Mass Removal of JPEG while keeping PNG?

nemu · 08-23-2017, 03:43 AM

How to remove all JPG but keep PNG of a EPUB? Maybe there is a way to access the EBUP folder to mass delete the JPG files?

Additional Info
- I am able to manually remove the JPG, I just would like to do it faster.
- File is an DRM-free EPUB
- I am using calibre 3.6 on OS X 10.11 El Capitan
- The PNG contain useful diagramms while the JPG contain additional fotos, which I don’t need and just use a lot of space. I am already using caliber’s image compression feature.

I haven’t found this specific topic in the documentation nor in previous posts, but if I have missed it please link to it. Thank you for the mobileread and Calibe communities. They add a lot of value to my life.

kovidgoyal · 08-23-2017, 04:29 AM

Use the unpack book tool in calibre which will give you a folder on your filesystem witht he files from the epub. Use whtever tools you want to delete the jpegs, then rebuild.

nemu · 08-23-2017, 05:06 AM

Thanks Kovid, it worked!

Below the detailed how to for my self and others in the future:
1. Optional: Move all images into one folder
Edit Book => Tools - Arrange into folders

2. Press "U" to start unpack tool
Explode book, go into "images", sort by kind, deleted unwanted files, Rebuild book

08-23-2017, 03:43 AM	#1
nemu Junior Member Posts: 2 Karma: 10 Join Date: Aug 2017 Device: Kindle Paperwhite	Mass Removal of JPEG while keeping PNG? How to remove all JPG but keep PNG of a EPUB? Maybe there is a way to access the EBUP folder to mass delete the JPG files? Additional Info - I am able to manually remove the JPG, I just would like to do it faster. - File is an DRM-free EPUB - I am using calibre 3.6 on OS X 10.11 El Capitan - The PNG contain useful diagramms while the JPG contain additional fotos, which I don’t need and just use a lot of space. I am already using caliber’s image compression feature. I haven’t found this specific topic in the documentation nor in previous posts, but if I have missed it please link to it. Thank you for the mobileread and Calibe communities. They add a lot of value to my life.

08-23-2017, 05:06 AM	#3
nemu Junior Member Posts: 2 Karma: 10 Join Date: Aug 2017 Device: Kindle Paperwhite	It worked! Details bewlow Thanks Kovid, it worked! Below the detailed how to for my self and others in the future: 1. Optional: Move all images into one folder Edit Book => Tools - Arrange into folders 2. Press "U" to start unpack tool Explode book, go into "images", sort by kind, deleted unwanted files, Rebuild book

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Convert SVG to PNG/JPEG in ePUB files	bunglegrind	Conversion	2	04-24-2016 05:01 PM
Inserting a jpeg into a PM	Lynx-lynx	Feedback	11	12-24-2014 06:17 AM
Conversion to jpeg/png	Fallingwater	Calibre	4	07-31-2013 08:15 AM
convert png & jpeg into wmv or mp3; Manga for my phone	Johnnyjohn	Introduce Yourself	6	08-06-2010 01:51 PM
where to get autorun.xml, icon.png, key.png, lut.bin for PRS-505	obender	Sony Reader Dev Corner	2	01-25-2009 03:20 PM

08-23-2017, 04:29 AM	#2
kovidgoyal creator of calibre Posts: 43,850 Karma: 22666666 Join Date: Oct 2006 Location: Mumbai, India Device: Various	Use the unpack book tool in calibre which will give you a folder on your filesystem witht he files from the epub. Use whtever tools you want to delete the jpegs, then rebuild.