In article , Andrew
writes
What's the resolution of photo paper? Googling for terms
such as dpi and noritsu, I came across marketing claims
from minilab manufacturers claiming 400 and 500 dpi. Is the
the current bottleneck the paper or the equipment used to
project light onto the paper?

What do you mean by "photo paper"? From the words, I would take it to
mean traditional light-sensitive emulsion coated paper; for this,
maximum resolution is probably around 60-70 lp/mm - and this for good
B&W papers, most colour neg/pos paper would probably be lower.

Note however that 60-70 lp/mm is way in excess of what the keenest human
eye can detect; that limit is closer to 30 lp/mm.

If you mean inkjet paper, I don't know, but I suspect the printer has
more control over this than the paper - not that the paper has no
influence.

David
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David Littlewood