Digitize graphs. Pull out data from points in a scatter plot
Digitizing Graph. I know a tool that can semi-automatically extract data, (scattered points and curves) from graph images within a few clicks. But it is not in Python.
It is PlotDigitizer.com. I have used the tool and based on my experience it is better than some others I have used earlier.
Here is a simple guide to use it:

Upload the image graph
Calibrate both axes graph - you have to do it manually
Pick the color of points or curves you want to extract
Select auto-extracting algorithms, e.g. points, curves

Done. You have extracted the data points.
You can find a more detailed guide on its website: plotdigitizer.com.