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Re: filmscanners: Supra 400 shadows

To deal with the noise, you might try converting to LAB and then using the
median filter on the A and B channels - this should not lose any detail.


----- Original Message -----
From: "John Matturri" <jmatturr@earthlink.net>
To: <filmscanners@halftone.co.uk>
Sent: Wednesday, August 01, 2001 8:20 PM
Subject: Re: filmscanners: Supra 400 shadows

| > | I've been having good results using Supra 400 (SS4000, Vuescan,
| > | 7.1.7) except for the noise-like areas in dark parts of the image. At
| > | times I can partially compensate for this by setting the black point
| > | only at the cost of losing shadow detail that at times is needed for
| > | image (and often still not really getting an adequately clean shadow
| > | areas). Any suggestions about how best to deal with this problem?
| >
| > Keep the shadow detail and deal with it in post-scan processing with
| > Photoshop or you software of choice.
| >
| Mark
| Any suggestions?
| I do generally set the black and white points in vuescan wide allowing
| me room to set them in photoshop. I can get rid of some of the problem
| that way, but lose shadow detail. I've also selected the affected
| shadows and despeckled, which works kinda ok for backgrounds (as I guess
| would a gaussian blur) but is not good when you need the shadow image to
| retain its sharpness. I've also tried to select the affected area and do
| a replace color on red or other speckeled pixels and then manipulate
| them into the background. These techniques improve the situation but not
| really to my satisfaction.
| Has anyone not had the shadow speckling with this film? It doesn't seem
| to be ccd noise so is it a grain interaction? (If so, there's up for a
| hi-res drum scan that might fully resolve the grain, I guess.)
| John M.


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