> Image noise does NOT come from high ISO, it comes from low exposure [...] changing the ISO on a digital camera will NOT introduce any more noise (except for at the extremes of the range, where, for example, analog readout noise may play a role).

Sounds like you're saying that setting higher ISO does cause noise, but as long as you don't go too high you won't really notice the difference?

> If you keep the exposure the same, then changing the ISO on a digital camera will NOT introduce any more noise

So does this mean that changin the ISO directly on my camera, or in DarkTable/whatever at post-proc time is virtually the same?