I used to work in Microsoft Windows and lots of my data are in
opj format from
Origin. I deeply searched to find a way to convert my files in Linux but I found almost nothing to work. Do you have any idea?
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Another option is to build liborigin, also gratis & libre (GPLv2). When you run the script like
opj2dat ./foo.opj it exports all the data tables to separate plain text files.
Finally you also could use QtiPlot, but you need the paid "Pro" version to actually deal with .opj files...