Posted by beka on Jul 03, 2023; 5:58pm URL: http://astroimagej.170.s1.nabble.com/SNR-calcs-tp2244p2258.html
Hi Karen,
I have linked 16bit and 32bit files - both of these were processed using Siril 1.2.0-beta1. For both measurements gain is 1.0, dark current and read noise are 0.0. While these values are of course not realistic they should give some idea that the calculation is working. My thinking is that the formula used is valid for values > 1 which should work when we are thinking of signal counts. For values < 1 the square root of the noise value will rise faster than that of the signal so it can't be right can it?