f-number equivalent between m43 and FF

Started Mar 25, 2014 | Discussions thread
xpatUSA
xpatUSA Forum Pro • Posts: 11,094
Re: That "explanation" is so wrong...

dethis2 wrote:

I think you need to downsample using a good algorithm (say Lanczos) and use for this linear space instead of gamma 2.2. Gamma 2.2 is responsible for the lower mean value at the "70mm" sample.

Now that I am thinking of this .. this gamma error is in part responsible for the much less noise we percieve after downsampling as (at the dark parts like in your sample) it dampens the pixel differences much more than a correct workflow should ..

I did think about using linear export. But the last numbers I gave are from the raw data (no processing at all) and the result was similar enough, I thought.

With all your and other's recent advice which appears to include post-processing of various kinds, I'm becoming confused as to what is being compared (noise-wise):just a focal length and sensor response (only) - or full conversion of all three channels with cropping and resizing, etc?

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Cheers,
Ted

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