On Wed, Jan 20, 2016 at 03:37:36AM +0100, Thor Andreassen wrote:
[...]
> A crude way of getting the raw numbers could be to use the color values
> from the generated png file, e.g. with Imagemagick:
>
> sox -n -n synth 1 synth 1k:5k spectrogram -r -o - |
> convert png:- txt:- |
>
> # translate into Gnuplot compatible input
> awk -v FS='[,:() ]+' 'NR > 2 { print $1, $2, ($3+$4+$5)/3
> }' |
> awk 'NR > 2 && $2 != prev { printf "\n" } { prev = $2 }
> 1' \
> > spectrogram.dat
With the rgbimage feature of Gnuplot, you can actually access the pixels
directly, e.g.:
echo "plot 'spectrogram.png' binary filetype=png
format='%uchar%uchar%uchar' \
using 1:2:3 with rgbimage" | gnuplot --persist
Or if you want to set the red channel to zero:
echo "plot 'spectrogram.png' binary filetype=png
format='%uchar%uchar%uchar' \
using (0):2:3 with rgbimage" | gnuplot --persist
[...]
--
best regards
Thor Andreassen
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