Camera Labs

I realize that every camera is different, so the answer will vary, but I'm looking for generalizations here. All other things being equal, which of the two will add more noise to a photo.

1) Bringing up your ISO 1 stop and retaking the photo

2) Editing the photo bringing up the exposure by 1 stop in a program like Aperture

Thanks.

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Trevor Harris

Nikon D200
SB-600
YN-560 II
YN RF 603 x 4
Tamron 17-50mm f/2.8
Nikon 50mm f/1.8

Roughly speaking, they're about the same assuming you're not operating far towards either end of the dynamic range. I have seen elsewhere a suggestion that the camera or processing software can apply a non-linear curve to the raw data so the two cases are not exactly identical, but to even find that difference you'd have to be quite an extreme pixel peeper. It's easy enough to do this test yourself if you really want to.

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Canon DSLRs: 7D, 5D2, 1D, 600D, 450D full spectrum, 300D IR mod
Lenses: EF 35/2, 50/1.8, 85/1.8, 135/2+SF, 28-80 V, 70-300L, 100-400L, TS-E 24/3.5L, MP-E 65, EF-S 15-85 IS
3rd party: Zeiss 2/50 makro, Samyang 8mm fisheye, Sigma 150 macro, 120-300 f/2.8 OS, Celestron 1325/13
Tinies: Sony HX9V.