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1. Re: Tips for reducing moire when scanning magazines?
Lundberg02 Feb 24, 2011 9:30 PM (in response to onefiftymph)I haven't had moire in years. What scanner do you have? What is it's optical resolution?
If the bed is big enough rotate the page fifteen degrees and then rotate the image back in PS.
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2. Re: Tips for reducing moire when scanning magazines?
p_d_f Feb 24, 2011 11:54 PM (in response to onefiftymph)There are some tricks for this. One is to rotate the magazine exactly fifteen degrees on the scanner and scan at the highest optical resolution of the scanner. Straightening the image after scanning will often reduce the amount of moiré. Then, on the high res scan, you can Gaussian Blur the image slightly - maybe one to two pixels, then add noise, followed by a small amount of blur - maybe .3-.4 pixels. Now you can downsample the file to where you need it. Those steps should take card of most if not all of your moiré.
But seriously, if you're the designer and have all the files to produce the ad, I would print directly from that and not worry about scanning.
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3. Re: Tips for reducing moire when scanning magazines?
c.pfaffenbichler Feb 25, 2011 12:05 AM (in response to onefiftymph)A Forum search for »descreen« should point to some old threads on the matter.
Apart from that and the previous posters’ input I would just recommend that you, if you are not doing so already, insert a sheet of black carton or paper behind the page you do scan to avoid having the backside show through.
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4. Re: Tips for reducing moire when scanning magazines?
onefiftymph Feb 25, 2011 12:13 AM (in response to onefiftymph)Thanks all. Ive had some luck rotating in the past but never heard of the 15 degree angle. Will give it a try - if I can figure out what 15 degrees looks like...Trouble is, these pages are 8.5x11 and the scanner is only 9x12 or so. The pages are "one-of-a-kind" - as in Quark originals no longer available. I show them in my book but if they were lost I'd be in trouble. I always scan with black paper backing but that only maintains opacity and doesn't affect the moire on the scan side.
Thanks for your replies
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5. Re: Tips for reducing moire when scanning magazines?
[scott] Feb 25, 2011 12:59 AM (in response to onefiftymph)If you've got a decent camera set up with enough MP and good lighting... digital photos sometimes work better than scanning.
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6. Re: Tips for reducing moire when scanning magazines?
PECourtejoie Feb 25, 2011 2:11 AM (in response to [scott])Yes, i've seen setups where there are is a flash on each side of the camera, on a special stand. I am wondering if one should put a matte glass to flatten the page, yet avoid glare from the flashes.
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7. Re: Tips for reducing moire when scanning magazines?
charles badland Feb 25, 2011 6:48 AM (in response to onefiftymph)And you are seeing actual moiré in the file? Not a moiré caused by display at less than 100% zoom?
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8. Re: Tips for reducing moire when scanning magazines?
JJLAPIN Feb 25, 2011 12:17 PM (in response to onefiftymph)I was a Drum Scanner operator back in the day. For Re Screens we would scan at 200%. Open in PS blur just enough to remove the apparent dot pattern, reduce 50% and use unsharp mask to bring it back.
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9. Re: Tips for reducing moire when scanning magazines?
Mike Gondek2 Feb 25, 2011 12:31 PM (in response to onefiftymph)FIlter >> Noise >> Median
Cleans up light to medium Moire pattern very well. You may want to run unsharp mask after that to get some contrast back.




