Jack Davis wrote:
> I've never heard or read why it seems to be the case, but I, also,
> realize a poorer image when scanning color negatives than I do when
> scanning positives. Based on posts to this list, I understanding this
> to be the common experience. At least there appears to be a "drudgery"
> factor associated with negative scanning.
I find them equally annoying to scan (at home, with a DiMAGE Dual Scan IV) :)
> I was reminded of it today when a deeply experienced lab person made an
> aside comment, "neg scans are always grainier than slide scans".
> Very difficult, and probably moot at that, to compare RMS factors
> between the two.
> I wonder about the results of a grain comparison between Reala 100 and
> Provia or Astia 100F.
Astia 100:
18. DIFFUSE RMS GRANULARITY VALUE ................. 7
Micro-densitometer Measurement Aperture: 48 µm in diameter.
Sample Density: 1.0 above minimum density.
19. RESOLVING POWER
Chart Contrast 1.6 : 1 .......................... 60 lines/mm
Chart Contrast 1000 : 1 ........................ 140 lines/mm
Provia 100F:
16. DIFFUSE RMS GRANULARITY VALUE ............. 8
Micro-densitometer Measurement Aperture: 48 µm in diameter.
Sample Density: 1.0 above minimum density.
17. RESOLVING POWER
Chart Contrast 1.6 : 1 ................... 60 lines/mm
Chart Contrast 1000 : 1 ................. 140 lines/mm
Reala 100:
12. DIFFUSE RMS GRANULARITY VALUE .............. 4
Micro-densitometer Measurement Aperture: 48 µm in diameter.
Magnification: 12 X.
Sample Density: 1.0 above minimum density
13. RESOLVING POWER
Chart Contrast 1.6 : 1 ................. 63 lines/mm
Chart Contrast 1000 : 1 ................. 125 lines/mm
> I know the lab person well enough not question him about his reasons. I
> would predict a quick flip off remark such as "I see it all the time".
> I predict that I'll soon not be worrying about such things to the same
> extent.
Another factor to consider is that with slides, there is a clear substrate
that you deal with, but with color neg, there is the shaded mask substrate.
> Anyway, anyone have an opinion or, even better, a conclusive answer?
This data comes from Fuji's online spec documents. Clearly, Provia 100F
wins for grain size, but only by a little over Astia 100.
Gabriel
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Gabriel Cain Dreaming Crow Forge
President and Chief Artifacer P.O.Box 15605
[EMAIL PROTECTED] Seattle, WA 98115
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