[Gnuplot-info] Extracting (approximate) data from a PostScript file containing gnuplot-generated plot

[Andrew D. <ade...@an...>]

Hi,

Suppose that I have a PostScript file containing a plot which was generated
using gnuplot.  However, I do not have the source data, nor do I have the
gnuplot commands that were used to generate the plot.

Do you know of any way to somehow extract data from a graphic representation
(i.e., a PostScript file)?  Such code would have to literally "read off of
the graph" (in particular, I have a smoothed line/scatter XY plot) from the
pixel representation, and I know that the results would be approximate at
best (but this would still be very highly desirable).  

Do you have any experience with this?  Thank you for your time!

Andrew DeYoung
Carnegie Mellon University