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I have an old Kindle e-reader that I can barely read anymore. The text is not black anymore but light gray. There is no fix for it as it's simply a worn-out display. The earlier virtual paper displays had a finite lifetime of about 2500 hours I learned from doing research.
I bought a Kindle Paperwhite to replace it. I guess it will also wear out but hopefully technology has extended the time before it fades into oblivion.
All areas outside of the document will be black only. I don't know how you were getting white background.
If you want white background around your scanned image, a) stick the check (in this example) onto a white paper and scan the whole sheet. Ensure double detection is off. b) You can also do this in software, by cropping a larger area outside the scanned image.
There are many options to view the scanned image like Actual size or Fit or Fit vertically or Fit width. The same image will appear different in each case.
you will find if you reduce the dpi the scanner is scanning the pictures or documents in, that you will not get a grey background , as you describe, what it is printing is actually the paper itself, if you have it set for say 1200 dpi then reduce it to 600 dpi or even 300 dpi and you will see the difference when you print it or only select the exact area you want to scan in the document, click preview then move the scan area selection box to exactly fit the picture you want to scan