=== EWWW Image Optimizer ===
Contributors: nosilver4u
Donate link: https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=MKMQKCBFFG3WW
Tags: image, attachment, optimize, optimization, lossless, lossy, photo, picture, seo, compression, gmagick, jpegtran, gifsicle, optipng, pngout, pngquant, jpegmini, tinyjpg, tinypng, webp, wp-cli 
Requires at least: 4.4
Tested up to: 4.6
Stable tag: 2.9.6
License: GPLv3

Reduce image sizes in WordPress including NextGEN, GRAND FlAGallery, FooGallery and more using lossless/lossy methods and image format conversion.

== Description ==

The EWWW Image Optimizer is a WordPress plugin that will automatically optimize your images as you upload them to your blog. It can optimize the images that you have already uploaded, convert your images automatically to the file format that will produce the smallest image size (make sure you read the WARNINGS), and optionally apply lossy compression to achieve huge savings for PNG and JPG images.

**Why use EWWW Image Optimizer?**

1. **Your pages will load faster.** Smaller image sizes means faster page loads. This will make your visitors happy, and can increase revenue.
1. **Faster backups.** Smaller image sizes also means faster backups.
1. **Less bandwidth usage.** Optimizing your images can save you hundreds of KB per image, which means significantly less bandwidth usage.
1. **Super fast.** The plugin can run on your own server, so you don’t have to wait for a third party service to receive, process, and return your images. You can optimize hundreds of images in just a few minutes. PNG files take the longest, but you can adjust the settings for your situation.
1. **Best JPG optimization.** With TinyJPG integration, nothing else comes close (requires an API subscription).
1. **Best PNG optimization.** You can use pngout, optipng, and pngquant in conjunction. And if that isn't enough, try the lossy PNG option powered by TinyPNG.
1. **Root access not needed** Pre-compiled binaries are made available to install directly within the Wordpress folder, and cloud optimization is provided for those who cannot run the binaries locally.
1. **Optimize everything** With the wp_image_editor class extension, and the ability to specify your own folders for scanning, any image in Wordpress can be optimized.

By default, EWWW Image Optimizer uses lossless optimization techniques, so your image quality will be exactly the same before and after the optimization. The only thing that will change is your file size. The one small exception to this is GIF animations. While the optimization is technically lossless, you will not be able to properly edit the animation again without performing an --unoptimize operation with gifsicle. The gif2png and jpg2png conversions are also lossless but the png2jpg process is not lossless. The lossy optimization for JPG and PNG files uses sophisticated algorithms to minimize perceptual quality loss, which is vastly different than setting a static quality/compression level.

The tools used for optimization are [jpegtran](http://jpegclub.org/jpegtran/), [TinyJPG](http://www.tinyjpg.com), [JPEGmini](http://www.jpegmini.com), [optipng](http://optipng.sourceforge.net/), [pngout](http://advsys.net/ken/utils.htm), [pngquant](http://pngquant.org/), [TinyPNG](http://www.tinypng.com), and [gifsicle](http://www.lcdf.org/gifsicle/). Most of these are freely available except TinyJPG/TinyPNG and JPEGmini. Images are converted using the above tools and one of the following: GMagick, IMagick, GD or 'convert' (ImageMagick).

EWWW Image Optimizer calls optimization utilities directly which is well suited to shared hosting situations where these utilities may already be installed. Pre-compiled binaries/executables are provided for optipng, gifsicle, pngquant, cwebp, and jpegtran. Pngout can be installed with one-click from the settings page. If none of that works, there is a cloud option that will work for any site.

If you need a version of this plugin for cloud use only, see [EWWW Image Optimizer Cloud](https://wordpress.org/plugins/ewww-image-optimizer-cloud/). It is much more compact as it does not contain any binaries or any mention of the exec() function.

= Bulk Optimize =

There are two functions on the Bulk Optimize page. One is to optimize all images in the Media Library. The Scan and Optimize is for everything else. Officially supported galleries (GRAND FlaGallery and NextGEN) have their own Bulk Optimize pages. 

