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Re: filmscanners: Grain Aliasing at 2700pppi

What about the same thing - except using smart blur?  I have had some good 
success with smart blur (which of course tries to preserve the edges).  I 
generally have to use the low end of the settings, but it can be quite 
surprisingly nifty on some images if you take care with settings.


At 10:48 06/04/01, you wrote:
>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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>| Reserve your name now at http://www.email.com

Julian Robinson
in usually sunny, smog free Canberra, Australia


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