No problem with being a control freak!
So, would you judge the final quality of the image editing purely visually, or do you have a rule of thumb (eg. file size change) for determining whether an image will print well? I'm producing a 200-page book with c100 images of natural history, so quality is important.
I'm also surprised that, even using he method you recommended (great to apply, thanks) when I then take the correctly sized image into QXP, I still have to reduce to say 30% to fit the image box. (eg. I've changed document size to 100mm wide, at 300dpi using Affinity Photo, then import it to a 100mm wide box in QXP and it comes in as say 72dpi but resizes to 300mm when reduced in dimension to fit the box).
Any comment, anyone?