John Francis wrote: > On Mon, Jun 30, 2008 at 01:38:37PM +0000, [EMAIL PROTECTED] wrote: > >> Underexposure and correction in conversion always results in severe noise. >> Don't kow why. But I know it happens, so I avoid it . . . >> > > It happens because noise is (by definition) pretty much random. > > If you underexpose by two stops, and correct in conversion, you're going > to get a certain amount of noise. If, however, you expose correctly, > you're going to get four times the number of photons contributing to the > signal. [ ... ] I think you are missing my point here. I was talking about correcting in software "outside the camera" as an alternative to correcting using the ISO setting, given exactly the same exposure settings. I mean, when you shoot at anything above the "native" ISO, you are also in reality underexposing at the sensor level (if the exposure is "correct" according to the meter etc.) since the sensor itself has a fixed sensitivity. Right?
- T -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