= Skips Previously Optimized Images =

All optimized images are stored in the database so that the plugin does not attempt to re-optimize them unless they are modified. On the Bulk Optimize page you can view a list of already optimized images. You may additionally choose to remove individual images from the list, or use the Force optimize option to override the default behavior. The re-optimize links on the Media Library page also force the plugin to ignore the previous optimization status of images.

= WP Image Editor = 

All images created by the built-in WP_Image_Editor class will be automatically optimized. Current implementations are GD, Imagick, and Gmagick. Images optimized via this class include Animated GIF Resize, BuddyPress Activity Plus (thumbs), Easy Watermark, Hammy, Imsanity, MediaPress, Meta Slider, MyArcadePlugin, OTF Regenerate Thumbnails, Regenerate Thumbnails, Simple Image Sizes, WP Retina 2x, WP RSS Aggregator and probably countless others. If you are not sure if a plugin uses WP_Image_Editor, post your question in the support forums.

= Optimize Everything Else =

Site admins can specify any folder within their wordpress folder to be optimized. The 'Scan and Optimize' option under Media->Bulk Optimize will optimize theme images, BuddyPress avatars, BuddyPress Activity Plus images, Meta Slider slides, WP Symposium images, GD bbPress attachments, Grand Media Galleries, and any user-specified folders. Additionally, this tool can run on an hourly basis via wp_cron to keep newly uploaded images optimized. Scheduled optimization should not be used for any plugin that uses the built-in Wordpress image functions.

= WebP Images =

Can generate WebP versions of your images, and enables you to serve even smaller images to supported browsers. Several methods are available for serving WebP images, including Apache-compatible rewrite rules and our Alternative WebP Rewriting option compatible with caches and CDNs. Also works with the WebP option in the Cache Enabler plugin from KeyCDN.

= WP-CLI =

Allows you to run all Bulk Optimization processes from your command line, instead of the web interface. It is much faster, and allows you to do things like run it in 'screen' or via regular cron (instead of wp-cron, which can be unpredictable on low-traffic sites). Install WP-CLI from wp-cli.org, and run 'wp-cli.phar help ewwwio optimize' for more information. 

= FooGallery =

All images uploaded and cached by FooGallery are automatically optimized. Previous uploads can be optimized by running the Media Library Bulk Optimize. Previously cached images can be optimized by entering the wp-content/uploads/cache/ folder under Folders to Optimize and running a Scan & Optimize from the Bulk Optimize page.

= NextGEN Gallery =

Features optimization on upload capability, re-optimization, and bulk optimizing. The NextGEN Bulk Optimize function is located near the bottom of the NextGEN menu, and will optimize all images in all galleries. It is also possible to optimize groups of images in a gallery, or multiple galleries at once.

= NextCellent Gallery =

Features all the same capability as NextGEN, and is the continuation of legacy (1.9.x) NextGEN support.

= GRAND Flash Album Gallery =

Features optimization on upload capability, re-optimization, and bulk optimizing. The Bulk Optimize function is located near the bottom of the FlAGallery menu, and will optimize all images in all galleries. It is also possible to optimize groups of images in a gallery, or multiple galleries at once.

= Image Store =

Uploads are automatically optimized. Look for Optimize under the Image Store (Galleries) menu to see status of optimization and for re-optimization and bulk-optimization options. Using the Bulk Optimization tool under Media Library automatically includes all Image Store uploads.

= CDN Support =

Uploads to Amazon S3, Azure Storage, Cloudinary, and DreamSpeed CDN are optimized. All pull mode CDNs like Cloudflare, KeyCDN, MaxCDN, and Sucuri CloudProxy are also supported.

