Q&A: What Are Moire Patterns In Scans ?

Discussion in 'How to: Q&A' started by ctaulbee, Oct 13, 2005.

  1. ctaulbee

    ctaulbee Demigod Moderator Staff Member Site Staff

    This is an example of moire patterns that need to be removed from scans before posting.

    [​IMG]

    Many scanning software packages have an option to remove moire patterns if your's has it you should enable it. This usually the best way to deal with the problem. Your scanning software may also refer to Moire Patterns as Halftone Dots same thing.

    In addition the scanning tutorial on the site has a section on how to deal with moire patterns using photoshop you can get a copy of it here.

    Link To Download The R1DB Scanning Tutorial
    Last edited: Apr 2, 2011
  2. larrylar

    larrylar 7 Time MVP Designer

    Thanks for this, I always wondered about that. I suck at scannimg.
  3. customdawg

    customdawg Guest

    Cool! Thanks CTaulBee! I scanned a cover yesterday and it came out with all those funky scan lines. I tried doing a search for a tutorial to remove it but then I found this! Heheh. Thanks again!
  4. JupiterPrime

    JupiterPrime New Member Designer

    Of course, it also pays to have a "good" scanner - I have a discontinued HP-something-or-other $70 USB PoS, which does an abso-tively, poss-olutely CRAP job...before that I had a old, blocky, took-up-half-the-desk-space UMAX Vistaseries S6E SCSI scanner that I paid $400 for 15-or-so years ago, and the descreener cleaned it out PERFECTLY - I mean NOTHING.

    You would have never known that my scanned image from a printed piece was not an original photograph or digital file - I've since tossed it becasue it was so old, there no drivers from teh manufacturer to make it work with Win2K...I had to fool the O/S into thinking it was something else that id DID have a driver for...and it was a lost hopeless cause under WindowsXP

    Id be willing to bet that today, I could have gotten it working somehow - Im sorry I trashed it - I LOVED that scanner
  5. svenno

    svenno Member Member

    I read your tutorial on scanning and (as is usually is the case) - learned something new. The formula for Unsharp Mask being approximately twice the radius value used for Gaussian Blur. Tried it on a few old scans and it definitely is easier and more consistent than my old method - trial and (mostly) error. Regarding the "straightening" tips, I remember coming across an article somewhere that recommended using the Measure Tool along any level line in the image, in conjunction with the "Image - Rotate Canvas - Arbitrary" tool (the "arbitrary rotation" amount is already filled in by the measuring tool). I have found this to be a relatively easy way to level my scans. Used to rescan umpteen times, trying to get it perfectly square. After discovering this technique, I just set up the target relatively square, scan, then line up the Measure Tool along any straight, level line within the image, then go to Image - Rotate Canvas - Arbitrary, and presto - all straight. [Had to come back this a.m. and edit. ]
    Last edited: Oct 25, 2005
  6. angryant

    angryant Guest

    thanks

    just starting to learn to do scans and all the tips are great.
    have a hp scanjet 2400 and i hope its good enough to do
    the job and pass inspection.
  7. Darth Slater

    Darth Slater this is me in 1988! man crazy huh? Subscribed

    Great tips!!! (I actually learned something,)

    and great before and after examples...

    however, Eliza, looks beautiful any old way LOL
  8. badwitch

    badwitch New Member Member

    wow i printed it out I'm going step by step, the only thing is i have a very old scanner mustek 1200 haven used it much, it didn't want to run to well with winXP
  9. brassstaxxx

    brassstaxxx New Member Member

    OK, It makes sense now, I didn't know my scanner even had that option lol... Anyways mine calls them half tone dots wouldn't have noticed if not 4 this TUT...Peace
  10. rayden54

    rayden54 Member Member

    Is there any way to remove the rainbow lines too? The tutorial just blurrs them, but they're still there (and still rainbow).

    If you don't know what I mean here's a picture.
    [​IMG]
    The top part's supposed to be white.
  11. ORiON

    ORiON New Member Member

    hey men! thanks to share this with us!
  12. jellyb

    jellyb New Member Member

    Thanks for the help with the morie patterns, I am downloading the link now, can't wait to try it out.
  13. VARA

    VARA Member Member

    WOW! ^o^

    Thank You
  14. fakeuser512

    fakeuser512 Sophomore Member

  15. crumble

    crumble New Member Member

    Get an epson scanner, i think they are the best out there!
  16. Huerta

    Huerta New Member Member

    Great tutorial!! Very useful!
    Thanks!
  17. SavageNarce

    SavageNarce New Member Member

    It would help if you could provide a little more info on the scan and resolution settings - is this a very small section of a very large scan?

    At some point, you're going to come up with artifacts like this - also known as "noise" - and there can be multiple reasons. Your source material may be faulty - is it possible the rainbow lines are printed in the original, and the scan is 100% accurate? Does this effect also occur if you scan a sheet of plain white paper? If so, you still have some possibilities: your display is causing the lines, or your scanner is doing it. To find out which, view the scan on a different computer. If the lines still appear, then the problem is in your scanner. If not, you may need a new display.
  18. ctaulbee

    ctaulbee Demigod Moderator Staff Member Site Staff

    When I saw this problem it turned out to be the scanner had an issue of somekind so for me it was new scanner and then no more rainbows.
  19. Ryu Halyabusa

    Ryu Halyabusa New Member Member

    thanks for the tips :D

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