[ProDigit]

4 greyscales, does that mean:
1- White
2- Light grey
3- Dark grey
4- Black ?

or:

1- White, 2- Light grey, 3- medium light grey, 4- Medium dark grey, 5- Dark grey, 6- Black
?

Do you think 4 grey colors are enough or should I go with a 100$ more expensive 8 grey color model?

I use pdf format books with pictures.

The more grey tints can be displayed (like e.g.:8 or 16 tints), do you find it it annoying to read old scanned books where the paper appears with smaller light grey stains?

I have some books I want to scan and bring to the device.

Thank you.