g3data
WebPlotDigitizer
DataThief III
im2graph
GraphClick
Silkscientific UN-SCAN-IT
Plot Digitizer
Software tool written in Java for digitizing data from an image of graph or plot.

Uploading local or remote images from CLI to store in Cloud. - egoist/image-cli
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| Website | code.google.com | github.com |
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When comparing jTechDig and imagecli, you can also consider the following products.
WebPlotDigitizer - Web based tool to extract numerical data from plots, images and maps.
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DataThief III is a program to extract (reverse engineer) data points from a graph.
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im2graph graph digitizing software to convert graphs to numbers
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GraphClick is a graph digitizer shareware for Mac OS X which allows to automatically retrieve the original (x,y)-data from the image of a scanned graphor fom QuickTime movies.
Compare GraphClick to jTechDig or imagecli:

Digitizing Software converts graph image files to usable (x,y) data automatically
Compare Silkscientific UN-SCAN-IT to jTechDig or imagecli: