In praise of AA filters

Started Oct 23, 2013 | Discussions thread
rovingtim
Veteran MemberPosts: 8,234
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Re: Detail above Nyquist in MTF
In reply to Lee Jay, Oct 27, 2013

Lee Jay wrote:

rovingtim wrote:

Lee Jay wrote:

Lee Jay wrote:

Using the slanted line method of oversampling. That's s special case and no real detail can be found that way.

That has been my point all along. Software is 'creating' the appearance of detail over Nyquist in digital files.

Wrong.

So, what are those black lines in the image that are beyond Nyquist then?

Aliasing. Their spacial frequency is by-definition below Nyquist.

If that's true, then it suggests aliasing is destroying detail that would have otherwise been evident if the image had been guarded against aliasing. In other words, a file from sensor without an AA will have less real detail than a file from a comparable sensor with an AA filter.

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