[vlazg (George)]

Thanks Rodney for your answer.. imaging time is not a concern this time of year up here, the nights are monotonously clear for a few months ( it rained last night…) and my site is 95 k out of Darwin ,an hours drive , no big deal..
If the quality of lum matches the quality of synthetic lum then ok I’ll try it.

I have read that the unweighted average of individual RGB components does not give an optimal snr, different weights for each colour based on scaled noise estimates should be assigned.
Pix Image integration tool
Select RGB files
Parameters default
Combination-average
Normalisation = additive with scaling
Weights=noise evaluation
Scale estimator=iterative k sigma
Generate integrated image = enabled
Evaluate noise = enabled
Pixel rejection = no rejection
Clip low range =disabled
Clip high range = disabled

This came from Jim’s Pixinsight crib sheet.

Thanks again Rodney.

Any others ?

George