Added sample files in my first post.
I should clarify: I'm placing code bounty on full-blown, proper Pull Request. So with KevinH blessing it can be merged with KindleUnpack codebase and be useful for the whole community.
Additionally: Can anybody confirm if PW3/Voyage use HD container at all? Last time I checked only Kindle Fire family used it.
Manga from Amazon Store is delivered to PW3 as
almost empty AZW3 file and all images are in separate AZW6. I can only guess that that AZW6 file is created from HD container of original upload.
If that is true my goal described in my first post might be wrong. In this case HD container should be left alone and all other non-cover images embedded in KF8 should be replaced with
Empty_Image/Resource_Placeholder.
Speculations... Only if I would have skills to check it myself :-P When somebody strip HQ container we will see if quality drop. That will answer if HQ container is used at all.