William Robb wrote:
In camera noise reduction is done by doing a dark field exposure, and using
that as a template for removing noise from the image exposure.
I am wondering if anyone has tried doing this as an out of camera operation?
I think it is not that simple as having an universal "dark frame" that
can be used for noise reduction by substracting it. The noise pattern
seems to be per-shot-specific, it must depend on currently set
sensitivity, exposure time, CCD temperature, perhaps also CCD aging over
longer time.
Saving a dark frame together with actual exposure and processing it
later on a PC could be a way, but seems to be quite pointless, as it
still takes the time to do the second exposure, data processing itself
is not so time consuming, so camera is locked anyway.
teem
