On 20 Apr 2004 at 15:32, Collin Brendemuehl wrote: > To provide a better scan of a b&w neg > have you put a filter behind the b&w neg > and then had the software remove this > color-cast mask?
As other have eluded to there is no problem scanning B&W negs per se, it's just requires a different approach than colour due to it's grain structure and IR opacity (problem for automated IR based dust removal applications) Colour neg films are generally easy to scan as they contain a low contrast range compared to slide or B&W neg films. The limited contrast range remains well within the linear operating range of even cheap scanners so much so that the integral colour cast can be compensated for using digital filtering after the scan without an appreciable loss of quality. Most consumer scanners are designed to be comparatively sensitive to red, green and blue illumination. So putting a coloured filter in the path of what is generally a high contrast image relative to colour print film negatives will likely cause noise problems in post processing on which ever colour channel/s is/are the opposite colour of the applied filter. Rob Studdert HURSTVILLE AUSTRALIA Tel +61-2-9554-4110 UTC(GMT) +10 Hours [EMAIL PROTECTED] http://members.ozemail.com.au/~distudio/publications/ Pentax user since 1986, PDMLer since 1998
