RE: [APML]: PhotoCD v Sprintscan

[Axel Mellinger <axm2@canopus.physik.uni-potsdam.de>]

The Astro-Photography Mailing List
------------------------------------

On Thu, 30 Jul 1998, Jerry Lodriguss wrote:

> I'm pretty sure the Photo CD scans are 2k x 3k that produce an 18mb file, a
> lower resolution than the sprintscan.
> 
> However, I don't believe, and I think Chuck agrees with me, that you are
> scanning the film's grain at either of these resolutions.  The resolution
> is just not high enough.
> 

Hi all,

I am seriously thinking about purchasing a film scanner, and have been
reading Philip Perkins' comparison between PhotoCD and the Polaroid
Sprintscan with great interest. I am wondering whether the 'noise' in the
Sprintscan image is reproducible (i.e. two scans of the same negatives
look exactcly the same). If not, we are indeed dealing with random noise
from the Sprintscan, which could be suppressed by scanning the same
negative a couple of times and average the images.

As for the film grain, does anybody have information on the grain size of
PJM-2 film? It seems to me that at 2700 dpi (=106 lines/mm), the
Sprintscan should be able to resolve the grain of high speed films.
Tech Pan is another matter, of course.

Any comments are welcome (I still need some good reasons to spend
my money on such an obscure device ;-)

Axel


-- 
Axel Mellinger  <http://canopus.physik.uni-potsdam.de/~axm/astrophot.html>