Re: Digital hard copy?
My own experiments with digital photography suggested that my eyes (*) could distinguish up to 4 pixels per millimetre when I was in my late 20s. So that's 16 bits per mm². On a sheet of A4 paper (210 x 297 mm.) with a 10 mm. margin all around (190 x 277; 52 630 mm²) there would be room for 842 080 pixels. That's 105 260 bytes, with no error-correction. If, however, we used red, yellow and blue inks, giving 8 distinct states, we could actually treble the information density.
(* I am short-sighted, which is roughly equivalent to looking at the world through convex lenses; your resolving power may vary.)
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If I have seen further than others, it is because I was standing on a pile of failed experiments.
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