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Hi Chris,
I've spent the last three
hours intensely digging into this and have come to a few conclusions that may or
may not be somewhere near reality...
1. The main culprit in my images
looking like snail barf was the misuse of the USM... I was trying to cut it too
fine by putting the threshold at 2 or 3... I was trying to not have it affect
the noise but instead it made detail "blotchy" where it did sharpen... so to do
this right you have to select or mask and then use the USM at a threshold of 0
so that everything is affected equally...
2. There is definitely a resolution
issue here... when I scan my negatives at 4000 dpi @ 16 bits I end up with a
file size of 120 MB! Averaging four 35 mm negatives like that is going to
be impressive data across the ENTIRE negative... but if you crop in tight to a
10mm X 15mm sliver of it... things begin to blur out... the bottom line... if
you use the entire 35 mm negative it will blow a CCD shot out of the water, but
if you crop in to the same area as the CCD... the CCD wins.
3. Many of the images that I did
for Rob were tiled together I believe, or he took very many frames and carefully
combined them for huge S/N gains... looks like that is what you have to do to
get a file that goes 16 X 20 print size.
Tony
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