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Removing banding texture. FFT Filter for MAC?

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Old 12-15-2010, 12:18 PM
lurch's Avatar
lurch lurch is offline
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Join Date: Jul 2006
Location: SoCal
Posts: 574
Re: Removing banding texture. FFT Filter for MAC?

SBNL, you might want to look at something like Topaz Denoise 5, concentrating on color noise removal. Don't know if it would work on your hi-res versions, but it probably would on the low-res. It's not hugely expensive.
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Old 12-15-2010, 12:36 PM
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mistermonday mistermonday is offline
Join Date: Dec 2005
Posts: 3,028
Re: Removing banding texture. FFT Filter for MAC?

Lurch, noise filters will not help (much) because the noise is not random. Denoising for color will definitely remove color but will leave the image flat. Blurring luminance will be difficult beauce the patterns are very distinct and do not get interpreted as noise. Denoising color and then applying one of the blur filters will leave a real mess. See attachments Before and After Topaz DeNoise.
SBNL, if you have not already done so, try to do a new scan with ALL of the automatic features turned OFF:
- No descreen
- No Auto Color
- No Auto Levels
- No Aut Brightness
- No Auto anything
Regards, Murray
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File Type: jpg SBNL screenshot before.jpg (166.4 KB, 26 views)
File Type: jpg SBNL screenshot Topaz DeNoise 5.jpg (177.9 KB, 31 views)
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Old 12-15-2010, 04:17 PM
SBNL SBNL is offline
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Re: Removing banding texture. FFT Filter for MAC?

Thanks again to all of you for your trials and suggestions.
I tried rescanning with linear settings and Nikon's SuperFine Mode. The results were pretty much the same, maybe a bit better. I don't believe that the scanner is the issue here as I have scanned probably 400 slides, negatives (both color and B&W) as part of this project and all of the others are fine. There are even a couple of other types of film used at that same shoot (she's wearing the same outfit and at the same location) that do not have the problem.
Since you can actually see the banding just barely on the slide itself (using a loupe and light table), I believe the scanner is simply scanning what is there. This seems to me analogous to scanning an old photo that was printed on textured paper and I was hoping that I could remove the "texture" similarly.

Well, I think what it really boils down to is that I am inadvertently asking how to create data where none exist... can't be done...

Best regards,
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