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#!/bin/sh
margin=100
aspect_ratio=177
extent=$((margin * aspect_ratio / 100))%x${margin}%
options="-gravity center -extent $extent"
for input
do
case "$input" in
*.*) output=${input%.*}.margins.${input##*.} ;;
*) output=$input.margins.png ;;
esac
convert "$input" $options "$output"
done
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