Quote:
Originally Posted by Shiraz
hi Pete.
Crikey that's nasty.
I'm certainly not in the PI expert camp, but that looks like (rotated) column defects in the sensor to me - my guess is that will probably come from the flats. Maybe you could check the process for making the masterflat - could there be bias, dark or pedestal in there where it should not be - or missing where it should be included?
FWIW, I found that there are quite few settings that have to be right or the master cal images can get screwed up - I ended up using the following to the letter and all went well: http://www.pixinsight.com/tutorials/...mes/index.html good luck. |
Thanks Ray
my diagnosis was the same.
I spent several hours playing with the Cosmetic Correction module in PI yesterday - with some success but its not as good as I'd like.
I am now taking new flats and will start from scratch with new bias and dark frames too.
That link is great - I have followed it to the letter to assemble the masters but I may have a setting wrong.
Will see how that goes
Its a pain - I have about 4.5 hours of each of R, G and B and a bit more Lum - I find that its my processing skills that are letting me down rather than my equipment - which is probably better than the other way around
Pete