DeepSkyStacker

orly_andico · Post by **orly_andico** » Wed Jan 26, 2011 3:49 pm

hi weixing

what stacking software do you use? i'm in exactly the boat, light pollution galore and everything is a hideous brown.

do you adjust the black point on every frame? or only after stacking? am using Deep Sky Stacker and the resulting stack (before adjustment) is almost pure white!

Post by **weixing** » Wed Jan 26, 2011 8:10 pm

Hi,

orly_andico wrote:hi weixing

what stacking software do you use? i'm in exactly the boat, light pollution galore and everything is a hideous brown.

I use IRIS to process the image and IMHO, the deepskystacker is just as good and is easier to use. I choose IRIS over the deepskystacker because IRIS can perform calibration step manually, so that I can do the processing over a few days when I'm free as my old laptop is very slow and I use it for work too. Now I had a new and faster PC, I can try deepskystacker.

orly_andico wrote: do you adjust the black point on every frame? or only after stacking? am using Deep Sky Stacker and the resulting stack (before adjustment) is almost pure white!

I only adjust the black point after the calibration and stacking, but I do normalize each frames before stacking.

Happy imaging and have a nice day.

orly_andico · Post by **orly_andico** » Wed Jan 26, 2011 8:36 pm

hmm.. normalize frame before stacking.. meaning? adjust white point so that the histogram almost touches the right side? or stretch so that the histogram ranges from the left to the right?

i think DSS would do this already...

Post by **weixing** » Wed Jan 26, 2011 10:32 pm

Hi,

orly_andico wrote:hmm.. normalize frame before stacking.. meaning? adjust white point so that the histogram almost touches the right side? or stretch so that the histogram ranges from the left to the right?

i think DSS would do this already...

Normalize is to set the median level of each image to 0, so that the dynamic range of the image will be increase after stacking.

I try the Deepskystacker to process the same image, the processing was very fast as it use all my CPU processing core. The result wasn't that good, but may be because I'm new to the software and some setting might not be set correctly. Will try out various setting and see what can I get.

Have a nice day.

cloud_cover · Post by **cloud_cover** » Thu Jan 27, 2011 12:15 am

How do you normalise?

orly_andico · Post by **orly_andico** » Thu Jan 27, 2011 12:25 am

yeah that's the thing.. one would think DSS would already do this as part of the process.. since it does more complex things like automatically create master flats and master darks.

Post by **weixing** » Thu Jan 27, 2011 10:00 am

Hi,
I created a new thread on this.

I have done some testing and I think the result produce by should be correct, just that DeepSkyStacker display the full tonal range of the image (or may be I can't find the setting??) where IRIS and other software can display part of the range.

Will do more testing.

Have a nice day.

dcastro · Post by **dcastro** » Thu Jan 27, 2011 8:24 pm

Any thoughts on Registax? I have tried it a few times but the source images were poor, many images were rejected (manually and automatically). I will try again with video to improve the final result when time permits but would be interested to hear if anyone has experience in this.

Post by **weixing** » Fri Jan 28, 2011 11:34 am

Hi,
I use registax on planetary and lunar, but never try it for deep sky and I don't think it's design for deep sky.

Have a nice day.