= Translations =

Huge thanks to all our translators: 
Bulgarian translation by Ivan Arnaudov  
Dutch translation by Ludo Rubben  
French translation by Bruno Tritsch, Nicolas Juen, Philippe Dupuit, Jean-Baptiste Gourdin, Dominique Goethals, Mickaël Chapusot, and Guillaume Thibord  
German translation by Christian Herrmann and Ralf Platschi
Italian translation by  Umberto Moroni, Alexander Gevak and Fabrizio Balestrieri  
Polish translation by Grzegorz Janoszka  
Portuguese (Brazil) translation by Pedro Marcelo de Sá Alves and Celso Azevedo  
Portuguese (Portugal) translation by Celso Azevedo
Romanian translation by Iosif Kadar of MediasInfo.ro  
Russian translation by Elvis of turkenichev.ru, Roman Sobol, and Vitaliy Ralle
Spanish translation by Manuel Ballesta Ruiz and Adrián López Galera  
Swedish translation by Alexander Widén  
Turkish translation by sfatih  
Ukrainian translation by Roman Sobol
Full contributors list is at https://translate.wordpress.org/projects/wp-plugins/ewww-image-optimizer/contributors

If you would like to help translate this plugin (new or existing translations), you can do so here: https://translate.wordpress.org/projects/wp-plugins/ewww-image-optimizer
To receive updates when new strings are available for translation, you can signup here: https://ewww.io/register/

== Installation ==

1. Upload the 'ewww-image-optimizer' plugin to your '/wp-content/plugins/' directory.
1. Activate the plugin through the 'Plugins' menu in WordPress.
1. Ensure jpegtran, optipng, pngout and gifsicle are installed on your Linux server (basic installation instructions are below if they are not). You will receive a warning when you activate the plugin if they are not present. This message will go away once you have them installed.
1. The plugin will attempt to install jpegtran, optipng, and gifsicle automatically for you. This requires that the wp-content folder is writable by the user running the web server.
1. If the automatic install did not work, find the appropriate binaries for your system in the ewww-image-optimizer plugin folder, copy them to wp-content/ewww/ and remove the OS 'tag' (like -linux or -fbsd). No renaming is necessary on Windows, just copy the .exe files to the wp-content/ewww folder. IMPORTANT: Do not symlink or modify the binaries in any way, or they will not pass the security checks. If you transfer files via FTP, be sure to transfer in binary mode, not ascii or text.
1. If the binaries don't run locally, you can sign up for the EWWW IO cloud service to run them via our optimization servers: https://ewww.io/plans/
1. *Recommended* Visit the settings page to enable/disable specific tools and turn on advanced optimization features.
1. Done!

If these steps do not work, more detailed instructions are available below the video tutorials.

At the bottom of this page, you will find a list of known working webhosts. If you have any contributions or corrections to these lists, please contact me via the form at https://ewww.io/contact-us/

EWWW IO - Getting Started
[youtube https://www.youtube.com/watch?v=bwn53mhFdTs]
EWWW IO - Advanced Settings
[youtube https://www.youtube.com/watch?v=kifGIs5Lx2U]
EWWW IO - Converting Images
[youtube https://www.youtube.com/watch?v=xAGtdv3vrYg]
EWWW IO - WebP
[youtube https://www.youtube.com/watch?v=OeYJgTy3D94]
EWWW IO - Cloud API Walkthrough
[youtube https://www.youtube.com/watch?v=U78FFkM582E]
Using EWWW IO:
[youtube https://www.youtube.com/watch?v=uELM25v-qgU]

= Installing pngout =

Pngout is not enabled by default because it is resource intensive. Optipng is the preferred PNG optimizer if you have resource (CPU) constraints. Pngout is also not open-source for those who care about such things, but the command-line version is free.

1. Go to the settings page.
1. Uncheck the option to disable pngout and Save your settings.
1. Click the Automatic link in the Plugin Status area to install pngout for your server, and the plugin will download the pngout archive, unpack it, and install the appropriate version for your server.
1. Adjust the pngout level according to your needs. Level 0 gives the best results, but can take up to a minute or more on a single image.

