On Tue, 18 Sep 2001 14:39:05 -0400, Aaron Reynolds wrote:
> Even so, I made a record-sized version of the cover (I'm old-school
> enough that I size my CD jackets so that I can print an excellent 12x12
> should the need arise), on which I could detect no moire pattern, even
> though I was certainly laying pattern over pattern -- Delta 3200
> magnified over Delta 3200.
Moire patterns will only be recognizable if all of the "layers" have
_regular_ repetitious patterns that are different. For example, mix a
200 dpi scan with a 300 dpi scan, and you'll get an easily recognizable
moire pattern. Film, however, has a stochastic ("random", sort of)
pattern that is not at all regular (except statistically) so it
shouldn't exhibit moire patterns large enough for the human eye to
detect except under extreme magnification. There will be "edge
effects" at the points that pixel edges intersect grain edges, but
these "edge effects" are (1) extremely small in area and (2) different
from each other, so they don't appear to the eye as an extended
pattern.
Or so I've been told. :-)
TTYL, DougF
-
This message is from the Pentax-Discuss Mail List. To unsubscribe,
go to http://www.pdml.net and follow the directions. Don't forget to
visit the Pentax Users' Gallery at http://pug.komkon.org .
