The same method is described by Eddie Tapp in Scanner Dust Spotting at
He has some other good reading material there, especially 90% Method of
Color Correction NEW 9/00 which uses Dan Margulis's methods but with RGB.
Maris
----- Original Message -----
From: "Richard N. Moyer" <dickmoyer@mail.earthlink.net>
To: <filmscanners@halftone.co.uk>
Sent: Monday, February 19, 2001 2:28 PM
Subject: RE: filmscanners: Nikon 8000 ED or Polaroid Sprintscan 120 ??
| Removing dust from digitized images:
| This is a quote from another poster (elsewhere - not this list, and I
| don't have the author since I clipped the quote) regarding the use of
| PS and the History Brush in PhotoShop:
| " - - working with a 16-bit file -
| 1. do your initial color space conversion (if necessary) and an initial
| levels/ curves adj
| 2. save a snapshot of current state
| 3. run dust and scratches (See Filters), checking the preview to make
| sure most of the
| debris is caught by the filter
| 4. create a snapshot of the dust and scratches state, set it to history,
and
| revert to the previous snapshot
| 5. select the history tool and set it to lighten (if using transparency
| film) or to darken (if using neg film); if you have a palette set options
so
| that pressure in "on" for size and "off" for opacity' set opacity to 100%;
| choose a soft brush
|
| The history brush should now work to remove most of the debris (setting
the
| tool to "lighten" or "darken" limits the effect to the spots you are
aiming
| at), but some debris will defeat the d/s filter (either it is just too
much
| for the settings you chose or is in an area where the contrast just isn't
| enough for the "lighten"/ "darken" brush mode to work properly). For these
| occasional spots I use the rubber stamp tool, reversing the palette
options
| so that opacity is set to "pressure" and size is set to "off."
| end of quote -
|
|
| >In researching for the SS120 we asked medium format users about features
| >including the various dust and scratch solutions. They said pretty much
to
| >the person they took excellent care of their film and did not consider
dust
| >to be a problem. They said they would rather address dust with localized
| >Photoshop work rather than a global system they perceive as softening the
| >entire image.
| >Polacolor Insight has software based dust removal. My personal testing
has
| >shown if I take a tremendously dirty slide which I have made no attempt
to
| >clean the Insight dust removal appears to be about 80% as effective as
ICE.
| >If I take a more realistic slide which has be cared and cleaned the
results
| >are much closer.
| > I also polled several Imacon d
| >dealers to see if any of their customers have requested hardware dust
| >removal solution. They responded they have never had a single request. I
| >don't think Heidleburg has it on their drum scanners. I also noticed at
PMA
| >that Imacon was demo'ing dust removal in Photoshop using the history
| >palette. Pretty neat.
| >All that being said if we did have ICE it would be easier at the point of
| >sale but I don't know how much better a scanner it would be..| >David Hemingway
| >Polaroid Corporation
|
