1) No. Some of the books are 3 years old, when CreateSpace started doing books.
I have 189 of them, and the drive space required to keep all intermediary files wasn't part of the budget then. 50 images 300DPI, 50 page idd, 50 page pdf, 50 page Optimized pdf, 50 page reduced pdf, Cover idd, cover pdf, cover Optimized pdf, Cover Optimized Reduced pdf, Interior pdf inserted in Cover pdf.
2) The PDFs work fine in Kindle.
You answer doesn't pertain to the question: "Why inverse?". Calibre makes the images inverse or negative.
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