On Thu, 11 Jan 2001 13:06:00 +1100 Julian Robinson ([EMAIL PROTECTED])
wrote:
> My conclusion from all this is that the manufacturers cheat by saying that
> the Dmax is defined by the D/A resolution as a shorthand, which is true if
> the IMPLICATION which follows is that the rest of the system is engineered
> so that the whole of the D/A range is useful - that is, that the noise
> level is significantly less than one LSB. I don't think that this implied
> design constraint is true, at least in the case of consumer/semi-pro scanners.
Yup. It's self-evidently not, else we'd not see any noise, whereas with most
scanners we see rather more than we'd like, at least until cancellation by
multiscanning is applied. Hopefully, these are very good scanners, and there's no
reason to think they aren't. But Nikon's figures, unqualified as they are, tell us
absolutely nothing useful at all, except that someone in marketing thinks we're a
bit gullible. Of course if they read lists like this, they'd know better :)
Regards
Tony Sleep
http://www.halftone.co.uk - Online portfolio & exhibit; + film scanner info &
comparisons
