1 inch = 25.4mm or 0.0254m
2700dpi = 0.0254/2700 = 0.00000941m = 9.4 um per pixel
4000dpi = 0.0254/4000 = 0.00000635m = 6.4 um per pixel
Roman Kielich wrote:
> According to Fuji- diffuse rms granularity of Velvia RVP is 9, Provia
RDPII 10,
> Sensia II (RA) 10, Astia RAP 10, Fujichrome MS at EI 100 10, EI 200 11,
> EI 400 13, EI 800 15, EI 1000 16, Provia 400 RPH and Sensia RH 15,
> Sensia 200 RM 15, Fujichrom prof 64T 11, Fujicolor NPS 160, NPL 160,
> NPH, Superia Reala CS , Superia CN, Superia 200 CA,
> Superia 400 CH - all have rms granularity of 4
Now all I need to figure out is what that means in micrometers. :) If it's
already
*in* micrometers (and I suspect it may be) then films with RMS granularity
less
than 10um will look better than those that have higher granularity. But it
also
means that in many respects you *are* seeing the grain - but the aliasing
issue
is that the pixel size and grain size are similar - so the randomness of the
dye
clouds will alias against the linear CCD.
Please tell me that the last figures are a typo - Reala and Superia 400CH
surely
have a granularity of 14 not 4? I find it hard to believe that the grain in
Reala is
half that of Velvia.
I'm certain of the pixel sizes - can someone help me out with the comparison
to
grain?
Rob
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