> Hello everyone,
>
> I wondered if ImageJ is able to draw ROIs on different slices and it also
> remembers the slice information. Currently it does not seems that ImageJ
> include the slice# information, all the ROIs basically are overlapped.
> Also not sure if ImageJ is able to make label images.
>
> Thanks for any hints.
> Ping
>
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