minnapple
msg:860602 | 7:20 am on Mar 24, 2002 (gmt 0) |
Ted, Moires can be tough, each one can require a different technique. I have had to fix many types over the years. Post an example and stickymail me the url and I will take a look. Minnapple
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mivox
msg:860603 | 7:35 am on Mar 24, 2002 (gmt 0) |
Hmm... You've tried the standard "despeckle" noise filter then? Too bad they're already scanned in, as I've found even a low-end scanner's "de-screen" setting helps with halftone dots and moire problems quite well...
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tedster
msg:860604 | 12:45 pm on Mar 24, 2002 (gmt 0) |
I just got angry enough to try something new. First I went to L*a*b color and grabbed the lightness channel (the orginal is a black and white so this is all I need). Then I alternated filters: despeckle - dust&scratches - despeckle. I got it pretty good that way, especially when I reduce the size. Minnapple, thanks for the offer. Look to your sticky mail!
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dabrisz
msg:860605 | 4:46 pm on Mar 25, 2002 (gmt 0) |
Try a combination of Gaussian Blur followed by Unsharp Mask. I use the following settings the majority of the time. Gaussian Blur:
Radius = .5 Unsharp Mask
Amount = 50%
Radius = 1
Threshold = 3
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tedster
msg:860606 | 11:12 am on Mar 26, 2002 (gmt 0) |
Thanks dabrisz. Those settings help. What I'm struggling with now becomes visible after the typical moire becomes unnoticeable. There's a kind of striping artifact - vertical bands about 2 pixels wide, alternating slightly darker and lighter. I may end up hand selecting the dark bands pixel by pixel and using brightness or lightness to make them come up to a near match. Tedious, but we need this image!
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mivox
msg:860607 | 6:48 pm on Mar 26, 2002 (gmt 0) |
Hehe... Could you just up the overall contrast and tweak it into a kind of "retro-teevee cool" effect? ;) Sounds like intentional distortions I've seen applied to 50's clip art before. But sometimes nothing beats those painful hours of hand-tweaking when you really need to clean up a lousy image.
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