Possible to extract high resolution b/w from a raw file?

In article

, David Dyer-Bennet wrote:
Exactly the same is true of aliasing. People seem to spend more time
discussing it than dealing with it. The result is that most DSLRs are
fitted with anti-alias filters that they really don't ned.

they definitely need them or they wouldn't be there. do you think the
manufacturers put them in just for the hell of it? they aren't all that
cheap.

Some have them, some don't. The general pattern seems to be that
all amateur gear has them, but high end professional gear is more
mixed. By sales, only a tiny percentage lack AA filters -- but they're
among the most expensive, bought by the most expert photographers with
the most extreme requirements.

they all have an anti-alias filter (or equivalent) except for niche
cameras like sigma or medium format where it's actually needed but
would be cost prohibitive. low end cameras rely on diffraction and/or a
crappy lens in lieu of an anti-alias filter (e.g., cellphone camera) to
bandlimit the detail.

Which makes perfect sense. Many photographers need the image to come
out of the camera in essentially final form; they have no time or
patience for post-processing.

all the more reason to have an anti-alias filter. without one,
photographers would need to deal with minimizing jaggies and other
artifacts in post-processing.

Some photographers do highly critical,
slow, carefully-controlled work, and they need the least possible
between them and the light; and are willing to understand and work with
issues like aliasing when they come up. (The Leica M9 and most of the
medium-format digital gear has no AA filter.)

having the least possible between the subject and sensor is the
ridiculous the leica rationalization, and it's why they skipped the
infrared filter in the m8 too which turned out to bite them in the ass.

you *can't* fix aliasing afterwards without affecting the actual image.
once the image has been captured, there's no way to discern between
alias artifacts and real detail. remove one and you remove the other.

I have to say that your implication that all commercial product designs
are optimal strikes me as absurd.

everything has tradeoffs.