[Plugin] JPEGOptimizer - Lossless image optimization

Doitsu · 10-28-2021, 11:27 AM

Released: November 26, 2021
Current Version: "0.0.3"

This plugin uses the jpegoptim command line utility to losslessly reduce the size of JPEG files.

Disclaimer: Since this plugin will replace the images in your ebook with optimized images, you might want to save your ePub or create a checkpoint before running this plugin.

Credits

BeckyEbook created the plugin icon, and KevinH provided the macOS binary.

System requirements

This plugin requires at least Sigil 0.9.8. If you uncheck the Use Bundled Python option, you'll also need to install Python 3. Linux users will also need to install the jpegoptim package (Debian, Arch).

Installation

1. Select Manage Plugins from the Plugins menu and enable the Use Bundled Python option, if it isn't already enabled (or greyed out).
2. Click Add Plugin and select JPEGOptimizer_v0.0.3.zip. This will install the plugin, which you can select via Plugins > Edit > JPEGOptimizer.

Settings

To turn on lossy optimization, edit JPEGOptimizer.json and change the quality value. For example:

Code:

  "quality": 80,

To display the folder that contains JPEGOptimizer.json select Edit > Preferences > Open Preferences Location. Then double-click plugins_prefs and JPEGOptimizer.
Windows users can also press WIN+R, paste %localappdata%\sigil-ebook\sigil\plugins_prefs\JPEGOptimizer into the Run dialog box and hit Enter.

License: GNU General Public License v3 (GPL-3)

DNSB · 10-28-2021, 12:31 PM

I gave the plugin a quick try and it worked well. Very nice.

DiapDealer · 10-28-2021, 03:37 PM

Added to the plugin index. Thanks!

Vanguard3000 · 12-05-2022, 05:06 PM

Hi, I'm really liking this plugin; it's part of my workflow now for all new ebooks. I don't suppose there's something like this that can handle bulk epub processing? I was thinking there may have been something similar as a Calibre plugin or standalone but I can't find anything like it.

Doitsu · 12-06-2022, 01:19 AM

Quote:

Originally Posted by Vanguard3000

I don't suppose there's something like this that can handle bulk epub processing?

You could use the Calibre Polish books tool for this.

Vanguard3000 · 12-06-2022, 12:03 PM

Quote:

Originally Posted by Doitsu

You could use the Calibre Polish books tool for this.

Perfect, that's exactly what I was looking for. Thanks!

10-28-2021, 12:31 PM	#2
DNSB Bibliophagist Posts: 35,464 Karma: 145525534 Join Date: Jul 2010 Location: Vancouver Device: Kobo Sage, Forma, Clara HD, Lenovo M8 FHD, Paperwhite 4, Tolino epos	I gave the plugin a quick try and it worked well. Very nice. Last edited by DNSB; 10-28-2021 at 05:04 PM. Reason: Removed comment on release date in November

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Is it possible to add image file via plugin?	nirosan	Plugins	7	05-25-2019 12:38 AM
Strange behavior of image lossless compression since it has been "fixed"	Francois_C	Editor	2	05-18-2018 03:23 AM
Calibre plugin image resources	jackie_w	Development	10	10-27-2015 02:01 PM
Using image in plugin code	Jellby	Development	7	03-11-2014 10:56 PM
Image optimization for Kindle 2	thelostemperor	Amazon Kindle	10	03-13-2009 05:34 PM

10-28-2021, 03:37 PM	#3
DiapDealer Grand Sorcerer Posts: 27,552 Karma: 193191846 Join Date: Jan 2010 Device: Nexus 7, Kindle Fire HD	Added to the plugin index. Thanks!

12-05-2022, 05:06 PM	#4
Vanguard3000 Groupie Posts: 152 Karma: 474196 Join Date: Jan 2011 Location: Ottawa Device: Kobo Aura H2O	Hi, I'm really liking this plugin; it's part of my workflow now for all new ebooks. I don't suppose there's something like this that can handle bulk epub processing? I was thinking there may have been something similar as a Calibre plugin or standalone but I can't find anything like it.