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Thread: How to eliminate moiré in scanned pictures

  1. #16
    Angen
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    Quote Originally Posted by lululoft View Post
    How do you eliminate moiré in scanned pictures created by the printing screen of the artwork. The options of the epson scanner driver software produce bad results. Does anybody know a good tool or PSP-plugin for mac to do that?
    General, the scanners option must be the best, but you need to know how many lines per inch original has, to do an apropiate desscreening.
    Instead, you can use noise menu from Photoshop and then "despecle". (some "Unsharp Mask" may be usefull too)

  2. #17
    georgl
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    As a general advice: when scanning with a drum scanner, there as an optical way to avoid moire/aliasing by choosing a different scanning aperture. Of course it also affects resolution - just like filtering moire in post.

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  4. #18
    Donor Shap will become famous soon enough
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    CopyDot scanning

    My experience comes mainly from serving Offset and Silk Screen Printing:
    Sometimes, the best result (especially for b/w images) it to scan at very high res (usually above 800 ppi, depending on the original screen ruling) and aiming to keep the original dots as much as possible.
    Changing the image mode to Bitmap will keep it from getting re-screened (and avoiding the introduction of moire artifacts).
    When old positive halftone film separations are available, we may want to avoid de-screening, scan registered individual separations (usually at 2540 ppi) and re-create the original separations digitally, keeping all the details and quality of the original. Naturally, that is done with a suitable scanner and specialized software.

    My $0.02

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  6. #19
    Junior Member darkcyber is on a distinguished road
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    filter > median
    duplicate layer, gaussian blur a litte bit, overlay 50%
    tada...

  7. #20
    Junior Member Novich is on a distinguished road
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    Scan to 600-1200 dpi and then to use special filter for Ph "descreen". I have cracked version, if need, can upload.

  8. #21
    Donor Shap will become famous soon enough
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    Which De-Screen s/w are you using?

    We usually use the DeScreen function in the oXYgen Scan software on our Eversmart.

    I tried the Sattva s/w a few years ago but was not impressed with the results.

  9. #22
    Junior Member blast9999 is on a distinguished road
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    You can try a camera stand and photograph the work vs. scanning.

  10. #23
    Banned maeiwill is on a distinguished road
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    in my openion and i thank thats not right it is not better to print scanned image anywhere

  11. #24
    Junior Member javers is on a distinguished road
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    Photoshop Noise Filters

    You can Photoshop Noise Filters to reduce moire effect on scanned images.
    Select Filter then Noise then Despeckle or Median.

  12. #25
    Junior Member alvindp is on a distinguished road
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    try scanning rotating the image

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  14. #26
    Banned maeiwill is on a distinguished road
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    Quote Originally Posted by Novich View Post
    Scan to 600-1200 dpi and then to use special filter for Ph "descreen". I have cracked version, if need, can upload.
    upload it plz

  15. #27
    Junior Member KitaCat is on a distinguished road
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    Good suggestions-- another good filter is despeckle in PS. Try to scan in hi-res that isn't too horribly slow and space consuming; most odd effects come from a low dpi/ppi. A lot of it is trial and error that will depend on your comp's specs and scanner.

  16. #28
    cryptkeeper
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    I usually use smart blur in photoshop, bump it up a bit, I usually try to scan at 2x the resolution I need to output at.

  17. #29
    Donor xyko is on a distinguished road
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    Scan at 30º inclination

    1 - if the reticulation is generic 175 lpi and basic inclination angles(75,0,15,45), scanning your originals in 30º inclinated and 600 dpi or more.
    2 - aply gausian Blur (verify details lost)
    3 - reduce image resolution in steps (600 to 450 to 400 to 350 to 300)
    3 - aply Unsharp with large radius and smal amount to return a depth of field

  18. #30
    Banned eminempower is on a distinguished road
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    I wondered this also, thanks for the replies and posts from other members, helped me out

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