Mozilla JPEG Encoder
https://github.com/mozilla/mozjpeg
ウェブサイトの画像を一括で最適化してみようと思う
環境
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Linux ServerName 5.13.0-30-generic #33~20.04.1-Ubuntu SMP Mon Feb 7 14:25:10 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux LSB Version: core-11.1.0ubuntu2-noarch:printing-11.1.0ubuntu2-noarch:security-11.1.0ubuntu2-noarch Distributor ID: Ubuntu Description: Ubuntu 20.04.4 LTS Release: 20.04 Codename: focal |
make
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$ wget https://github.com/mozilla/mozjpeg/archive/refs/tags/v4.0.3.tar.gz $ tar xvf v4.0.3.tar.gz $ cd mozjpeg-4.0.3/ $ cmake -G"Unix Makefiles" CFLAGS=-m64 LDFLAGS=-m64 . $ make $ ./jpegtran -version $ cp ./jpegtran ~/bin/mozjpeg $ cp ./cjpeg ~/bin/cjpeg |
一括変換スクリプト
嫌いなシェルスクリプトも書く
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#!/bin/bash # 2022-02-10 checkComment () { comment=`identify -format %c "$1" 2> /dev/null` if [ $? -ne 0 ]; then return 99 fi # echo "Commnet: {comment}" if [ "${comment}" = "MZJ" ]; then echo "Already compressed: $1" 1>&2 return 1 fi return 0 } switchArg () { # echo $1 if [ ! -e "$1" ]; then echo "Not exists: $1" 1>&2 return fi if [ -L "$1" ]; then echo "Symlink: ${1}" 1>&2 return fi if [ -d "$1" ]; then # echo dir IFS=$'\n' for line in `find "$1"`; do # echo ${line} if [ -d ${line} ]; then # echo "Directory: ${line}" continue fi if [ -L ${line} ]; then echo "Symlink: ${line}" 1>&2 continue fi checkComment ${line} if [ $? -ne 0 ]; then # already compressed or not jpeg format continue fi # echo "Compress ${line}" compress $line done else if [ ! -f "$1" ]; then echo "Not a file: $1" 1>&2 return fi compress $1 fi } compress () { fname=`basename $1` # 一応 拡張子をチェック echo ${fname} | grep -i -E '\.jpe?g$' > /dev/null 2>&1 if [ $? -ne 0 ]; then echo "File name mismatch: ${fname}" 1>&2 return 11 fi # 圧縮後も圧縮前のディレクトリー構造を維持する dir=${dst_dir}/`dirname $1` dir=`readlink -m "${dir}"` # ディレクトリーの正規化 mkdir -p "${dir}" if [ $? -ne 0 ]; then echo "Cannot make directory: ${dir}" 1>&2 return 1 fi outfile=`readlink -m "${dir}/${fname}"` # echo outfile: ${outfile} if [ -e $outfile ]; then echo "Output file exists and was skipped: ${outfile}" 1>&2 return 2 fi # CMDLINE1=(mozjpeg -copy none "$1") CMDLINE1=(mozjpeg -copy none) CMDLINE2=(cjpeg -quality ${quality} -optimize -outfile "${outfile}") if [ "${width}" != "" ]; then # echo width ${width} # 指定したサイズより幅が広い場合に縮小 CMDLINE3=(convert "$1" -resize ${width}x\> -quality 100 -) else CMDLINE3=(cat "$1") fi "${CMDLINE3[@]}" | "${CMDLINE1[@]}" | "${CMDLINE2[@]}" if [ $? -ne 0 ]; then echo "Compression failed: ${outfile}" 1>&2 else # 圧縮済みのマーク "MZJ" を書き込む mogrify -set comment "MZJ" "${outfile}" if [ $? -ne 0 ]; then echo "Comment 'MZJ' setting failed: ${outfile}" 1>&2 fi fi # サイズゼロのファイルは削除 if [ ! -s "${outfile}" ]; then # echo "FILE SIZE = 0" trash "${outfile}" echo "Removed file size was 0: ${outfile}" 1>&2 fi # echo "Compressed: ${1} => ${outfile}" echo -n "." return 0 } usage () { echo "Usage:" echo " jpeg85.sh -d <dest dir> [-w <width>] [-q <quality>] <dir|file...>" echo " default quality 85" exit 1 } main () { # コマンド引数解析 -d は後ろに値を持つ width="" dst_dir="" quality=85 while getopts d:w:q: OPT ; do case $OPT in d) dst_dir=$OPTARG ;; w) width=$OPTARG ;; q) quality=$OPTARG ;; *) usage ;; esac done shift $((OPTIND - 1)) # echo $OPT # echo $@ if [ "$dst_dir" = "" ]; then usage fi # 圧縮後のファイルを入れるディレクトリーを作成 if [ ! -d $dst_dir ]; then mkdir -p "${dst_dir}" if [ $? -ne 0 ]; then echo "Cannot make directory: ${dst_dir}" 1>&2 exit 1 fi fi echo "Destination directory: ${dst_dir}" # コマンド引数解析後の残りをループ for arg in $@; do switchArg $arg done } main $@ |