Some other ways are described here and here. Probably the simplest way is to use free QPDF utility with -stream-data=uncompress option: qpdf infile.pdf -stream-data=uncompress - outfile.pdf There are several ways to uncompress data streams in order to convert PDF file to a textual document with readable PDF code. These compressed data streams usually contain the information we need. The problem is that it can (and almost always) contain compressed data streams which require to be uncompressed in order to read them by a text editor. Since the papers are published online as PDF files, I assume that you have a PDF file which contains vector plot with data you wish to recover from it (get in numerical form) and estimate introduced recovery error.įirst of all, PDF is a vector format which is basically textual (can be read by a text editor). In this case you can achieve much higher exactness of the recovered data and even estimate the recovery error if you work with the code of the vector graph directly, without converting it to raster image. But nowadays the good practice is to publish graphs in vector form. Other answerers assume that you deal with raster image of a graph. TL DR: WebPlotDigitizer is available as a web application as well as a chrome plugin
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