Scan Quality

[Cedric48]

I have just received an advertisement on my phoe]ne for Adobe Scan App, so hopefully this is a good time to explore the reason I ditched it when I first tried it.

Can anyone tell ne what quality image PDF I will get if I scan an A4 page with my phone, and first make sure the page nearly fills the camera's field of view, and the camera is at right angles to the page?  Could you please express that in DPI or pixels/inch.  Will it be as sharp an image as my scanner that I usually set at 300DPI?

I would have Adobe scan installed on a Nokia 6.1 running Android 10, I believe it has a 16MP camera.  My previous try of adobe scan was on an LG Nexus 5X running Android 8.1.0 which apparently has a 12.3MP camera.

[Cedric48]

Having looked at this again, I see that an A4 page scanned at 300 DPI has ~8.5 million piixels.

The Nokia takes photos containing 3456*4608 pixels, or almost 16 million.  So why does a scan using Adobe Scan, of an A4 page look much poorer quality than the scan using the flatbed scanner (an old Epson Perfection v500).

Do I need to change some settings from default?

I see someone has posted that the CamScanner App works better out of the box, is it just a case of the Apps design, or are there ways of using it that can also improve results?