Re: Dot Simulation
Re: Dot Simulation
- Subject: Re: Dot Simulation
- From: Robin Myers <email@hidden>
- Date: Thu, 15 Jan 2009 10:38:22 -0800
The Bayer filter pattern is not the determining factor for whether or
not there will be a moiré produced by a digital camera. Moiré is
caused by the interference of two regular patterns; the sensor grid
and the texture of the object being imaged. The Bayer pattern is a
secondary color pattern on top of the sensor pattern so its
contribution to the moiré will be various color bands. Even the Fuji
cameras with the hexagonal sensor pattern exhibit moiré with some
subjects, but the angle and frequencies of the moiré pattern are
different, but not gone.
Using a higher resolution sensor changes the frequency of the pattern,
but it does not eliminate the possibility of moiré. Some cameras
utilize a slight blurring filter (with a resulting loss of image
detail) to change the frequency of the moiré to one that may not be
noticeable. Software can do similar effects. However, whenever an
object with a pattern is sampled by an ordered set of pixels there
will always be the possibility of moiré.
If it is possible, changing the magnification of the subject relative
to the image plane (move toward or away from the subject, changing the
angle to the subject) is a simple, quick and effective way to remove
moiré without sacrificing image quality.
Robin Myers
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