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So. I've just spent a few days optimizing a new book for putting it on KDP. Got it down to a 7.5 MB epub.
I ran it through Kindle Previewer and saved the kpf file. Then I used jhowell's Calibre plugin KFX Import to extract the resources on the command line. And (without the embedded epub file) it's 32.4 MB. Is that an at all accurate predictor of what file size will be delivered to customers?
All of my carefully optimized gif files were changed to jpegs. The dimensions did not change, but the size ballooned. My biggest gif (the title page), 281 KB, became a 1.6 MB jpeg.
My biggest chapter icon, 100 KB, turned into 875 KB. My smallest one, 10 KB, turned into 67 KB. And there are 64 chapters.
After doing this, I tried it again with the regular ePub file that has pngs instead of gifs. The result was the same—all the pngs changed to huge jpegs.
I really hope this is not indicative of what the delivery size will be.
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