I think it will depend on how the images are displayed in book. Most seem to have an img tag. That can have the sizing and positioning in the tag. Or there could be a class for each image to set the size. The image could also be wrapped in SVG tags to display. Whichever is used, changing the sizes seems to work. Of course, the only "testing" I have done for this is when I get the numbers wrong, usually swapped, and the image is display incorrectly.
The extended driver won't be able to do this. I don't know if a conversion could. I'd probably open the epub in the editor and change them manually. I don't think there is a way to do it automatically there.
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