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django-ram/sample_data/cards/generate_card.sh

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#!/bin/bash
mkdir -p output
for img in input/*.{jpg,png}; do
[ -e "$img" ] || continue # skip if no files
name=$(basename "${img%.*}").jpg
magick convert background.png \
\( "$img" -resize x820 \) \
-gravity center -composite \
-quality 85 -sampling-factor 4:4:4 \
"output/$name"
done