Exposure control in a raw developer: misnomer?

Started Jan 30, 2013 | Discussions thread
Detail Man
Detail Man Forum Pro • Posts: 16,816
Re: Absolutely correct.

dosdan wrote:

Great Bustard wrote:

It's funny, 'cause if you ask someone who considers ISO part of exposure, and you ask them if f/2.8 1/100 ISO 100 and f/5.6 1/100 ISO 400 result in the same exposure for a given scene, it's exceedingly rare that the answer to this simple yes or no question will take the form of "yes" or "no".

GB, ask them this: if they consider these 2 exposures to be equivalent, what about the 2x worse shot noise SNR in the ISO400 shot due to the 1/4x smaller total number of photons collected during the exposure period?

Perhaps if the (RAW processor) control in question was renamed to "Image Noise Amplification Factor" - as more positive valued settings of such a digital-amplification control-slider indeed do just that (in cases where a higher Radiant Exposure of the image-sensor would have helped to minimize relative Photon Shot Noise while increasing Brightness, and a correspondingly lower ISO setting would have helped to minimize relative Read Noise) - it would very likely get just a little bit more attention ?

Good luck convincing Adobe's marketing executives on that one, however !

It does not have to be "mathematically perfect" in order to be "demonstrably better" to the eyes.


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