I have a question for the experts here: If the exposure is correct (at the pixel level), would a high ISO setting still be associated with high noise?
Case: You are using flash to shoot a scene (indoors). The subject is under a recessed light. When you adjust for the foreground, the background looks underexposed and dark. You increase the ISO to compensate for that. Now if the ISO setting is increased here, would the correctly exposed areas of the image be noisy?
I hope I have stated the question clearly.
Thanks!