Posted by
Swayne, Theresa C. on
Jun 19, 2017; 2:20pm
URL: http://imagej.273.s1.nabble.com/Calculating-distances-between-multiple-points-along-a-line-tp5018921p5018924.html
Dear Adrian,
I haven’t tried these particular methods, but here are 2 possibilities that came up in a quick search.
Luke Miller’s blog:
http://lukemiller.org/index.php/2011/09/digitizing-data-from-old-figures-with-imagej/From the archives of this list:
http://imagej.1557.x6.nabble.com/Extract-Data-From-a-Plot-td5017731.htmlRegarding Herbie’s comment, I agree that digitizing a plot doesn’t give you the most *precise* data. But I disagree that it’s somehow *unethical* to extract data from a published graph.
After all, when we look at a published graph we are allowed to mentally extract the data — we might even even pull out a ruler and pencil to get a better idea of the curve’s value at some point. Nothing seems wrong with that to me.
Of course, even better would be to ask the author for the source data. If the graph is in the scientific literature and not too old, many researchers would be willing to share an electronic version.
Hope this helps,
Theresa
On Jun 19, 2017, at 10:01 AM, Herbie <
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Good day Adrián,
the question arises where these graphs come from. If they are not from your own research, what must be expected, the question arises, whether you are authorized to use or manipulate them.
In general it is not a good idea to extract data from plots.
Regards
Herbie
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Am 19.06.17 um 15:29 schrieb Adrián Villalba:
Dear all,
I have a graph (line graph) and i want to know he exact at the y-axis of
all the points of the graph. I think of tracing manually a line over the
line-graph. Then trace another line among the basal line of the x-axis (the
zero in the y-axis) and then calculate the distance (in any unit, it does
not matter) between each point of the graph line and its parallel to the
basal line. It would give me the proportionality respect a reference point
to know each value of the graph line.
The fact is that when i try to do it on ImageJ, i can only do it manually
(which means a huge amount of time) do you know if there is any choice/tool
to perform this calculation along the line-graph?
Thank you all in advance
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