Thanks peoples.
Allan, not sure what you would like to know exactly, so I'll give you the lot
The Imaging started at a fairly low altitude, about 20d under light polluted light pollution. The imaging finished at about 80d altitude. The resulting light pollution gradients were therefore not uniform across the session, requiring somewhat different treatment of each frame.
Images were captured using MaxDslr running a sequence routine of 3x 3min at ISO 400 each hour, so I have only captured 4hours of the 6 odd hours of the true cycle.
The sub frames were calibrated and colour extracted (G2V balanced), aligned/combined (by group) using MaxDslr
Black points and white points were adjusted/equalised also in MaxDslr.
Gradients were then removed in PS2 using Russel Cronin's gradient exterminator.
Back to MaxDslr, an attempt to get the stars all the same intensity from one frame to the next using pixel math, achieved reasonable success, though due to the imaging conditions, this was not perfect, hence the slight pulsing noticeable in varying degrees with other stars there. Once this was not too bad, back to PS2 where locked curves were used to balance up the background using the info display.
The frames were then taken back to MaxDslr for a quick animation inspection (this animation can not be saved). Once I was satisfied that I had a reasonable result, the images were again taken into PS2 and assembled there as a gif animation. whether there was a better way or not I don't know, but this was the only solution I could find to combat the varying light pollution effects accross the set of frames.
