How to get rid of the “moire” effect in digital camera photos?
Aug 31, 2009
in
Earthquake Questions
My first question was accidentally deleted so I need to ask again. How do you get rid of the "moire" effect when taking photos with a digital camera. I am using a Nikon D40 and took some pictures of an earthquake damaged building and it has considerable moire effect. I have Adobe CS2 – what is the procedure to get rid of it in the existing picture and how do I set the camera to avoid when taking similar photos?
Here is an example:
http://i522.photobucket.com/albums/w349/LC_Butler/jackpot.jpg
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2 comments
ProPhotographer on August 31, 2009 at 9:25 pm
In CS2:
- Duplicate the background layer;
- On this duplicate layer apply the High-pass filter at radius (3.8)
- Apply a Gaussian blur to this at radius (0.9)
- Invert the layer;
- Set blending to Linear Light;
- Set opacity at 50%;
- Mask to show only where you want to take out the Moire.
Moire is caused by distance/focus/aperture combinations. In real terms it has to do with the limits of what your sensor can resolve. There’s a ton of technical stuff here:
http://en.wikipedia.org/wiki/Moir%C3%A9_pattern
Keep checking your LCD or move back a bit and/or select a smaller/larger aperture to get rid of it if you see it.
Nick vanderwaarden on August 31, 2009 at 9:25 pm
You only get a ‘moire’ effect when you copy an image from a printed page. The original dots of the image do note line up with the dots on your screen and then you get a moire effect.
Do you mean ‘artifacts’? Coloured dots in the darker area of your image? These are caused when you use a very high ISO setting on your camera. These can also be caused in digital images when you repeatedly save the same image as JPEG’s.
Nick