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This question already has an answer here:

I'm trying to compare my model results with an experiment. I want to overlap the model curve with experiment curve from a paper.

What are my options for digitizing the graph from an image in the pdf paper to excel data?

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marked as duplicate by Glen_b, gung, Nick Stauner, chl Apr 23 '14 at 6:16

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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    $\begingroup$ You could also try to reproduce the graph/results from the paper in question by obtaining the original data. $\endgroup$ – bdeonovic Apr 22 '14 at 19:30
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A google search for "digitize graph" brings up several potential solutions.

What is best depends on what tools you are already familiar with and what level of automation vs. fine control that you want. I personally would load the graph into R then use the updateusr function in the TeachingDemos package along with the locator function to find the coordinates of points, but others may prefer other workflows.

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I tried to post this as a comment, but it was much too long (because it has lots of links).

I'll try to make it a little more post-like than the comment was.

Some links (several R related, but a number of other tools are in the list):
Digitizing plots
Digitizing jpeg graphs
Converting plots to data (i)
Converting plots to data (ii)
Getting data from figures in published papers
Digitize graphs with multiple point sets
Digitizing data from old plots
How to digitize plots
Wikipedia: Converting scanned graphs to data

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