Photographic Dynamic Range (PDR) is a More Useful Measure than the DxOMark Landscape Score

Started Apr 17, 2015 | Discussions thread
Detail Man
Detail Man Forum Pro • Posts: 17,073
Re: Photographic Dynamic Range (PDR) is a More Useful Measure than the DxOMark Landscape Score

bclaff wrote:

Detail Man wrote:

bclaff wrote:

Detail Man wrote:

bclaff wrote:

PDR has scaled better with shifting technology.

Would not methods such as the "PDR" method (using much higher SNRs) all seem to "scale better" ?

I think any similar method with an SNR criteria "reasonably" above 1 would be well behaved.
In the cases presented above the criteria is SNR = 4; I'm not sure I'd classify that as "much higher".

Nor would I.

However, it would surprise me if at SNR=26 dB (a linear factor of 20), sensor Readout/Dark noise components (these days) were not quite effectively "numerically swamped" by Photon Shot Noise.

I never use dB because I'm thinking photography not engineering; but in those terms my SNR = 4 is 12 dB

Photography uses log base 2 extensively. "I share your pain" in having to convert the log base 10 values published by DxO Labs. Perhaps they enjoy the panache of seeming "engineering-like" ? ...

Perhaps the base used in calculating star magnitude (2.512) might be the most appropriate of all ?

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