To manually install pngout:

1. Click the Manual link in the Plugin Status.
1. Download the version of pngout that matches your webserver (NOT your desktop/laptop). Always use the -static downloads for Linux and FreeBSD. If you don't know if you have a linux server, or Mac, or whether it is 32-bit vs 64-bit, ask your webhost, or turn on debugging and post the debug information in the forums with your request for assistance.
1. If you have Windows on your personal computer, you may need to install 7-zip or something similar to extract the .tar.gz files. Linux and Mac OS X systems should have built-in support for gzipped files.
1. For Linux and FreeBSD pngout downloads, you will see an i686 folder and x86_64. The first is for 32-bit the latter is for 64-bit. Upload the pngout-static file (pngout for Mac, pngout.exe for Windows) to the wp-content/ewww/ folder on your web server.
1. Make sure the permissions are set correctly. It is recommended to use 755 or rwxr-xr-x, which is read, write, execute for the owner, read/execute for the group, and read/execute for everyone else.
1. If pngout still is not working, you can download older versions, but do not go further back than the 20130221 release: http://static.jonof.id.au/dl/kenutils/

= Installing (Compiling) other tools =

https://ewww.io/2014/12/06/the-plugin-says-im-missing-something/

= Webhosts =

In general, these lists only apply to shared hosting services. If the providers below have VPS or dedicated server options, those will likely work just fine. If you have any contributions or corrections to these lists, please contact me via the form at https://ewww.io

Webhosts where things work (mostly) out of the box:

* [A2 Hosting](https://partners.a2hosting.com/solutions.php?id=5959&url=638): EWWW IO is installed automatically for new sites, and is fully supported by A2 (referral link). Their Turbo+SSD hosting is very nice (and still cheap).
* [aghosted](https://aghosted.com/)
* [Arvixe](http://www.arvixe.com)
* [Bluehost](https://www.bluehost.com)
* [DigitalBerg](https://www.digitalberg.com)
* [Dreamhost](https://www.dreamhost.com)
* [GoDaddy](https://www.godaddy.com) (only with PHP 5.3+)
* [gPowerHost](https://gpowerhost.com/)
* [HostGator](http://www.hostgator.com)
* [Hetzner Online](https://www.hetzner.de)
* [Hosterdam](http://www.hosterdam.com) (FreeBSD)
* [HostMonster](https://www.hostmonster.com)
* [iFastNet](https://ifastnet.com/portal/) (with custom php.ini from customer support)
* [inmotion](http://www.inmotionhosting.com)
* [Liquid Web](https://www.liquidweb.com)
* [Namecheap](https://www.namecheap.com)
* [OVH](https://www.ovh.co.uk)
* [Site5] (https://www.site5.com) (tools must be built manually, or contact Site5 support for assistance)
* [SiteGround](https://www.siteground.com)
* [Spry Servers](https://www.spryservers.net) (even with PHP 7)
* [WebFaction](https://www.webfaction.com)
* [1&1](https://www.1and1.com) (pngout requires manual upload and permissions fix)

Webhosts where the plugin will only work in cloud mode or only some tools are installed locally:

* Gandi
* Hostwinds
* ipage (JPG only)
* ipower
* Cloudways
* Flywheel
* WP Engine - use EWWW Image Optimizer Cloud fork: https://wordpress.org/plugins/ewww-image-optimizer-cloud/

== Frequently Asked Questions ==

= Google Pagespeed says my images need compressing or resizing, but I already optimized all my images. What do I do? =

Try this for starters: https://ewww.io/2014/12/05/pagespeed-says-my-images-need-more-work/

= The plugin complains that I'm missing something, what do I do? =

This article will walk you through installing the required tools (and the alternatives if installation does not work): https://ewww.io/2014/12/06/the-plugin-says-im-missing-something/

= Does the plugin replace existing images? =

Yes, but only if the optimized version is smaller. The plugin should NEVER create a larger image.

