Archived posting to the Leica Users Group, 1999/09/24

[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]

Subject: Re: [Leica] Re: Low Pressure Sodium
From: "Anthony Atkielski" <anthony@atkielski.com>
Date: Fri, 24 Sep 1999 09:45:00 +0200

From: Michael D. Turner <mike@lcl-imaging.com>
Sent: Friday, September 24, 1999 04:00
Subject: [Leica] Re: Low Pressure Sodium


> Similar situation with tungsten films shot in high
> K light or daylight films shot in tungsten light
> sans filtration. You simply cannot correct what
> is not recorded on the film.  Period. And if you scan
> and try to correct, you just get noise.

This is true with digital images and 8-bit scans, but with 16-bit scans, you
have more headroom and you can often pull out whatever is there and correct it.
It does increase the noise in one or more channels, but if you only need
something that looks okay visually, this may be acceptable.  Of course, it's
always best to use film that is balanced as closely as possible for the light
source.  Filters are better than corrected scans, but the right film is best,
since that provides the most information at the start.

  -- Anthony