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@badbob001 - I made some additional experiments and I sustain my opinion. Kindle build-in upscaling cause more image blurring than upscaling during conversion. Additionally I did not notice any speed difference between upscaling images with and without margins embedded to image file.
Not tested that on Voyage - It might be not so visible due better DPI. But both Paperwhite and Keyboard models are affected. Quality drop is just unacceptable for me.
I checked numbers and I admit that replacing white/black margins directly in image file with white/black background on HTML level will decrease output file size. It would require major changes in conversion process. I need conduct more test and make sure that file size drop is worth this refactoring.
If you have any other ideas how to improve KCC - I'm all ears.
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