Ray,
help me here....
Neglecting vignetting/ shadowing/ fringing (the usual target for flats...)
Why would dividing by what I see as an "evenly illuminated but random pixel distribution" image improve the SNR????
What is it actually doing to the signal?
For AP I can see the background "graininess" caused by the low SNR.....
but I can't see how dividing by basically a "constant" is going to lift the target signal above the background and effectively add to the SNR???
|