Some questions regarding Oasis 2 & comics/manga

[jhowell]

Originally Posted by j.p.s

In the case of K4PC D/L, which file has the "enhanced typesetting" if the azw6 only has images?

Enhanced typesetting is a feature of KFX format and doesn't use azw3 or azw6 containers at all, although it splits up the content of the book in a somewhat similar fashion. There is a main KFX container with most of the book content and structure, a metadata container with the metadata and cover image, additional containers for font and image resources, and a DRM voucher with encryption keys.

There is another confusing aspect of this. Recent versions of Kindle for PC give book file names different extensions than were used previously. The extensions .azw3 or .azw6 no longer actually appear for those types of containers. The main file for each book has an .azw extension regardless of its type. And auxiliary resources, such as azw6 containers, now use the extension .azw.res. You now have to examine the file's contents to determine its actual type.

Originally Posted by ilovejedd

I've never tried but can K4PC transfer files to Kindle e-ink? Which version does it transfer? The azw3 with LQ images or azw3 text+azw6? If it's the former, then we can guess why they send two versions of images when downloading via desktop app.

Kindle for PC is not like iTunes. It is a stand-alone app and cannot transfer books to/from other apps or devices. For those books that have DRM (the majority of BPH published books), Amazon's DRM locks them so that they cannot be read if transferred elsewhere, even on devices registered to the same Amazon account.

[ilovejedd]

Originally Posted by jhowell

Kindle for PC is not like iTunes. It is a stand-alone app and cannot transfer books to/from other apps or devices. For those books that have DRM (the majority of BPH published books), Amazon's DRM locks them so that they cannot be read if transferred elsewhere, even on devices registered to the same Amazon account.

In that case, yep, downloading both low quality and high quality versions of images is an unnecessary waste.

Just installed K4PC on the laptop and similar to Naruto, for most of my manga, the lower quality images add 50% to the storage usage. Oh well, at least advantage is the LQ versions still work with Alf's tools.

[ilovejedd]

Originally Posted by jhowell

Yes they are downloaded together. The azw3 has the main structure of the book and lower quality images. The azw6 just has the better quality images and only works in conjunction with the azw3.

This is oddly wasteful. The azw3 really doesn’t need to have any image at all since the ones from the azw6 are actually used. The combination I would expect of azw3 without images along with an azw6 is sometimes seen on Kindle devices.

Note:

I found a script that dumps the contents of azw6 files here.

It seems like not all images are stored in the azw6 file. Just the ones where there are higher quality versions. On one of the manga I tried unpacking, the azw6 only contained 144 images while the azw3 had 193 images.

I do wonder why they went the azw3+azw6 route instead of just going with the HQ images in the first place, though. Granted, I guess KFX remedies that.

[jhowell]

Originally Posted by ilovejedd

It seems like not all images are stored in the azw6 file. Just the ones where there are higher quality versions.

Thanks for pointing that out.

The Amazon ecosystem complicated and I am always learning new things about how it works.