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Digitizing Graphs & Plots


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I'm using two open-source apps to digitize the data from plots and graphs. The number of digitized points is not as much as I want and it is kinda manual to do the whole process.

Does anyone know of a decent software to do the job automatically?

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Just a question, but what is your source for these plots and graphs? It seems to me you're trying to get the original data from a graph to then use or re-work, but that's rarely an effective or accurate method.

You might have more luck trying to contact the corresponding author (if these are published) to get the actual original data.

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Good question. I'm developing mathematical models. To test my models, I just need some crude data for quick verification. I scan the scientific papers for such data.

When I get good primary results, I contact the author for the original data and maybe putting something together for publishing.

Don't worry, no frauds here.

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Haha, I hadn't even considered fraud. I just know how hard it is to get any useful and exact data from graphs.

Sadly, I have nothing else to add- manually digitizing is the only way I know to get a graphic (I'm assuming these are from PDFs) into any sort of data format. The graphic itself really doesn't distinguish the line as a separate item, so most computational-based methods would have a problem breaking it into cohesive data points.

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  • 8 years later...

Hi folks,


If anyone is interested, we have launched a free graph digitizer.  You can use it to extract 1000's of points on a spectral curve in seconds.  Give it a try and let me know what you think.



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