70 lines
1.7 KiB
Plaintext
70 lines
1.7 KiB
Plaintext
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#!/usr/bin/env bash
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# A simple script that losslessly optimizes image files given to it.
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#
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# Examples:
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# imgoptim image.jpg image.png image.gif
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# imgoptim directory_of_images/
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# imgoptim directory_of_images/*.png
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#
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# Requires:
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# PNGs: optipng, pngquant (lossy)
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# JPGs: jpegtran, jpegoptim (lossy)
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# GIFs: gifsicle
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set -e
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LOSSY=
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usage() {
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cat <<EOL
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Usage: ${0##*/} [-lh] IMAGE [IMAGE2 [IMAGE3 [...]]]
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-l enable lossy compression
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-h this help
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EOL
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}
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while getopts hl opt; do
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case $opt in
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h) usage; exit;;
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l) LOSSY=1;;
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:) >&2 echo "$OPTARG requires an argument"; usage; exit 1;;
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*) >&2 echo "Not a valid arg: $opt"; usage; exit 1;;
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esac
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done
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shift $((OPTIND-1))
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_filesize() {
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case $OSTYPE in
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darwin*) stat -c%s "$1" ;;
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*) stat --printf="%s" "$1" ;;
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esac
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}
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for file in $@; do
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if [[ -d $file ]]; then
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imgoptim $file/*
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elif [[ -f $file ]]; then
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pre_size=$(_filesize "$file")
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case ${file##*.} in
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png)
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[[ $LOSSY ]] && pngquant $file
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optipng -nc -nb -o7 $file
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;;
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gif)
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gifsicle --batch --optimize=3 "$file"
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;;
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jpg|jpeg)
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[[ $LOSSY ]] && jpegoptim --max=90 "$file"
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jpegtran -copy none -optimize -progressive -outfile "$file" "$file"
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;;
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*) printf "Unrecognized file '$file': ignored"
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;;
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esac
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post_size=$(_filesize "$file")
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perc=$(echo "((${pre_size} - ${post_size}) / ${pre_size}) * 100" | bc -l)
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printf "* %s: %d => %d (%.2f%% reduction)\n" "$file" "${pre_size}" "${post_size}" "$perc"
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fi
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done
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