Quote:
Originally Posted by RickS
I like to capture a bunch of R, G and B frames of an unsaturated G2V star and calculate the ratios (you need to adjust for extinction). Then I use appropriate factors from my little spreadsheet when I do the RGB combine. If seems to give a reasonable approximation of the right colours some of the time  If that fails then I mess around with PI colour calibration like Troy  |
So Rick, can I clarify? Do you adjust your ratios for each combine based on extinction and the ratio you calculated for your camera/filter/scope combination?
If so, do you work out an "average" altitude for your run of RGB images to calculate the extinction value?
DT