Hello. Over last week and last night I collected 4.41 hours on Thors Helmet- LRGB.
The sub exposures are all 300sec each, the Luma bin 1x1, RGB bin 2x2.
I calibrated with flats darks and bias frames.
I stacked in Maxim using initially 1/1/1 ratios RGB then changed to 1/1/0.8 when I noticed it was so blue.
I used median combine then SD mask.
Both sets came out a deep blue background.
I enclose an unstretched frame then a blue frame that has just been cropped slightly then DD'd in Star Tools only, and finally a cropped processed frame in Star Tools -why is it so blue?
The only thing I can think of is one of the initial blue frames was actually bin 1x1 instead of 2x2 but that was only 300secs.
Help!
Graham
Hi Graham,
I don't have an explanation for you but I would suggest it should be easy to check if some of your B frames are bin 1x1 as the file sizes will be 4x bigger for 1x1 than for 2x2.
Out of interest, what camera are you using? and filters?
from memory only one single 300sec sub in B was bin 1x1 but I will check. I wonder whether the B is just too dominant to stack as a 1/1/0.8 ratio so I might try with lum then different number s of rgb frames.
It was a QSI 683 camera and astronomik filters.
The lum frames are all good SNR.
Cheers
Graham
Are you able to upload one or two subs each of LRGB in dropbox and post a link or the individual stacked LRGB subs.
I just tried stacking a 1x1 along with a 2x2 in maxim and it upscaled the 2x2 without issues. Maxim will detect the binning and automatically scale it.
Have you checked the individual subs, there could be one odd one that has a major gradient or issue that is throwing everything off.
how do the stacked LRGB subs look individually? they should resemble the raw sub closely.
I'd suggest stacking one filter at a time, then open the 4 stacked ones, and do a colour combine.
