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Why
Do My Photos Have a Weird Pattern?
by
Jess Fraser, staff writer
C
hances are, you're talking about a moiré (pronounced "more-ray")
pattern. Moiré patterns come about when two halftone
screen patterns come into conflict something that you want to
avoid.
By the book
A common cause of moirés is by scanning an image that
has been previously printed with a halftone screen. A typical example
would be a printed photograph in a book or magazine. (You can tell if
an image contains a screen by looking very closely with a loop or a magnifying
glass.) If
a previously screened image is scanned and then printed, there's a good
chance a moiré pattern will appear on the image. The original screen
in the image conflicts with the screen that the printer is using to render
the image and creates a nasty optical pattern.
Work around
You can sometimes get around this issue by blurring an image
like this with an image-editing
program. Image clarity can be severely sacrificed with this method
but it may look better than a moiré pattern. Ideally, you should
try to scan the original image, not one from a book. 
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