= Can I resize my images with this plugin? =

Yes, you can, set it up on the Advanced tab.

= Can I lower the compression setting for JPGs to save more space? =

The lossy optimization using the EWWW IO Cloud service will determine the ideal quality setting and save even more space. You cannot manually set the quality with this plugin, but Imsanity (and many others) will do that if you really want to. But you should REALLY try EWWW IO Cloud first.

= The bulk optimizer doesn't seem to be working, what can I do? =

If it doesn't seem to work at all, check for javascript problems using the developer console in Firefox or Chrome. If it is not working just on some images, you may need to increase the setting max_execution_time in your php.ini file. There are also other timeouts with Apache, and possibly other limitations of your webhost. If you've tried everything else, the last thing to look for is large PNG files. In my tests on a shared hosting setup, "large" is anything over 300 KB. You can first try decreasing the PNG optimization level in the settings. If that doesn't work, perhaps you ought to convert that PNG to JPG or set a max PNG optimization size. Screenshots are often done as PNG files, but that is a poor choice for anything with photographic elements.

= What are the supported operating systems? =

I've tested it on Windows (with Apache), Linux, Mac OSX, FreeBSD (8 and 9), and Solaris (v10). The cloud service will run on any OS.

= How are JPGs optimized? =

Lossless optimization is done with the command *jpegtran -copy all -optimize -progressive -outfile optimized-file original-file*. Optionally, the -copy switch gets the 'none' parameter if you choose to strip metadata from your JPGs on the options page. Lossy optimization is done using the outstanding TinyJPG and JPEGmini utilities.

= How are PNGs optimized? =

There are three parts (and all are optional). First, using the command *pngquant original-file*, then using the commands *pngout-static -s2 original-file* and *optipng -o2 original-file*. You can adjust the optimization levels for both tools on the settings page. Optipng is an automated derivative of pngcrush, which is another widely used png optimization utility. EWWW I.O. Cloud uses TinyPNG for 10% better lossy compression than standalone pngquant.

= How are GIFs optimized? =

Using the command *gifsicle -b -O3 --careful original file*. This is particularly useful for animated GIFs, and can also streamline your color palette. That said, if your GIF is not animated, you should strongly consider converting it to a PNG. PNG files are almost always smaller, they just don't do animations. The following command would do this for you on a Linux system with imagemagick: *convert somefile.gif somefile.png*

= I want to know more about image optimization, and why you chose these options/tools. =

That's not a question, but since I made it up, I'll answer it. See these resources:  
http://developer.yahoo.com/performance/rules.html#opt_images  
https://developers.google.com/speed/docs/best-practices/payload#CompressImages  
https://developers.google.com/speed/docs/insights/OptimizeImages

Pngout, TinyJPG/TinyPNG, JPEGmini, and Pngquant were recommended by EWWW IO users. Pngout (usually) optimizes better than Optipng, and best when they are used together. TinyJPG is the best lossy compression tool that I have found for JPG images. Pngquant is an excellent lossy optimizer for PNGs, and is one of the tools used by TinyPNG.

== Screenshots ==

1. Plugin settings page.
2. Additional optimize column added to media listing. You can see your savings, manually optimize individual images, and restore originals (converted only).
3. Bulk optimization page. You can optimize all your images at once and resume a previous bulk optimization. This is very useful for existing blogs that have lots of images.

== Changelog ==

* feature requests are sticky at the top of the support forums, vote for the ones you like: https://wordpress.org/support/plugin/ewww-image-optimizer
* If you would like to help translate this plugin in your language, get started here: https://translate.wordpress.org/projects/wp-plugins/ewww-image-optimizer/

= 2.9.6 =
* fixed: set_time_limit() was still being called in a couple spots even if set_time_limit() is disabled by PHP
* fixed: regression in scheduled optimization which allowed multiple processes to run
* fixed: total savings for multisite was incorrectly requerying site 1 for each blog
* fixed: optimization being attempted via API even if license exceeded
* added: ewwwio_images table is checked on settings page to make sure it exists
* added: run utf8_encode() on all filenames for Scheduled Optimize and Scan & Optimize to avoid database update issues, please report any new issues with Scan & Optimize right away

