In praise of AA filters

Started 9 months ago | Discussions thread
Lee Jay
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Re: Pro AA filter users forget Sigma's Foveon sensor
In reply to rovingtim, 9 months ago

rovingtim wrote:

Lee Jay wrote:

rovingtim wrote:

I would suggest manufacturers are attempting to 'complete' the information obtained at 0.6 (etc) using software solutions.

I don't know of any way to do that. It's just superposition in the frequency domain that makes this stuff look weird.

The way that comes to mind is to continue the patterns and colours known within Nyquist and extend/alter according to the partial information showing up beyond Nyquist.

That isn't really possible.  "Beyond Nyquist" doesn't exist in either the original data or in the final image.  The only way to expand the Nyquist frequency in the final image is to up-sample.  So, if you get a final image of the same pixel dimensions as the sensor, there is no "beyond Nyquist" in that either.

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Lee Jay
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