Create rectangle with known size

[rettl]

Hi!

Probably an old topic, but I can't find it...

I have different images (all with scale bar on) and I want to create a rectangle on all of them which has the same size in mm (and then crop this region). Although the magnification is not always 100% the same, I want the macro to create a rectangle with the size of 20x30mm. I know how to set scale, but I can't find a solution for "creating a rectangle in a known size".

I am sure this is very easy. Thanks for your ideas!

CL

[Saalfeld, Stephan]

Edit > Selection > Specify...

Cheers,
Stephan



On Mon, 2015-07-06 at 05:48 -0700, rettl wrote:

> Hi!
>
> Probably an old topic, but I can't find it...
>
> I have different images (all with scale bar on) and I want to create a
> rectangle on all of them which has the same size in mm (and then crop this
> region). Although the magnification is not always 100% the same, I want the
> macro to create a rectangle with the size of 20x30mm. I know how to set
> scale, but I can't find a solution for "creating a rectangle in a known
> size".
>
> I am sure this is very easy. Thanks for your ideas!
>
> CL
>
>
>
> --
> View this message in context: http://imagej.1557.x6.nabble.com/Create-rectangle-with-known-size-tp5013429.html
> Sent from the ImageJ mailing list archive at Nabble.com.
>
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[rettl]

That's it! :)
Thank you so much!!!

[BenS]

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[rettl]

Hi Ben,

I am sorry but since I have a new job I don't have access to the old macros any more...

All the best.

2016-11-09 16:55 GMT+01:00 BenS [via ImageJ] <[hidden email]>:

Hi rettl,

I'm facing the same problem as you did, however, I could not integrate it into my macro yet. Would you mind sharing your macro?

Many thanks,

Ben

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[Michael Schmid]

Hi Christoph, Ben,

for scaled images, the Edit>Selection>Specify command supports also
scaled coordinates. Use Plugins>Macros>Record to see how to create a macro.

E.g., if your image is calibrated in cm, you can have

   run("Specify...", "width=2 height=3 x=1 y=1 scaled");

to create a selection 2x3 cm, with its origin at 1 cm in x and y.
You can specify the center of the selection instead of the origin if you
add the 'centered' keyword.

Michael

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[Stefan Helfrich-2]

Hi Ben,

you should be able to do the following:

     widthInMM = 100;
     heightInMM = 200;

     widthInPixel = toUnscaled(widthInMM);
     heightInPixel = toUnscaled(heightInMM);

     run("Specify...", "width="+widthInPixel+" height="+heightInPixel+"
x=128 y=70");

You can do a similar thing with toUnscaled(xInMM, yInMM) for the x- and
y-coordinates.

Hope that helps,

Stefan


On 11/10/2016 10:00 AM, rettl wrote:

> Hi Ben,
> I am sorry but since I have a new job I don't have access to the old macros
> any more...
> All the best.
>
> 2016-11-09 16:55 GMT+01:00 BenS [via ImageJ] <
> [hidden email]>:
>
>> Hi rettl,
>>
>> I'm facing the same problem as you did, however, I could not integrate it
>> into my macro yet. Would you mind sharing your macro?
>>
>> Many thanks,
>>
>> Ben
>>
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>> below:
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>> known-size-tp5013429p5017545.html
>> To unsubscribe from Create rectangle with known size, click here
>> <
>> .
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>

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Dr. Stefan Helfrich
Bioimaging Center (L931)
University of Konstanz

PO Box 604
78457 Konstanz
Germany

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