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Re: filmscanners: Grain Aliasing at 2700pppi

I have been changing to LAB and splitting the channels, then applying either
a Gaussian blur or Dust and Scratches, depending on the size of the grain,
in the A and B channels only.  Most of the sharpness remains in the L
channel when you recombine.

See Dan Margulis's chapter from Professional Photoshop at
<http://www.ledet.com/margulis/LABCorrection.pdf> where he suggests this


----- Original Message -----
From: "Lynn Allen" <lalle@email.com>
To: <Filmscanners@halftone.co.uk>
Sent: Thursday, April 05, 2001 6:15 PM
Subject: filmscanners: Grain Aliasing at 2700pppi

| Grain aliasing and noise has been a regular topic on this list. It should
| be--Mark, Rob, I and others have been talking at it hard enough. Without
| spectacular results, I could add. :-|
| It's a pity that TIFFs can't be sent reasonably on the Net, because I just
| ran up against one that makes the "Tiger" I wrote about into a "pussycat."
| This new TIFF, done in Vuescan with 6 passes because Miraphoto couldn't
| handle it, has grain aliasing in every square milimeter! True, it was
| under-exposed in existing artificial light, hand-held at probably 1/15th
| 1/30th tops, with a Pentax 1.8 lens. So what?
| "There probably isn't enough 'picture there' to make a picture, there,"
| might say. You've heard it before, said it before, and so have I, more
| once. But the thing is, there *is* quite a bit of picture there, and the
| Scanwit "sees" it. Getting it *out of there* and making it presentable is
| the difficult part.
| Most people I know would say, "Give it up, man." Well fine, but I don't
| think my daughter will be graduating from highschool any time again soon.
| It's been 22 years since her last go. :-)
| Every discussion we've had on this list about G-A begs the question "How
| deal with it?" We know (or do we?) what causes grain aliasing and/or
| what films to use in future, what scanners to buy in future, et cetera.
| how does one get those hundreds of blue-green pixels out of the dark areas
| and the red-brown pixels out of the flesh-tones today, this afternoon?
| That's my question, and I'm stickin' to it. :-)
| Best regards--LRA
| PS--BTW, have you noticed that using a soft brush and Cloning smoothes out
| those offending pixels? Not a lot of help unless one wants to "repaint"
| whole picture, but it might be a start. Or not.
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