Here's one I haven't seen very-well-addressed on the List before:
grain-aliasing on Ektachrome. Does it/can it exist? Oh, yes. I just ran
headlong into a real beauty!
The photo was shot at Disneyland, with the Matterhorn (a roller-coaster
ride, at D'land) in the background. Same scenario as I've described
before--bright sunlight, and the subject in modified shadow (not deep, this
time), and back-lit at about 10-o'clock (sun, approximately 20 degrees left
behind the subject and 70 degrees above the horizon). My spotmeter decided
to expose for the Matterhorn--which is white--instead of the subject, my
daughter, who is "white" in the Caucasion sense ot the word, but not at all
so in reflective color. Result: another poorly-exposed slide that looks fine
on a projection screen, not-so-great on a 2700ppi scan.
What got my attention was the sky area, a clear-day blue with typical
atmospheric gradadation down toward to the horizion. What appeared at first
to be "dust" didn't quite have the dark, well-defined *signature* I'd have
expected from dust. And throughout the sky area was a lighter-blue
"footprint" that I can only describe as the look of a "woven"
paper-stock--long, regular slashes of a lighter color with a darker
drop-shadow, a "crinkled" look! I've never encountered this exact effect in
*any* of the nearly 2000 slides I've done before today, nor had I been
drinking--but I'm tempted to start! ;-)
This is probably another one of those darned "Un-reproducable Noise"
problems that I run into every 20 or 30 pictures. Attempting to JPEG it to
something "Inter-netable" softens it well beyond what I see on my monitor,
or something that would be recognizeable as what is actually going on. It
could have been produced during development processing, and probably was. My
vote is with Tony's idea about what I'd call "sympathetic vibrations"
produced by a 2700ppi scan resolution.
My "solution" was to use a fairly large soft Cloning brush (30 to 50-pixel)
at a 50% transparency in a short circular mouse-pattern, changing the
pick-up area every so often to eliminate obvious "repeats." It ain't very
hi-tech, but it seems to work. At least I've got a clean sky, now.
Best regards--LRA
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