Quote:
Originally Posted by theducks
 You can resize/rotate any image inside the book, using the Calibre Editor.
double click on the image file name in the book browse or the embedded link on the page it is used) |
It's not a matter of editing the image (I use GIMP, Paint.net, etc. to do that), it is that an extra cover image is being added to the epub when it is sent from Calibre to my Kobo. For instance, I sent a 1.45MB epub (of which 740K was the cover image). It arrived on my Kobo weighing in at 2.17MB. That size was checked before I disconnected the Kobo so no processing by the Kobo.
The trigger for noticing this? I have ~2800 ebooks on my KA1. When I looked at the storage statistic, over 1GB more than expected had been consumed. Comparing the size of epubs in the eLibrary folder on the KA1 (where I store sideloaded epubs) to the total size of the epubs in my Calibre_KA1 Calibre library (I copy the books transferred to the KA1 from their home library to the KA1 library to make it easier to recover from a factory reset or decision to do a clean install), I was struck by the fact that the epubs in the eLibrary directory on the Kobo consumed ~1GB more space. Even worse--for me--was that when I opened several of the files in 7Zip,they had an extra OEBPS directory nested in the original OEBPS directory. If I open the modified epub in Sigil, it "corrects" the issue and I end up with cover.jpg and cov0001.jpg in the Images directory.
I really wouldn't care except that the KA1 does not have an external uSD card so I currently show 1.2GB free of 6.7GB total. On my H2O, which has quite a few more books, the total wasted space is about 2.7GB on a 32GB uSD card leaving me with ~15GB free on the uSD card.