more pixels are better!

Started Dec 14, 2008 | Discussions thread
Les Olson Senior Member • Posts: 2,081
Re: Are those figures for "print" or "screen"? (nt)

ejmartin wrote:

Noise is properly characterized not by a single number; it has a
spectral power distribution as a function of spatial frequency. It
is therefore important to take into account when comparing images
from cameras with different pixel counts, that one has image data out
to higher spatial frequencies than the other.

Don't you mean "has image data at higher spatial frequencies if there are higher spatial frequencies in the image"? But a uniform tonality patch has zero modulation - that is what uniform tonality means. An image of such a patch does not contain data out to higher spatial frequencies, and it has only one SNR. If you want to argue that SNR at zero modulation is not the metric we need that's fine, but it is the current standard.

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2 November 1975.

'... Ma come io possiedo la storia,
essa mi possiede; ne sono illuminato:
ma a che serve la luce?'

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