f-number equivalent between m43 and FF

Started Mar 25, 2014 | Discussions thread
dethis2 Regular Member • Posts: 352
Re: That "explanation" is so wrong...

xpatUSA wrote:

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.

Indeed the raw result looks more "in target".

You mean that you took the raw results by selecting a n1 x n2 area in the 35 mm shot and a 2n1 x 2n2 in the 70mm one ?.

I was talking about the results after resampling, where the lower mean value is an indication that something went wrong.

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