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Still haven't heard back from my contact. But I did an experiment with KDP.
For the book we're releasing next week, I made a KDP-only version with images 1200 pixels wide. I made both a version with PNGs and a version with GIFs. (The only difference is the file format; neither has transparency, etc.) Then I uploaded them and let them process. Here are the results.
PNG version:
4.3 MB
After conversion: 4.28 MB
Delivery fee: $0.64
GIF version:
4.6 MB
After conversion: 3.83 MB
Delivery fee: $0.57
I wonder why the larger file came out smaller...
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