Scripts (bash, Octave) for calibrating a DIY spectroscope, e.g. the one I made: https://www.thingiverse.com/thing:4729351
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Bash script spectra.sh0 : to convert PNG spectrum image to a text file (spectrum.dat)
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Octave script spectrum_cal0.m : to calibrate a spectrum in two stages (1,2). Also to (slightly) recalibrate an existing calibration (stage 3).
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Octave script spectrum.m : to plot a spectrum, optionally subtracting the continuum.