Why no set ISO in postprocessing ?

Started Feb 26, 2013 | Discussions thread
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hea
hea
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Why no set ISO in postprocessing ?
Feb 26, 2013

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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