From DXOMark: More pixels offsets noise3

Started May 30, 2009 | Discussions thread
Stan Prevost Contributing Member • Posts: 650
Re: Resampling..

Been a while, but I believe the frequency response of the gaussian blur does not have a very steep rolloff. So to get significant attenuation at Nyquist and above, there will be significant attenuation at the higher spatial frequencies below Nyquist, thus the visible loss of detail sometimes reported when downsampling with blur. A higher order filter of a different type of transfer function having a steeper transition between passband and stopband would allow preserving more detail while preventing most aliasing, but possibly at the expense of some artifacts.


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