Okay, yeah, I follow you on the compression issue. From my pov there are simply two different versions of the same images being passed through Kindlegen, one set that is untouched, and the other that is modified. The use of the term compressed seemed obvious to me to describe what has happened to the smaller images, since Kindlegen used this term itself. But I see your point quite clearly. My bad.
But your error with regard to the anomaly of missing images is in assuming that this is occurring in the software, and thus rightly a bug. But that is an unknown. The pipeline follows a long and tortuous route long before it get to KindleUnpack, or even Kindlegen, for that matter. Using my previous example, if a sunspot causes a disruption of data flow during wireless transmission of a file from Amazon to my Kindle device, and that file is then unpacked, this is not a bug, but an anomaly, caused by a completely random event that cannot be replicated. But as we do not know the cause of data loss, it may be a bug in the software, or maybe the images were never in there in the first place.
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