Summary edit

The script used to generate this animation:

#!/bin/bash

mkdir -p frames

imgw=32
outw=256
outsize=${outw}x64

for i in {1..160}
do
    rate=`echo "scale=1;$i.0/5.0" | bc`
    rrate=`echo "scale=1;(32-$rate)" | bc`
    if [ $i -le 80 ]; then
        rrate=$rate
    fi
    convert -size $outsize canvas: -fx "(sin((i+0.5)/w*2*Pi*$rate-Pi)+1)/2" frames/high$i.gif
    convert -size ${imgw}x1 canvas: -fx "(sin((i+0.5)/w*2*Pi*$rate-Pi)+1)/2" -interpolate nearest-neighbor -interpolative-resize $outsize\! frames/low$i.gif
    convert -size $outsize canvas: -fx "(sin((i+0.5)/w*2*Pi*$rrate-Pi)+1)/2" frames/recons$i.gif
    convert frames/high$i.gif frames/low$i.gif frames/recons$i.gif -append frames/$i.gif
done

convert -loop 0 -delay 10 frames/%d.gif[1-160] ani.gif

Licensing edit

I, the copyright holder of this work, hereby publish it under the following license:

This file is made available under the Creative Commons CC0 1.0 Universal Public Domain Dedication.

The person who associated a work with this deed has dedicated the work to the public domain by waiving all of their rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law. You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission. http://creativecommons.org/publicdomain/zero/1.0/deed.enCC0Creative Commons Zero, Public Domain Dedicationfalsefalse