Optimize (lossless compress, optionally lossy) images (jpeg, png, gif, svg) using external utilities:
- advpng from AdvanceCOMP (will use zopfli on default/maximum level 4)
- gifsicle
- jhead
- jpegoptim
- jpeg-recompress
- jpegtran from Independent JPEG Group's JPEG library
- optipng
- pngcrush
- pngout
- pngquant
- svgo
Based on ImageOptim.app.
Documentation for latest version and master.
gem install image_optim
You may also want to install image_optim_pack
(see Binaries pack).
gem install image_optim_pack
Add to your Gemfile
:
gem 'image_optim'
With image_optim_pack
:
gem 'image_optim'
gem 'image_optim_pack'
With version:
gem 'image_optim', '~> 0.11'
If you want to check latest changes:
gem 'image_optim', :git => 'git://github.com/toy/image_optim.git'
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:$PATH" image_optim *.jpg
for example:
PATH="/Applications/ImageOptim.app/Contents/MacOS:$PATH" image_optim *.jpg
-
inside script:
ENV['PATH'] = "/custom/location:#{ENV['PATH']}"; ImageOptim.optimize_images([…])
for example:
ENV['PATH'] = "/Applications/ImageOptim.app/Contents/MacOS:#{ENV['PATH']}"; ImageOptim.optimize_images([…])
Easiest way to get latest versions of most binaries for image_optim
for Linux and Mac OS X is by installing image_optim_pack
gem.
Check installation instructions in Gem installation section.
Pack doesn't include pngout
and svgo
binaries, their installation instructions are provided below.
sudo apt-get install -y advancecomp gifsicle jhead jpegoptim libjpeg-progs optipng pngcrush pngquant
If you get an old version of pngquant
, please check how to install up-to-date version or compile from source at http://pngquant.org/.
sudo yum install -y advancecomp gifsicle jhead libjpeg optipng pngquant
You may also need to install libjpeg-turbo-utils
instead of libjpeg
:
sudo yum install -y libjpeg-turbo-utils
You will also need to install jpegoptim
and pngcrush
from source:
Replace X.Y.Z
with latest version number from http://www.kokkonen.net/tjko/projects.html#jpegoptim.
JPEGOPTIM_VERSION=X.Y.Z
cd /tmp
curl -O http://www.kokkonen.net/tjko/src/jpegoptim-$JPEGOPTIM_VERSION.tar.gz
tar zxf jpegoptim-$JPEGOPTIM_VERSION.tar.gz
cd jpegoptim-$JPEGOPTIM_VERSION
./configure && make && make install
Replace X.Y.Z
with latest version number from http://sourceforge.net/projects/pmt/files/pngcrush/.
PNGCRUSH_VERSION=X.Y.Z
cd /tmp
curl -O http://iweb.dl.sourceforge.net/project/pmt/pngcrush/$PNGCRUSH_VERSION/pngcrush-$PNGCRUSH_VERSION.tar.gz
tar zxf pngcrush-$PNGCRUSH_VERSION.tar.gz
cd pngcrush-$PNGCRUSH_VERSION
make && cp -f pngcrush /usr/local/bin
sudo port install advancecomp gifsicle jhead jpegoptim jpeg optipng pngcrush pngquant
brew install advancecomp gifsicle jhead jpegoptim jpeg optipng pngcrush pngquant
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
svgo
is available from NPM.
npm install -g svgo
Download and install the jpeg-recompress
binary from the JPEG-Archive Releases page,
or follow the instructions to build from source.
image_optim *.{jpg,png,gif,svg}
image_optim -r .
image_optim -h
Initialize optimizer (or you can call optimization methods directly on ImageOptim
):
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')
Optimize image data:
image_optim.optimize_image_data(data)
Multiple images:
image_optim.optimize_images(Dir['*.png']) do |unoptimized, optimized|
if optimized
puts "#{unoptimized} => #{optimized}"
end
end
image_optim.optimize_images!(Dir['*.*'])
image_optim.optimize_images_data(datas)
ImageOptim::Railtie
will automatically register sprockets preprocessor unless you set config.assets.image_optim = false
or config.assets.compress = false
(later for partial rails 3 compatibility).
You can provide options for image_optim used for preprocessor through config config.assets.image_optim = {nice: 20, svgo: false}
(ruby1.8 style: {:nice => 20, :svgo => false}
).
Check available options in options section.
Image optimization can be time consuming, so depending on your deployment process you may prefer to optimize original asset files.
Configuration in YAML format will be read and prepended to options from two paths:
$XDG_CONFIG_HOME/image_optim.yml
(by default~/.config/image_optim.yml
).image_optim.yml
in current working directory
Paths can be changed using :config_paths
option and --config-paths
argument.
Example configuration:
nice: 20
pngout: false # disable
optipng:
level: 5
:nice
— Nice level (defaults to10
):threads
— Number of threads or disable (defaults to number of processors):verbose
— Verbose output (defaults tofalse
):pack
— Require image_optim_pack or disable it, by default image_optim_pack will be used if available, will turn on:skip-missing-workers
unless explicitly disabled (defaults tonil
):skip_missing_workers
— Skip workers with missing or problematic binaries (defaults tofalse
):allow_lossy
— Allow lossy workers and optimizations (defaults tofalse
)
Worker can be disabled by passing false
instead of options hash or by setting option :disable
to true
.
:level
— Compression level:0
- don't compress,1
- fast,2
- normal,3
- extra,4
- extreme (defaults to4
)
:interlace
— Interlace:true
- interlace on,false
- interlace off,nil
- as is in original image (defaults to running two instances, one with interlace off and one with on):level
— Compression level:1
- light and fast,2
- normal,3
- heavy (slower) (defaults to3
):careful
— Avoid bugs with some software (defaults tofalse
)
Worker has no options
:strip
— List of extra markers to strip::comments
,:exif
,:iptc
,:icc
or:all
(defaults to:all
):max_quality
— Maximum image quality factor0
..100
, ignored in default/lossless mode (defaults to100
)
:quality
— JPEG quality preset:0
- low,1
- medium,2
- high,3
- veryhigh (defaults to3
)
:copy_chunks
— Copy all chunks (defaults tofalse
):progressive
— Create progressive JPEG file (defaults totrue
):jpegrescan
— Use jpegtran through jpegrescan, ignore progressive option (defaults tofalse
)
:level
— Optimization level preset:0
is least,7
is best (defaults to6
):interlace
— Interlace:true
- interlace on,false
- interlace off,nil
- as is in original image (defaults tofalse
):strip
— Remove all auxiliary chunks (defaults totrue
)
: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 tofalse
):brute
— Brute force try all methods, very time-consuming and generally not worthwhile (defaults tofalse
):blacken
— Blacken fully transparent pixels (defaults totrue
)
:copy_chunks
— Copy optional chunks (defaults tofalse
):strategy
— Strategy:0
- xtreme,1
- intense,2
- longest Match,3
- huffman Only,4
- uncompressed (defaults to0
)
:quality
— min..max - don't save below min, use less colors below max (both in range0..100
; in yaml -!ruby/range 0..100
), ignored in default/lossless mode (defaults to100..100
,0..100
in lossy mode):speed
— speed/quality trade-off:1
- slow,3
- default,11
- fast & rough (defaults to3
)
Worker has no options
List of contributors to image_optim
.
If you would like to contribute - that is great and you are very welcome. Please check few notes in file CONTRIBUTING.markdown.
Financial contributions can be made via gratipay.
In separate file CHANGELOG.markdown.
Copyright (c) 2012-2015 Ivan Kuchin. See LICENSE.txt for details.