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Old 01-22-2023, 12:58 PM   #722
DuckieTigger
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Posts: 4,764
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Join Date: Dec 2011
Location: USA
Device: Oasis 3, Oasis 2, PW3, PW1, KT
Quote:
Originally Posted by DuckieTigger View Post
Quote:
Originally Posted by jhowell View Post
Images being split off into a separate AZW6 file when delivered to Kindle devices is not a new thing. It was first seen almost ten years ago in late 2013. In retrospect it was a precursor to KFX format which uses B/W JPEG-XR images split into a separate container when delivered to Kindle devices.

Because it is only used for a relatively small number of image-heavy books, handling AZW6 has not been a major priority. A method for combining the AZW6 and AZW3 files into a single AZW3 has been requested over the years for KindleUnpack and calibre, but those requests were rejected. A pull request to add that capability to the DeDRM plugin was rejected because it is not a DRM-related issue.

An AZW6 Image Merge plugin was created for calibre in 2021. However it only handles combining file downloaded using the Kindle for PC app, not an e-ink Kindle. The author of that plugin is still active on MobileRead. Perhaps they could be convinced to add handling for Kindle devices.

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Amazon creates different format variants of each book for delivery to different Kindle reading platforms. I took a look at the Feral book on some different model Kindles to see how they compare.

Download & Transfer: 2.17MB AZW3 file with color JPEG images

3rd gen Kindle Keyboard: same as Download & Transfer

5th gen Paperwhite 1: 678KB AZW3 + 958KB AZW6 with B/W JPEG-XR images

9th gen Oasis 2: 1.5MB KFX with B/W JPEG-XR images

Kindle for PC 1.39: 33.1MB KFX with high resolution color images

So in the end the quality of the book you receive varies greatly according to the device for which it is downloaded.
Interesting. I shall try again on my KT, and see if it behaves the same as Kindle Keyboard 3. If true, the KT might be the newest suggested old Kindle for removing DRM, especially as it possibly is the last Kindle incapable of the azw3/azw6 split.
Success, the Kindle Touch does work just like the Kindle Keyboard 3. It is the newest device that will get you same as Download and Transfer via USB file that can be moved into Calibre directy - plus the books not yet in library on computer are really easy to see as they don't have the checkmark for being in library.
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