Archived posting to the Leica Users Group, 1999/09/24
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Anthony Atkielski wrote: > 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 As I said, you cannot correct what is not recorded. However, it is amazing what can be recovered providing it has been recorded (and still exists). I've scanned old faded Ektachromes that appeared, visually, to be monochrome magenta and, managed to produce reasonably good full-color images. But there was still enough detail left in the other layers to do it. Otherwise, no. You can't reproduce detail that does not exist. Mike