Mat, Thanks! I've learned much and am grateful. Jack
--- Mat Maessen <[EMAIL PROTECTED]> wrote: > On 8/8/06, Jack Davis <[EMAIL PROTECTED]> wrote: > > Appreciate your thorough answer. As it happens, I'd read and > re-read > > Fuji's on line specs, so am aware of Astia's lower RMS value. > > In comparing neg/pos films, I was curious about a structural > difference > > that would give the advantage to one or the other. > > If you look at the "real" contrast range on the film, it is very > small > in the case of color negative film. The darkest parts of the negative > (lightest parts of the image) are not very dense, and the lightest > parts of the negative (shadow areas) are limited in transparency by > the orange film base. So to get the full dynamic range out of the > image, the scanner is working in a relatively small range of light > levels coming through the film. That's why it looks grainer. > > An E-6 transparency will have a contrast range from almost completely > clear (film base transparency) to as dark as the shadow ranges will > go > in development. This is what the scanner has to deal with when > scanning it, and in many cases the dynamic range of the final image > is > limited by the scanner, not the film. > > In terms of PITA factor, it is MUCH easier to scan slide film than > print film. The color balance is at least relatively consistent, and > your light-dark ranges are about the same film to film as well. Not > to > mention the WYSIWYG factor between looking at a slide on the light > table, and looking at the scan coming out of the computer. > > -Mat > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