= 2.9.5 =
* fixed: wrong path pre-pended using parallel optimization and wp-content or uploads folder is not within the WP root
* fixed: absolute paths passed to async optimization are pre-pended with ABSPATH
* fixed: Bulk Optimize excluding images from count based on wrong option (disabled generation vs. disabled optimization)
* fixed: timeouts during Media optimize could corrupt metadata, added routine to rebuild the meta on re-optimization
* changed: running out of API credits puts the verification function to sleep for up to 5 minutes
* added: extra checks to make sure the Background/Async objects are properly initialized before using them

= 2.9.4 =
* fixed: permissions after optimization are different than what WP core uses and falls back to umask on unixy systems
* fixed: API server address not re-fetched properly when cache expires
* changed: Parallel Optimization no longer ON by default

= 2.9.3 =
* fixed: sorry, missed a session locking operation (manual optimize)

= 2.9.2 =
* changed: priority level of Alt WebP Rewriting so that pages do not get un-minified after Autoptimize runs
* fixed: async requests for parallel optimization had an empty user agent
* fixed: uploads broken because start_session() locks all async processes

= 2.9.1 =
* changed: full paths are not POSTed to avoid Local File Inclusion blocks put in place by various security plugins (Wordfence & Shield)
* fixed: reduced number of database queries during parallel optimization
* fixed: undefined methods for BFI thumb editor class
* added: detect Shield's Lock to Location feature and disable background/parallel operations

= 2.9.0 =
* added: parallel optimization for Media uploads (original and resizes are done concurrently), turn off under Advanced if it affects site performance
* added: allow resize dimensions to be filtered: https://ewww.io/2016/07/05/changing-the-dimensions-for-resizing-images/
* changed: deferred (background) optimization is now the normal mode of operation as it runs instantly, and no longer relies on wp_cron
* changed: scheduled optimization uses new background processing to allow it to run longer, and resume quicker
* changed: webp .htaccess rules removed when plugin is deleted
* changed: JPG quality setting applies to conversion AND image editing (but not regular optimization), so that you can override the WP default of 82
* changed: API license status check is faster, as results are cached while checking for updates in the background
* fixed: .htaccess rules for webp inserted properly for sub-directory installs
* fixed: .jpe files properly detected as image/jpeg when fetching from CDN or during folder-scanning operations
* fixed: images generated by NextGEN are properly optimized with latest version
* fixed: deprecated class constructors for NextGEN, Nextcellent, and FlaGallery classes (potential white screen with PHP 7)
* fixed: basic uploader for FlaGallery broken due to missing class
* fixed: images uploaded with WPML Media active are now resized, with better detection for newly uploaded images

= 2.8.5 =
* fixed: previous security hardening used boolval(), which is not present on PHP < 5.5

= 2.8.4 =
* security: remote command execution, please update immediately

= 2.8.3 =
* fixed: tool status not shown when tool could not be found, prevents pngout installation
* fixed: notice when checking nonce lifetime during scheduled optimization
* fixed: multi-site not saving cloud optimization levels
* fixed: settings page requiring a refresh to display properly after inserting/removing an API key

= 2.8.2 =
* added: ability to use ImageMagick's 'convert' tool to convert images on Windows
* fixed: WebP images regenerated during scheduled optimization when PNG optimization disabled
* fixed: Windows executable checks obey 'use system tools' option
* fixed: settings page checks for tools which have already been tested and known missing

= 2.8.1 =
* added: kudos to Cache Enabler plugin from KeyCDN for adding WebP rewrite support to work with images generated by EWWW I.O.
* fixed: untranslatable string for resize setting description
* fixed: Resize Media Images was not applying to the Media->Add New menu item
* fixed: Bulk Optimize counted webp images as valid resizes

