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#!/bin/bash
set -eu
if [ "$#" -ne 2 ]; then
echo
echo "Syntax: $0 [IMAGE.png] [NAME]"
echo
echo 'IMAGE.png -> screenshot-NAME.png + screenshot-NAME-small.png'
echo
exit 1
fi
set -v
IMAGE_FILE="$1"
NAME="$2"
cat "$IMAGE_FILE" \
| pngtopnm \
| pnmtopng -compression 9 \
> "screenshot-$NAME.png"
cat "screenshot-$NAME.png" \
| pngtopnm \
| pnmscale -ysize 128 \
> "screenshot-$NAME-small.pnm"
pnmquant 256 "screenshot-$NAME-small.pnm" \
| pnmtopng -compression 9 \
> "screenshot-$NAME-small.png"
rm -f "screenshot-$NAME-small.pnm"
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