From DXOMark: More pixels offsets noise3

Started May 30, 2009 | Discussions thread
ejmartin Veteran Member • Posts: 6,274
Re: Bob..

John Sheehy wrote:

Steen Bay wrote:

Thanks. Reading Emil's reply again, I can see that he actually did
explain it nicely (and you too, of course), but still I find it a bit
counter-intuitive, that a gaussian blur affects the visible noise in
the downsampled image, but not the visible detail.

A Gaussian blur loses contrast at high image frequencies in both
noise and subject detail. It prevents or reduces the aliasing of
both in the downsizing. Aliased detail is detail that looks sharp,
but actually has less detail than the source. Aliased noise is
stronger than it would be if properly sampled.

It seems though that some people (not you, as you have mentioned many times) actually like aliased detail and its illusion of sharpness, otherwise there wouldn't be a market for taking the AA filters off of sensors.

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tko
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