图片格式转化和压缩

网页的大小决定网站的打开速度，网页越小速度越快，用户体验越好。网页中占用空间最大的为图片，本文提供图片图片格式转化和压缩的方法。

格式转化

convert png to jpg

for file in `ls | grep ".png"`; do newfile=`echo $file | sed 's/.png//g'`; sips -s format jpeg $file --out ./$newfile.jpg; mv $file /tmp; done

• https://www.cisdem.com/resource/png-to-jpg-mac.html#command
• Cisdem PDF Converter OCR for Mac

压缩

for file in `ls | grep -e "tuya.png" -e "tuya.jpg"`; do newfile=`echo $file | sed 's/-tuya//g'`; mv $file $newfile; done

#!/bin/bash

set -ex

for suffix in png jpg; do
    for file in `find . -type f -name "*.${suffix}"`; do
        tmpfile=$(echo ${file} | sed "s/.$suffix/.t1m2p3.$suffix/g")
        mv ${file} ${tmpfile}
        format=${suffix}
        if [ "$suffix" == "jpg" ]; then
            format="jpeg"
        fi
        sips -s format ${format} ${tmpfile} --out ${file}
        rm ${tmpfile}
    done
done