= 2.8.0 =
* added: resizing for uploaded images, set max width and height and optionally resize all existing images
* added: retina derivative for resized original is generated if original was at least twice the size of the max dimensions (WP Retina 2x Pro only)
* fixed: warnings for file_exists in Alt WebP function when open_basedir restriction is in effect
* removed: disable automatic optimization, use deferred optimization instead
* removed: disable optipng (it still functions, just seeing if anyone actually needs that option anymore)
* changed: consolidated various settings into optimization levels for each file format, and removed Cloud tab

== Upgrade Notice ==

= 2.9.0 =
* changed: JPG quality setting applies to conversion AND image editing (but not regular optimization), so that you can override the WP default of 82 (it is NOT recommended to increase the quality)
* added: parallel optimization for Media uploads (original and resizes are done concurrently), turn off under Advanced if it affects site performance

= 2.8.4 =
* security fix: remote command execution, please update immediately

= 2.8.1 =
* KeyCDN added support for WebP images generated by EWWW I.O. into the Cache Enabler plugin. If you are using Cache Enabler, you may wish to use their WebP option instead of Alt WebP Rewriting. Works very nicely with CDNs and is a nice simple caching plugin.

= 2.8.0 =
* added: resizing for uploaded images, set max width and height and optionally resize all existing images
* changed: settings have been revamped, please check to make sure your settings were migrated properly

= 2.7.0 =
* added: PDF Optimization, both lossless AND lossy

== Contact and Credits ==

Written by [Shane Bishop](https://ewww.io). Based upon CW Image Optimizer, which was written by [Jacob Allred](http://www.jacoballred.com/) at [Corban Works, LLC](http://www.corbanworks.com/). CW Image Optimizer was based on WP Smush.it. Jpegtran is the work of the Independent JPEG Group.  
[Hammer](http://thenounproject.com/noun/hammer/#icon-No1306) designed by [John Caserta](http://thenounproject.com/johncaserta) from The Noun Project.  
[Images](http://thenounproject.com/noun/images/#icon-No22772) designed by [Simon Henrotte](http://thenounproject.com/Gizmodesbois) from The Noun Project.

= optipng =

Copyright (C) 2001-2014 Cosmin Truta and the Contributing Authors.
For the purpose of copyright and licensing, the list of Contributing
Authors is available in the accompanying AUTHORS file.

This software is provided 'as-is', without any express or implied
warranty.  In no event will the author(s) be held liable for any damages
arising from the use of this software.

= pngquant.c =

   © 1989, 1991 by Jef Poskanzer.

   Permission to use, copy, modify, and distribute this software and its
   documentation for any purpose and without fee is hereby granted, provided
   that the above copyright notice appear in all copies and that both that
   copyright notice and this permission notice appear in supporting
   documentation.  This software is provided "as is" without express or
   implied warranty.

= pngquant.c and rwpng.c/h =

   © 1997-2002 by Greg Roelofs; based on an idea by Stefan Schneider.
   © 2009-2014 by Kornel Lesiński.

   All rights reserved.

   Redistribution and use in source and binary forms, with or without modification,
   are permitted provided that the following conditions are met:

   1. Redistributions of source code must retain the above copyright notice,
      this list of conditions and the following disclaimer.

   2. Redistributions in binary form must reproduce the above copyright notice,
      this list of conditions and the following disclaimer in the documentation
      and/or other materials provided with the distribution.

   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
   AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
   FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
   SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
   CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

= WebP =

Copyright (c) 2010, Google Inc. All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

  * Redistributions of source code must retain the above copyright
    notice, this list of conditions and the following disclaimer.

  * Redistributions in binary form must reproduce the above copyright
    notice, this list of conditions and the following disclaimer in
    the documentation and/or other materials provided with the
    distribution.

  * Neither the name of Google nor the names of its contributors may
    be used to endorse or promote products derived from this software
    without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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