Thread: Aura ONE Kobo Aura One owners thread
View Single Post
Old 01-29-2017, 12:41 AM   #1098
davidfor
Grand Sorcerer
davidfor ought to be getting tired of karma fortunes by now.davidfor ought to be getting tired of karma fortunes by now.davidfor ought to be getting tired of karma fortunes by now.davidfor ought to be getting tired of karma fortunes by now.davidfor ought to be getting tired of karma fortunes by now.davidfor ought to be getting tired of karma fortunes by now.davidfor ought to be getting tired of karma fortunes by now.davidfor ought to be getting tired of karma fortunes by now.davidfor ought to be getting tired of karma fortunes by now.davidfor ought to be getting tired of karma fortunes by now.davidfor ought to be getting tired of karma fortunes by now.
 
Posts: 24,905
Karma: 47303824
Join Date: Jul 2011
Location: Sydney, Australia
Device: Kobo:Touch,Glo, AuraH2O, GloHD,AuraONE, ClaraHD, Libra H2O; tolinoepos
Quote:
Originally Posted by Mingyar View Post
To be sure the Kobo has generated all the covers, you have to scroll all pages in list view of your library.
For each book, if I'm right, Kobo fw generates 4 files for the cover.

I can't answer you for the size of the covers in all my books. I just can say I did this test :
1) Load 4000 books in the Kobo by Calibre,
2) Get free memory in technical parameters
3) In list view mode, display the 667 pages of 6 books per page.
4) Get again free memory.
Result, 3 Go lost.
Sorry, you are wrong. Firstly, recent firmware only uses three sizes for the cover image. There was a fourth used for a while, but they stopped using that ages ago.

The images are generated as needed. And only the sizes needed are generated. Paging through the list will only generate one size. If you open a book, then the largest size will be generated. The third size is used when you view the details page for the book. And it is only generated when you open the details page.

If you are using calibre to send the books, have you configured the driver to send the covers as well? With this turned on, it will generate all three covers images (or four for the appropriate firmware) and put them on the device. This could have been using more space up until the latest version of calibre. In the past, the cover was sent unchanged for the largest version used as the screensaver. This worked, as the device resized when displaying the screensaver. But, it wasted space and didn't match what Kobo did for downloaded books. If you want to reclaim some space, you can use my Kobo Utilites plugin to resend the covers with the new sizing. Or simply delete all the covers images and let the device regenerate them as needed.

(Hmm, I should add an option to the cover delete to only delete the screensaver cover. That way space could be reclaimed for books that have been finished but are still on the device)
Last edited by davidfor; 01-29-2017 at 12:47 AM. Reason: I make no claims to being able to spell.
davidfor is offline   Reply With Quote