Quote:
Originally Posted by u238110
No, I'm going to be custom scanning all the images of the book. And I want the scan output to be the final size. I don't want to compromise the integrity of my images by interpolating them.
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Let me then insist: I think this is the wrong choice. Scanning at higher resolution and then downscaling will very likely give you a better result than scanning at the reduced resolution directly. Besides, if you scan at a higher resolution, you can:
- Rotate, de-skew, crop the image.
- De-speckle, clean noise, adjust colors, remove spine shadows.
- Fix print errors, creases, holes, rips, etc.
all of these
before downscaling, so that the traces of your actions will be much less noticeable after that.
Additionally, my advice is to save a copy of the initial unmodified scan and the high resolution modified version just before downscaling. If you later (or some else) want to try a different postprocessing, or if much higher device resolutions become common, you wouldn't have to start from scratch.
But if you want a quick and dirty job, you can probably assume the device resolution will be something around 200dpi, so if you want the display size to be the same, scan at 200dpi (if you want the ebook to be 50% smaller, scan at 100dpi, and so on).