Linux下压缩和优化jpg与png图片的方法
jpegotim压缩jpg图片
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安装jpegotim
如果你有epel yum源，使用如下命令即可
# yum install jpegoptim
压缩图片命令
# jpegoptim ttlsa.jpg
ttlsa.jpg 1425x823 24bit N JFIF [OK] 1074449 --> 853514 bytes (20.56%), optimized.
可以看到ttlsa.jpg自动被压缩了20.56%。
再压缩一次
# jpegoptim ttlsa.jpg
ttlsa.jpg 1425x823 24bit N JFIF [OK] 853514 --> 853514 bytes (0.00%), skipped.
图片已经被压缩过了，所以提示跳过，不需要在被压缩。
提供一个批量压缩的脚本
for i in /data/site/image.ttlsa.com/images/*.jpg; do jpegoptim $i; done
pngcrush优化PNG图片
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项目地址：http://pmt.sourceforge.net/pngcrush/
# wget http://downloads.sourceforge.net/project/pmt/pngcrush/1.7.88/pngcrush-1.7.88.tar.gz
# tar -xzvf pngcrush-1.7.88.tar.gz
# cd pngcrush-1.7.88
# make
# cp pngcrush /usr/bin
pngcrush使用语法
usage: pngcrush [options except for -e -d] infile.png outfile.png
pngcrush -e ext [other options] file.png ...
pngcrush -d dir/ [other options] file.png ...
pngcrush -ow [other options] file.png [tempfile.png]
pngcrush -n -v file.png ...
options:
-bail (bail out of trial when size exceeds best size found
-bit_depth depth (deprecated)
-blacken (zero samples underlying fully-transparent pixels)
-brute (use brute-force: try 148 different methods)
........更多内容请自己看帮助......
pngcrush简单命令
pngcrush -brute -e "myimage_compressed.png" myimage.png
.........省略.....
Best pngcrush method = 123 (ws 15 fm 4 zl 9 zs 1) = 124820
for output to ttlsattlsa_new.png
(1.63% critical chunk reduction)
(1.63% filesize reduction)
CPU time decoding 1.560, encoding 7.640, other 0.030, total 9.230 sec.
批量优化PNG图片
pngcrush -brute -d "/data/site/image.ttlsa.com/images" *.png