As I can't really provide a way of cutting white borders around images, I changed a bit the "lock image size" feature.
You can change image size using "change image size", then use swipe gestures to move around the image to center it in the kindle screen.
Finally, tap on "lock image size" to set the size you choosed as default image size and to save image position in the screen as default.
This means you can go next/previous/jump to and you'll see always the image at the same size and in the same position (i.e: you won't see white borders!).
Screenshots are easier to understand: first image is the original, the second image is with size changed and image centered. If lock, you'll always see the image like the second one (until you unlock or change folder!)
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