AA filter question - Joe?

Started Feb 9, 2012 | Discussions thread
Peter 13 Veteran Member • Posts: 8,301
Re: Reducing moiré...

GordonBGood wrote:

Moire cannot be masked but the best way is not to allow it in the first place.

Moiré can't be masked for the channels in which it appears ; however, the above techniques work because for a Bayer pattern sensor the green channel is sampled at a higher rate than the colour channels and therefore tends to have less or little moiré patterns in the first place. Thus, using the green channel as the luminance signal and restoring the colour information from a very blurred version of the colour channels, one ends up with an image that appears to have less moiré yet retains the detail. As specified, this works best when only applied to the problem moiré areas and under the conditions mentioned.

I meant can . In short, something can be done but the damage is there already.

Here is an example of color aliasing (not classical moire but related), 21mp on FF:

corrected in LR4, a slightly different crop:

One of the effects is that the image is desaturated. It still looks not so great.

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