+ Reply to Thread
Page 1 of 3 1 2 3 LastLast
Results 1 to 15 of 35

Thread: How to eliminate moiré in scanned pictures

  1. #1
    Junior Member lululoft is on a distinguished road
    Join Date
    Jun 2011
    Posts
    22
    Thanks
    5
    Thanked 10 Times in 4 Posts

    How to eliminate moiré in scanned pictures

    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?

  2. The Following User Says Thank You to lululoft For This Useful Post:

  3. #2
    Donor threadNo245 is on a distinguished road
    Join Date
    Nov 2010
    Posts
    24
    Thanks
    42
    Thanked 10 Times in 2 Posts
    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?
    You just need to google it:
    1. Scan the image at a resolution approximately 150-200% higher than what you need for final output.
    2. Go to Filter > Noise > Median.
    3. Use a radius between 1-3. Typically the higher the quality of the source, the lower the radius can be. Use your own judgement, but you will probably find that 3 works well for newspapers, 2 for magazines, and 1 for books.
    4. Go to Image > Image Size (Image > Resize > Image Size in Elements) and resample to the desired image size and resolution using the bicubic resampling option.
    5. Make sure you are zoomed to 100% magnification.
    6. Go to Filter > Sharpen > Unsharp Mask.
    7. Exact settings will depend on the image resolution, but these settings are a good starting point: Amount 50-100%, Radius 1-3 pixels, Threshold 1-5. Use your eye as the final judge.

    Tips:
    1. If you still see a pattern after applying the Median filter, try a slight gaussian blur before resampling. Apply just enough blur to reduce the pattern.
    2. If you notice halos or glows in the image after using Unsharp Mask, go to Edit > Fade. Use settings: 50% Opacity, Mode Luminosity. (Not available in Elements.)

  4. The Following 9 Users Say Thank You to threadNo245 For This Useful Post:

  5. #3
    PRC Member saifou will become famous soon enough
    Join Date
    May 2011
    Posts
    216
    Thanks
    15
    Thanked 61 Times in 51 Posts
    use the method of threadNo245 and try to rotate your image at scannig this reduce moire

  6. The Following 2 Users Say Thank You to saifou For This Useful Post:

  7. #4
    Junior Member cits is on a distinguished road
    Join Date
    Jun 2011
    Posts
    19
    Thanks
    22
    Thanked 1 Time in 1 Post
    Thank you for the advice, threadNo245!

    And additional to saifou's suggestion, could it be better if we were to rotate the image other than 90 degree?

  8. The Following User Says Thank You to cits For This Useful Post:

  9. #5
    PRC Member saifou will become famous soon enough
    Join Date
    May 2011
    Posts
    216
    Thanks
    15
    Thanked 61 Times in 51 Posts
    Quote Originally Posted by cits View Post
    Thank you for the advice, threadNo245!

    And additional to saifou's suggestion, could it be better if we were to rotate the image other than 90 degree?
    try different angle
    Last edited by saifou; 07-03-2011 at 04:21 PM.

  10. The Following 3 Users Say Thank You to saifou For This Useful Post:

  11. #6
    Junior Member fabricio is on a distinguished road
    Join Date
    Jun 2011
    Location
    Brazil
    Posts
    37
    Thanks
    9
    Thanked 12 Times in 5 Posts

    CS5 - Reduce Noise

    People...

    Take a look this link:

    http://qualityinprint.blogspot.com/2009/12/moire-part-one.html

    Very good!!

  12. The Following 4 Users Say Thank You to fabricio For This Useful Post:

  13. #7
    Moderator super silja will become famous soon enough super silja's Avatar
    Join Date
    Jan 2011
    Posts
    172
    Thanks
    48
    Thanked 40 Times in 29 Posts
    you need plug in to convert from spatial to frequency domain
    in next step you clean unwanted frequency ( moire) and
    after that convert back to spatial domain
    look at http://reindeergraphics.com/
    http://www.reindeergraphics.com/images/halftone.gif
    http://www.reindeergraphics.com/index.php?option=com_content&task=view&id=206&Item id=152

    ps
    there is also free photoshop plug but i forgot name :(
    try http://www.lunacore.com/blog/?p=87
    or google photoshop fourier transform plug in

  14. The Following 5 Users Say Thank You to super silja For This Useful Post:

  15. #8
    Junior Member blootac will become famous soon enough
    Join Date
    Nov 2010
    Posts
    37
    Thanks
    49
    Thanked 86 Times in 16 Posts
    And of course, if all else fails, you can always use the Blur filter in Photoshop. But that's a sledge hammer approach and should be left for last.

  16. #9
    Donor PommiePaul is on a distinguished road
    Join Date
    Jun 2011
    Posts
    12
    Thanks
    6
    Thanked 0 Times in 0 Posts
    alll the above and try putting black card behind the image too..

  17. #10
    Banned mae4444 is on a distinguished road
    Join Date
    Dec 2010
    Posts
    20
    Thanks
    31
    Thanked 10 Times in 9 Posts
    i think its not good to print scanned image except if you will scan with scanner drum

  18. Your ad here

  19. #11
    Donor Speed_399 is on a distinguished road
    Join Date
    Jul 2011
    Location
    Italy
    Posts
    26
    Thanks
    2
    Thanked 1 Time in 1 Post
    Quote Originally Posted by fabricio View Post
    People...

    Take a look this link:

    http://qualityinprint.blogspot.com/2009/12/moire-part-one.html

    Very good!!
    very good tutorial, thanks

  20. #12
    Junior Member aerol is on a distinguished road
    Join Date
    Jan 2011
    Posts
    30
    Thanks
    16
    Thanked 10 Times in 5 Posts
    Quote Originally Posted by fabricio View Post
    People...

    Take a look this link:

    http://qualityinprint.blogspot.com/2009/12/moire-part-one.html

    Very good!!
    That's a very good blog

  21. #13
    Junior Member z4graphix is on a distinguished road
    Join Date
    Jul 2011
    Posts
    11
    Thanks
    0
    Thanked 4 Times in 4 Posts
    I keep and old program called Paint Shop Pro 9 just for that reason. It has a tool called digital camera noise removal. It works awesome for scanned photos.

  22. #14
    Junior Member hires is on a distinguished road
    Join Date
    Jul 2011
    Posts
    8
    Thanks
    0
    Thanked 1 Time in 1 Post
    Tilt your subject on an angle when scanning.
    30-45 degree. Try many options
    All moire is pattern, thus have angle.
    Correct me if im wrong

  23. #15
    Donor jungpow is on a distinguished road
    Join Date
    Mar 2011
    Posts
    30
    Thanks
    1
    Thanked 3 Times in 2 Posts
    It's not ideal to use a scanned printed image for print production. But if you don't have any other option try to scan with dimensions at least 3 times larger than the original image and with at least 400dpi resolution. Also, make sure that your source image for scanning is larger than the final size of the reprint.

+ Reply to Thread
Page 1 of 3 1 2 3 LastLast

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts