Quote:
Originally Posted by gregbradley
I did a apply images process that removes gradients and it got rid of a lot of the gradients. I can post that if you want and the process.
Your stars seem quite round so you could probably go a little longer and sacrifice a bit of star roundness for more exposure.
Greg.
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Hi Greg,
Yes I wouldn't mind seeing it, but just to advise the image I posted is a slight crop (leaving out the messy bits) of the full frame image directly from the output the Sequator after its Level 3 Uneven Light pollution reduction, plus or minus some minor level/contrast adjustment. Because I didn't use true flats, and because it is somewhat buggy (according to various sources) it creates all sorts of strange edge gradients. Take a look at the sample below which shows from left to right: No Light Pollution Reduction followed by Level 1, 2, 3, 4 and 5 Light Pollution Reduction using the Sequator Tool- I suppose their form of background elimination. I cropped out the too hard basket stuff in the Level 3 image and called it good enough, until I could get Flats. The artifacts or gradients in the the images (especially the 4th, 5th and 6th image) are not evident in the subs or final stack and somehow created by the process (as also mentioned by various sources on the net).
I did try some Ps "Apply images" work, with various settings and masks, but gave it up once I discovered that the real solution may be in using true flats and possibly using DSS instead. I'm not 100% sure of that but i will try that and also compare it with DSS. To top it all off I discovered that in the later half the focus had shifted and the final stacked image was a little imprecise, although at the image size maybe I can get away with it somewhat.
Best bet to solve everything and not have to dig so deep- get out and take some longer exposures somewhere darker than home.
Best
JA
