On Sun, 16 Sep 2001 00:51:38 +0800 SM (straumr@yahoo.com) wrote:
> 1. I notice that profiled images exhibit more "noise" and uneven
> textures when examined closely, especially in darker slides/areas. Is
> this expected of Wiziwyg profiles? Is there any way around this?
I doubt this is anything to do with Wiziwyg, but is probably indicative of
the profiles needing to apply corrections to the data which are large
enough to reveal the shortcomings of the scanner hardware. I have seen
similar when trying to get better results by tweaking manually, on a couple
of other models of scanner. Really a better scanner is the only solution
if that's the problem. However!....
> 2. For profiling the scanner, I set the scanner to a stable and fixed
> condition (via Vuescan) and feed the image clean into the profiling
> program. Do we usually have to set black/white points before profiling?
> If so, how should be go about this?
Yes I would expect you should ideally set B&W points. If you don't that
might account for the faults you are seeing above, as the profile is having
to expand the wanted range from the whole, unclipped range. Possibly not,
though, as Velvia is going to be close to, or beyond the ODR available.
However I don't know the s/w and how it would want you to set B&W points
anyhow.
Regards
Tony Sleep
- Online portfolio & exhibit; + film scanner info
& comparisons
