image_optim
Optimize (lossless compress) images (jpeg, png, gif) using external utilities:
- advpng from AdvanceCOMP
- gifsicle
- jpegoptim
- jpegtran from Independent JPEG Group's JPEG library
- optipng
- pngcrush
- pngout
Based on ImageOptim.app.
Gem installation
gem install image_optim
Binaries location
Simplest way for image_optim
to locate binaries is to install them in common location present in PATH
(see Binaries installation).
If you cannot install to common location, then install to custom one and add it to PATH
.
Specify custom bin location using XXX_BIN
environment variable (JPEGOPTIM_BIN
, OPTIPNG_BIN
, …).
Besides permanently setting environment variables in ~/.profile
, ~/.bash_profile
, ~/.bashrc
, ~/.zshrc
, … they can be set:
before command:
PATH="/custom/location:$PATH" image_optim *.jpg
inside script:
ENV['PATH'] = "/custom/location:#{ENV['PATH']}"; ImageOptim.optimize_images([…])
Binaries installation
Linux - Debian/Ubuntu
sudo apt-get install -y advancecomp gifsicle jpegoptim libjpeg-progs optipng pngcrush
Linux - RHEL/Fedora/Centos
sudo yum install -y advancecomp gifsicle libjpeg optipng
You will also need to install jpegoptim
and pngcrush
from source:
jpegoptim
cd /tmp
curl -O http://www.kokkonen.net/tjko/src/jpegoptim-1.2.4.tar.gz
tar zxf jpegoptim-1.2.4.tar.gz
cd jpegoptim-1.2.4
./configure && make && make install
pngcrush
cd /tmp
curl -O http://iweb.dl.sourceforge.net/project/pmt/pngcrush/1.7.43/pngcrush-1.7.43.tar.gz
tar zxf pngcrush-1.7.43.tar.gz
cd pngcrush-1.7.43
make && cp -f pngcrush /usr/local/bin
OS X: Macports
sudo port install advancecomp gifsicle jpegoptim jpeg optipng pngcrush
OS X: Brew
brew install advancecomp gifsicle jpegoptim jpeg optipng pngcrush
pngout installation (optional)
You can install pngout
by downloading and installing the binary versions.
Note: pngout is free to use even in commercial soft, but you can not redistribute, repackage or reuse it without consent and agreement of creator. license
Usage
From shell
image_optim *.{jpg,png,gif}
image_optim -h
From ruby
Initilize optimizer:
image_optim = ImageOptim.new
image_optim = ImageOptim.new(:pngout => false)
image_optim = ImageOptim.new(:nice => 20)
Optimize image getting temp path:
image_optim.optimize_image('a.png')
Optimize image in place:
image_optim.optimize_image!('b.jpg')
Multiple images:
image_optim.optimize_images(Dir['*.png']) do |unoptimized, optimized|
if optimized
puts "#{unoptimized} => #{optimized}"
end
end
image_optim.optimize_images!(Dir['*.*'])
Options
Worker can be disabled by passing false instead of options hash.
pngcrush
:chunks
— List of chunks to remove or 'alla' - all except tRNS/transparency or 'allb' - all except tRNS and gAMA/gamma (defaults to alla):fix
— Fix otherwise fatal conditions such as bad CRCs (defaults to false):brute
— Brute force try all methods, very time-consuming and generally not worthwhile (defaults to false)
pngout
:copy_chunks
— Copy optional chunks (defaults to false):strategy
— Strategy: 0 - xtreme, 1 - intense, 2 - longest Match, 3 - huffman Only, 4 - uncompressed (defaults to 0)
optipng
:level
— Optimization level preset 0 is least, 7 is best (defaults to 6):interlace
— Interlace, true - interlace on, false - interlace off, nil - as is in original image (defaults to false)
advpng
:level
— Compression level: 0 - don't compress, 1 - fast, 2 - normal, 3 - extra, 4 - extreme (defaults to 4)
jpegoptim
:strip
— List of extra markers to strip: comments, exif, iptc, icc or all (defaults to all):max_quality
— Maximum image quality factor 0..100 (defaults to 100)
jpegtran
:copy_chunks
— Copy all chunks (defaults to false):progressive
— Create progressive JPEG file (defaults to true):jpegrescan
— Use jpegtran through jpegrescan, ignore progressive option (defaults to true)
gifsicle
:interlace
— Turn interlacing on (defaults to false)
Copyright
Copyright (c) 2012-2013 Ivan Kuchin. See LICENSE.txt for details.