Re: Reducing Moire in Imaging [was: Dot Simulation]
Re: Reducing Moire in Imaging [was: Dot Simulation]
- Subject: Re: Reducing Moire in Imaging [was: Dot Simulation]
- From: Robin Myers <email@hidden>
- Date: Thu, 15 Jan 2009 13:24:45 -0800
I think your idea of setting the f-number higher will only work if you
exceed the diffraction limit of the lens.
Robin Myers
On Jan 15, 2009, at 13:12 , Fleisher, Ken wrote:
On 1/15/09 1:38 PM, "Robin Myers" <email@hidden> wrote:
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
This is an excellent suggestion. Another suggestion that might not
be as
obvious which I have used with success is stopping down the lens
(higher
f-number), when possible. This has the effect of making the cutoff
frequency
of the system be the lens and not the detector (i.e. you are
preventing the
high frequencies from reaching the detector) thereby making it
impossible
for aliasing, and the resulting moire pattern, to occur in the digital
system.
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Colorsync-users mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden