If you are cutting out red for example, and its the dominant color in a scene, it allows you to increase the exposure, bringing out the greens and blues, without blowing the red channel. So you get less noise in those channels than if you were to shoot without the filter then process afterwards.
On 3/19/08, P. J. Alling <[EMAIL PROTECTED]> wrote: > In low light you'll be using longer exposures, and/or larger apertures > with possible deleterious effects. It's all a compromise. On the other > hand I don't miss carrying a raft of color filters and step rings, my > lens selection has too many different filter sizes. > > > Gonz wrote: > > Except that you lose a little noise margin. Its better theoretically > > to put the actual filters on, then process. > > > > gonz > > > > On 3/19/08, P. J. Alling <[EMAIL PROTECTED]> wrote: > > > >> I would suppose they would be similar, but probably not identical since > >> sensors have a different response curve than film. I've never tried it, > >> but using digital filters after the fact will probably give almost the > >> same results. > >> > >> > >> Bill Owens wrote: > >> > If I were to use a B&W filter, say yellow or red on a DSLR then > convert the > >> > image from the sensor to B&W, would the results be the same as on film? > >> > > >> > Bill > >> > > >> > > >> > > >> > >> > >> -- > >> > >> Vote for Cthulhu. Why settle for a lesser evil... > >> -- Dr. Jerry Pournelle > >> > >> > >> > >> -- > >> PDML Pentax-Discuss Mail List > >> [email protected] > >> http://pdml.net/mailman/listinfo/pdml_pdml.net > >> to UNSUBSCRIBE from the PDML, please visit the link directly above and > follow the directions. > >> > >> > > > > > > > > -- > > Vote for Cthulhu. Why settle for a lesser evil... > -- Dr. Jerry Pournelle > > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and > follow the directions. > -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
