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Messages - dpaul

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16
General / STAR ALIGNMENT DIFFICULTY
« on: 2018 June 27 14:21:08 »
Hi,

I've been taking narrowband frames of M57 and also using a 2x Powermate to increase the image size. The frames are good but there are not that many stars in the field but still enough (I hoped) for star alignment. However, no matter what settings I use, I can't get star alignment to work, or at best I got about 20% of the frame sto align.


What is best settings for the most difficult cases - the other probelm is that HA and OIII by their nature also reduce the number of visible stars.


It all works without the powermate but not with it.


Is there a way to manually selct the reference stars?

David

17
General / Re: ACCESS VIOLATION ERROR
« on: 2018 June 19 12:22:46 »
Thanks Rick

If you don't use it often maybe it would happen again with continuous use

David

18
General / Re: ACCESS VIOLATION ERROR
« on: 2018 June 18 13:22:14 »
Hi Rick

Thanks for the reply - I can see Juan has made earlier reference to potential issues with Dell graphics and also possible ''poor windows 10 updates''.

I'll have to manage ''as is'' for now.

If anyone else has input on their experience, would be good to if the same machine and / or operating system as I have. I have a Dell XPS (30 Ram, I7 processor, 4K screen)

Thanks

David

19
General / ACCESS VIOLATION ERROR
« on: 2018 June 17 16:36:07 »
Hi,

This is a well documented topic on the forum.  I have the latest update of PI and use a Dell 30 MB Ram / I7 laptop with Windows 10.

I've had the ''access violation'' error come up on and off over the last 6 months. Some times I can use PI on several occasions and I never get the problems. Other days (like today) is happened about 8 times.


As already documented by others, it does help if PI is properly closed down after use (not just using the 'X'). Even doing this I can still get the error part way through a PI session.


I wanted to share my experience because there are 2 distinct processes which tend to cause this problem for me, they are ''dynamic crop'' and dynamic background extraction''.  Is it possible there really is some kind of bug?

It would be useful to have a survey of PI users to ask how many have had the problem, how often and any trends in when it happens.


I love PI so apologies for this note but it is very very frustrating - I hope there is a solution within PI itself?


One question - recent PI updates only were minor ones, wasn't there meant to be a major one soon?
The version I have is 01.08.05.1353

Thanks

David

20
Thanks Juan,

I'll be patient until the new software update - its only happening some of the time !
Yes, windows 10 can be very annoying!!!!!!!!!!!!

David

21
Thanks Rick

I'll keep an eye open for this - last night I did get the problem again during the same session after using it for an hour - so it is intermittent.

David

22
Hi Rick

That's the problem - its intermittent / unpredictable.

It seems to happen most often after exiting the program following a lengthy processing period then restarting soo afterwards.

I'll try to look for trends

Thanks

David

23
I've been getting this same issue for about 6 months now (I have the latest version of PI). Laptop has 30 RAM, i7 processor and disc less than 50% full.
I can use PI for hours then after closing and re-opening it has the access violation error until I've closed and re-opened a few more times.

Often certain processes seem to cause it - Dynamic crop and Dynamic background extraction seem the worst culprits.  I can live with this but I'm always saving data regularly in case it bounces me out.

I love PI and don't mean to be critical but so many people seem to mention this, surely it must be a bug in some way. Nothing else I do ever causes this.

Thanks

David

24
Hi Wim,

Thanks for the note -

Still struggled to get a decent star mask from the stretched luminance image. HDRMT did help reduce the dominance of the galaxy core but I still barely detected the nearby brightest star.

In the end I redid the whole thing (to get better colors, etc) and taking a bit more care. Everything was in the order that you suggested except I did MT just prior to stretching which was much easier with the star mask generation. Also I did arcsinhstretch for the RGB then a little bit of HT too to stretch a bit more - better contrast. It meant the RGB was more balanced with the HT stretched luminance Image. The end result seems to be better and stronger colors.

Incidently, I tried PCC and color calaibration and the latter was the one final chosen, the colors seemed better 'on this occasion'. Sometimes I get the opposite.

See attached final image, not perfect - still a bit noisy. The reason is that the mask I used for the galaxy when reducing noise was probably too wide - better if I'd just protected the inner spiral arms.

Thanks

David



25
Hi Wim,

I think I did deconvolute before noise reduction (could be wrong). I also made a mask to protect the galaxy by using arcsinhstretch on a clone and stretching / black level until everything but the galaxy was clipped. This I believe may have also create weird contours.

Either way, I've had another attempt, definitely convolution done first. Also a mask created with a light extracted clone then range selection to just show the galaxy and made is blurred with the smooth slider.

Tthe attached result seems a lot better, no contours.

The only issue I still had was creating a star mask and doing MT to reduce star size. No matter what star mask settings I chose, I couldn't include the brightest star near the galaxy. So some of the stars are still a little bloated but at least not too over-processed now. Advice on star masks would be useful.

Thanks

David

26
I've just been using a mask to protect a galaxy (M66) whilst using MLT for noise reduction. This was on both RGB al L images (still Linear).
The masks in each case were created by creating a clone then using range selection to only include the galaxy. I also made is blurred  it with the smoothness slider.
In both cases I still some subtle contours - see attached images, the RGB is still linear and the L is stretched but in both the contours are visible.

How can avoid these contour lines?

Thanks

David


27
General / Re: Processing Question: Where did the color go?
« on: 2018 March 04 16:03:30 »
Thanks Cho

David

28
General / Re: Debayering One-Shot Color data
« on: 2018 March 04 16:01:55 »
Hi Warren,

Thanks for this, I will only be debayering the integrated FITS frames.

The main problem was trying to debayer 2x2 binned files, I need to work on 1x1 only.
Not tried it yet, been having fun with LRGB imaging with a mono camera and its been snowing for a week in the UK.

Will try again with OSC soon

Thanks

David

29
General / Re: Processing Question: Where did the color go?
« on: 2018 March 04 01:39:37 »
thanks again Rick

David

30
Rick

Thanks for this, I've never used such a mask but will try

David

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