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

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 (options are described in comments for ImageOptim, Worker and all workers):

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['*.*'])

milohuang / image_optim