Created
May 21, 2019 23:44
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intensifies Slack emoji creator
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#!/bin/bash | |
# Generate a `:something-intensifies:` Slack emoji, given a reasonable image | |
# input. I recommend grabbing an emoji from https://emojipedia.org/ | |
set -euo pipefail | |
# Number of frames of shaking | |
count=10 | |
# Max pixels to move while shaking | |
delta=4 | |
if [ $# -eq 0 ]; then | |
echo "Usage: $0 input.png" | |
exit 1 | |
fi | |
input=$1 | |
cd "$(dirname "$input")" | |
filename=$(basename -- "$input") | |
# Add 10% padding to width and height, then scale to 128x128 | |
width=$(identify -format "%w" "$filename") | |
height=$(identify -format "%h" "$filename") | |
new_width=$(( width + width / 10 )) | |
new_height=$(( height + height / 10 )) | |
extended="${filename%.*}-extended.png" | |
convert \ | |
-gravity center \ | |
-background none \ | |
-extent ${new_width}x${new_height} \ | |
-geometry 128x128 \ | |
"$filename" \ | |
"$extended" | |
# Generate some shaky frames | |
frame="${filename%.*}-frame" | |
n=0 | |
while [ "$n" -lt "$count" ]; do | |
# Generate some random shake | |
x=$((RANDOM % (delta * 2) - delta)) | |
y=$((RANDOM % (delta * 2) - delta)) | |
# Ensure coordinates are of the form +3 or -4 | |
[ "$x" -ge 0 ] && x="+$x" | |
[ "$y" -ge 0 ] && y="+$y" | |
# Shake the image! | |
convert "$extended" -page "${x}${y}" -background none -flatten "$frame"-"$n".gif | |
n=$((n + 1)) | |
done | |
# Combine the frames into a GIF | |
gif="${filename%.*}-intensifies.gif" | |
convert -background none -dispose Background -delay 1x30 -loop 0 "${frame}"-*.gif "$gif" | |
# Clean up | |
rm "$extended" "${frame}"-*.gif | |
# We did it y'all | |
echo "Created $gif. Enjoy!" |
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for reasons i still don't entirely understand, the script as it is now doesn't properly dispose of frames on my m1 max macbook pro (macos 12.4, imagemagick 7.1.0-29), resulting in this:
expand to see gif
however, if i modify line 57 by using
set
on the dispose setting like this:it works 🎉
expand to see gif