On Fri, 15 Jun 2001 12:54:57 -0700 Paul Chefurka
(Paul_Chefurka@pmc-sierra.com) wrote:
> So the question is: what factors would conspire to lower the
> resolution fractionally like that? The suspects I come up with are:
>
> - CCD bloom
inescapable, though the technology attempts to minimise it
> - An interaction between the analog detail on the neg and the discrete
> CCD pixels (leading to something like dither if I'm not mistaken)
D'you mean aliasing? This is a brick wall phenomenon : the point at which
aliasing occurs is the point at there is no meaningful resolution of the
target, just mush.
> - System noise
Shouldn't count for much in high-contrast tests used for MTF testing,
though the inherent contrast of the scanner system will affect results.
Of course they are testing the whole scanner system, presumably, including
its own lens. So optical losses like flare and aberrations will figure in
empirical results - and so they should, if they are to bear any relevance
to real-life use.
Regards
Tony Sleep
- Online portfolio & exhibit; + film scanner
info & comparisons
