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Agree with Greg, nice test Peter. CLS seems to work well in your location.
If you want to do your own approximate SNR calculation, use the same exposure for each filter, remove any bias level and then calculate:
0.4*(signal-background)/sqrt(background*0.4)
I suppose that SNR is only part of the problem though - the fact that the CLS appears to have removed that nasty background gradient is also important - it might well be worth putting up with lower SNR if you can get that sort of result. Distortion of colour balance must also be considered?
regards ray
Last edited by Shiraz; 02-09-2013 at 09:18 AM.
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