Why no set ISO in postprocessing ?

Started Feb 26, 2013 | Discussions thread
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hea
hea Regular Member • Posts: 354
Why no set ISO in postprocessing ?

If all the camera needs to capture image are the photons hitting the sensor during exposing,

if shooting RAW why we need to fix ISO beforehand, if is an software-electronics issue ?

So why not shoot at base ISO and adjust ISO(which is an electrical gain) later in post processing ?

thanks

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