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#!/usr/bin/env sh
# Half the height and width of an image or pdf page by making it into 2x2 tiles.
# The first argument is the input file. Could be an image or a pdf.
# The second argument is the output filename. It is optional. Default is output.png.
if [ "${1%.pdf}" != "$1" ]; then
img_name="$(mktemp --suffix=.png)"
magick -density 300 "${1}[0]" "$img_name"
else
img_name="$1"
fi
if [ -n "$2" ]; then
output_file="$2"
else
output_file="output.png"
fi
montage "$img_name" "$img_name" "$img_name" "$img_name" -tile 2x2 -geometry +0+0 "$output_file"
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