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Am looking for a tool that will import a line graph (chart) image and convert the line into numerical data, either in a spreadsheet or a database. For example, given an image like this:

Line graph

It might prompt to find out what colour the line is (or the user clicks on part of it) and then it would do the rest, e.g. importing numbers into a column in an Excel workbook. Not too worried about it knowing the scale, just the changes - can easily rescale the data.

Does anyone know if such a tool already exists in any shape or form? If not, it's going down on my list of things to do if I ever have time...

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Just found one:

http://arohatgi.info/WebPlotDigitizer/app/

Does basically what I asked and exports the data to CSV. After watching the help video I've worked out how to use it and it's working great!

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