Piet

Description

Piet is a gem that optimizes an image stored in a file, and it has integration with CarrierWave uploaders.

This gem is named after the minimalist Dutch painter Piet Mondrian.

Installation

This gem requires two image optimization utilities: optipng and jpegoptim, available in various platforms such as Unix or Windows. You can install them by following the instructions on each authors' page:

Installation for optipng
Installation for jpegoptim

After installing both utils, simply install the gem:

gem install piet

Usage

You simply require the gem

require 'piet'

and then call the optimize method:

Piet.optimize(path, opts)

The options are:

verbose: Whether you want to get the output of the command or not. It is interpreted as a Boolean value. Default: false.

CarrierWave integration

As stated before, Piet can be integrated into CarrierWave uploaders. This way, you can optimize the original image or a version.

In order to do that, firstly add piet to your Gemfile:

gem 'piet'

Then go to your CarrierWave uploader and include Piet's extension:

class ImageUploader < CarrierWave::Uploader::Base
  ...
  include Piet::CarrierWaveExtension
  ...
end

And finally use Piet! For all the images:

class ImageUploader < CarrierWave::Uploader::Base
  ...
  process :optimize
  ...
end

Or only for a version:

class ImageUploader < CarrierWave::Uploader::Base
  ...
  version :normal do
    ...
    process :optimize
  end
  ...
end

Examples

Simply Optimizing

Piet.optimize('/my/wonderful/pics/piggy.png')

Piet.optimize('/my/wonderful/pics/pony.jpg')

would optimize those PNG, GIF and JPEG files but ouput nothing.

Optimizing PNG/GIF and getting feedback

Piet.optimize('/my/wonderful/pics/piggy.png', :verbose => true)

would optimize that PNG/GIF file and ouput something similar to this one:

** Processing: piggy.png
340x340 pixels, 4x8 bits/pixel, RGB+alpha
Input IDAT size = 157369 bytes
Input file size = 157426 bytes

Trying:
  zc = 9  zm = 9  zs = 0  f = 1		IDAT size = 156966
  zc = 9  zm = 8  zs = 0  f = 1		IDAT size = 156932

Selecting parameters:
  zc = 9  zm = 8  zs = 0  f = 1		IDAT size = 156932

Output IDAT size = 156932 bytes (437 bytes decrease)
Output file size = 156989 bytes (437 bytes = 0.28% decrease)

Optimizing JPEG and getting feedback

Piet.optimize('/my/wonderful/pics/pony.jpg', :verbose => true)

would optimize that JPEG file and ouput similar to this one:

/my/wonderful/pics/pony.jpg 235x314 24bit JFIF  [OK] 15305 --> 13012 bytes (14.98%), optimized.

TODO

Binary tool for optimizing a file
Add some testing!

Changelog

v.0.1.0 Optimization of PNGs and JPEGs, including an integration with Carrierwave
v.0.1.1 Added support for GIFs. Added an extra option to use pngquant (thanks @rogercampos). Solved problems with Carrierwave >= 0.6 (thanks @mllocs and @huacnlee).

sesch / piet