Using ImageJ to extract plot data

[Aaron Hendrickson]

Hello ImageJer's

I am trying to extract data from a plot that is in a tiff format.  I have
attached a compressed version of the plot for all to see.  The image is
cropped such that the bottom left pixel marks the origin, and the x and y
axes range from 640nm-664nm and (-35)dbm-(-5)dbm; respectively. I was
hoping to be able to set the scale of the image under the analyze>set scale
such that the coordinates of the mouse would represent the values of the
plots corrdinates.  I was able to do this easily for on axis but cannot
seem to figure out how to do it for both.  I tried messing with the aspect
ratio as well but didnt know if that was what I needed to do.  Any help
would be great.

Thanks!
Aaron

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ImageJ mailing list: http://imagej.nih.gov/ij/list.html

[Ion Andronache]

Dear Aaron,
You can use ImageJ plugin: Figure_Calibration. You can download it  here:http://www.astro.physik.uni-goettingen.de/~hessman/ImageJ/Figure_Calibration/Figure_Calibration.class
How to use is here:
http://lukemiller.org/index.php/2011/09/digitizing-data-from-old-figures-with-imagej/
Best wishes,
Ion.

________________________________________________________________
Best wishes,
Ion C. Andronache, PhD
Associate member, Research Centre for Integrated Analysis and Territorial Management, Faculty of Geography, University of Bucharest
Tehnical Redactor at Journal of Wetland Biodiversity
https://www.researchgate.net/profile/Ion_Andronache3/






11.02.2015, 14:47, "Aaron Hendrickson" <[hidden email]>:

> Hello ImageJer's
>
> I am trying to extract data from a plot that is in a tiff format.  I have
> attached a compressed version of the plot for all to see.  The image is
> cropped such that the bottom left pixel marks the origin, and the x and y
> axes range from 640nm-664nm and (-35)dbm-(-5)dbm; respectively. I was
> hoping to be able to set the scale of the image under the analyze>set scale
> such that the coordinates of the mouse would represent the values of the
> plots corrdinates.  I was able to do this easily for on axis but cannot
> seem to figure out how to do it for both.  I tried messing with the aspect
> ratio as well but didnt know if that was what I needed to do.  Any help
> would be great.
>
> Thanks!
> Aaron
>
> --
> ImageJ mailing list: http://imagej.nih.gov/ij/list.html

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ImageJ mailing list: http://imagej.nih.gov/ij/list.html

[Aaron Hendrickson]

Ion,

This is great! Thank you.

-Aaron

On Wed, Feb 11, 2015 at 7:55 AM, Ion C. Andronache <[hidden email]>
wrote:

> Dear Aaron,
> You can use ImageJ plugin: Figure_Calibration. You can download it  here:
> http://www.astro.physik.uni-goettingen.de/~hessman/ImageJ/Figure_Calibration/Figure_Calibration.class
> How to use is here:
>
> http://lukemiller.org/index.php/2011/09/digitizing-data-from-old-figures-with-imagej/
> Best wishes,
> Ion.
>
> ________________________________________________________________
> Best wishes,
> Ion C. Andronache, PhD
> Associate member, Research Centre for Integrated Analysis and Territorial
> Management, Faculty of Geography, University of Bucharest
> Tehnical Redactor at Journal of Wetland Biodiversity
> https://www.researchgate.net/profile/Ion_Andronache3/
>
>
>
>
>
>
> 11.02.2015, 14:47, "Aaron Hendrickson" <[hidden email]>:
> > Hello ImageJer's
> >
> > I am trying to extract data from a plot that is in a tiff format.  I have
> > attached a compressed version of the plot for all to see.  The image is
> > cropped such that the bottom left pixel marks the origin, and the x and y
> > axes range from 640nm-664nm and (-35)dbm-(-5)dbm; respectively. I was
> > hoping to be able to set the scale of the image under the analyze>set
> scale
> > such that the coordinates of the mouse would represent the values of the
> > plots corrdinates.  I was able to do this easily for on axis but cannot
> > seem to figure out how to do it for both.  I tried messing with the
> aspect
> > ratio as well but didnt know if that was what I needed to do.  Any help
> > would be great.
> >
> > Thanks!
> > Aaron
> >
> > --
> > ImageJ mailing list: http://imagej.nih.gov/ij/list.html
>
> --
> ImageJ mailing list: http://imagej.nih.gov/ij/list.html
>

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