MobileRead Forums
Register Guidelines E-Books Today's Posts Search

Go Back   MobileRead Forums > E-Book Software > Calibre > Library Management
Reload this Page compress multiple images

Notices

Reply
 
Thread Tools Search this Thread
Old 04-05-2025, 10:53 AM   #1
gianni_1
Connoisseur
gianni_1 began at the beginning.
 
Posts: 85
Karma: 10
Join Date: Nov 2015
Device: tablet
compress multiple images
Hi,
Does anyone know if there is a way to compress all the .jpg images of all the selected books to a certain percentage?
Hi and thanks.
gianni_1 is offline   Reply With Quote
Old 04-05-2025, 12:28 PM   #2
PeterT
Grand Sorcerer
PeterT ought to be getting tired of karma fortunes by now.PeterT ought to be getting tired of karma fortunes by now.PeterT ought to be getting tired of karma fortunes by now.PeterT ought to be getting tired of karma fortunes by now.PeterT ought to be getting tired of karma fortunes by now.PeterT ought to be getting tired of karma fortunes by now.PeterT ought to be getting tired of karma fortunes by now.PeterT ought to be getting tired of karma fortunes by now.PeterT ought to be getting tired of karma fortunes by now.PeterT ought to be getting tired of karma fortunes by now.PeterT ought to be getting tired of karma fortunes by now.
 
Posts: 13,474
Karma: 78910112
Join Date: Nov 2007
Location: Toronto
Device: Libra H2O, Libra Colour
Does Bulk Image Resizer Plugin help?
PeterT is offline   Reply With Quote
Advert
Old 04-08-2025, 10:31 AM   #3
fogice
Addict
fogice possesses cleverness exceeding the boundaries of Space and Timefogice possesses cleverness exceeding the boundaries of Space and Timefogice possesses cleverness exceeding the boundaries of Space and Timefogice possesses cleverness exceeding the boundaries of Space and Timefogice possesses cleverness exceeding the boundaries of Space and Timefogice possesses cleverness exceeding the boundaries of Space and Timefogice possesses cleverness exceeding the boundaries of Space and Timefogice possesses cleverness exceeding the boundaries of Space and Timefogice possesses cleverness exceeding the boundaries of Space and Timefogice possesses cleverness exceeding the boundaries of Space and Timefogice possesses cleverness exceeding the boundaries of Space and Time
 
Posts: 254
Karma: 49504
Join Date: May 2014
Device: Kobo Libra 2
Open the Book Editor.

Tools > Compress images losslessly

Check the box "Allow lossy compression of JPEG images" and select your percentage.
fogice is offline   Reply With Quote
Old 04-08-2025, 09:38 PM   #4
capink
Wizard
capink ought to be getting tired of karma fortunes by now.capink ought to be getting tired of karma fortunes by now.capink ought to be getting tired of karma fortunes by now.capink ought to be getting tired of karma fortunes by now.capink ought to be getting tired of karma fortunes by now.capink ought to be getting tired of karma fortunes by now.capink ought to be getting tired of karma fortunes by now.capink ought to be getting tired of karma fortunes by now.capink ought to be getting tired of karma fortunes by now.capink ought to be getting tired of karma fortunes by now.capink ought to be getting tired of karma fortunes by now.
 
Posts: 1,195
Karma: 1995558
Join Date: Aug 2015
Device: Kindle
Quote:
Originally Posted by capink View Post
A combination of Editor Chains and Action Chains lets you perform lossy compression on multiple books.

In Editor Chains, there is a an action called "Compress Images", that enables you to automate this process. You can use the Action Chains to run this for multiple books. (chain in first attachment).

If you want to use an external tool to for lossy compression, e.g. ImageMagick, which can help convert png to jpg, you can use the Run Command action which will iterate over all images in an epub. See this post and screenshots for more details. (chain in second attachment). Note however, that you might need to edit the chain to configure the path to ImageMagick on your system.

To import the attached chains: Action Chains > Add/Modify chains > right click the chains table > import > browse to the zip file.

Note: I have found the ImageMagick approach to be much faster with lossy compression compared to the first approach that uses the editor's "Compress Images". Test with both and see which is more satisfactory.
sample chains are attached to the quotes post.
capink is offline   Reply With Quote
Reply

« Previous Thread | Next Thread »

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Compress images endemion06463 Conversion 18 04-23-2024 04:55 AM
How to compress pdf file which contains high resolution images. rupeshforu3 PDF 7 12-05-2021 07:59 AM
Compress images losslessly jlynton Calibre 9 04-21-2021 04:16 PM
Batch mode to compress images pmichelazzo Editor 2 06-17-2018 04:33 AM
No glyph available error and cannot compress png images crouton Editor 1 01-06-2017 10:02 PM


All times are GMT -4. The time now is 10:53 PM.

Contact Us - FAQ - Guidelines - Privacy - Top

MobileRead.com is a privately owned, operated and funded community.