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Cheers Alex. It's something I'd like to understand better.
I've got a lot of experience working with digital audio and good practice there is to capture at -20 to -15 dB full-scale, where 0dB equals max and anything over is clipping. Because my system works at 24bit and 32bit this amount of headroom is still way above the noise floor, and leaves a lot of room for dynamics. I'm not sure how these principles translate to higher energy/shorter wavelengths. Maybe well-depth is the equivalent to audio dB?
I'm also wondering if gain is the crucial parameter in capture, and contrast is something that can be worked with in post-processing. I guess I need to go and do some reading, find out how contrast is captured. Once I get the filters happening is it just a case of optimising gain in each of the LGRB channels, and the contrast is tuned afterwards through balancing other parameters?
These questions are in relation to lunar/planetary, I'm sure deep-sky is something else altogether...
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