#1  
Old 19-09-2018, 10:10 PM
jimmyh1555 (James)
jimmyh1555

jimmyh1555 is offline
 
Join Date: Jun 2017
Location: George Town TAS
Posts: 156
DSS wont stack

I just took 20 lights DSO with my ASI183 (35sec each saved as .fits)). put it through pipp, then tried to stack in DSS I checked the 20 lights then pressed "Register" It whizzed away then message came up "Only 1 frame will be stacked. Check above a threshold."
I clicked the check above threshold button tried all sorts of numbers (1,99,0,25,50) Nothing worked. What's going on? HELP There were not many stars in the picture, but when it was whizzing away, I saw that DSS had found around 57 stars. Any ideas?
Reply With Quote
  #2  
Old 19-09-2018, 11:11 PM
RyanJones
Registered User

RyanJones is offline
 
Join Date: Jun 2018
Location: Melbourne,Australia
Posts: 1,439
Hi James.

There are a couple of different things that could be causing your issue.

When you go into register, click on the advanced tab. Adjust the star detection threshold down to the lowest percentage. This will allow DSS to pick up more stars. It needs a minimum of 8 clean stars to stack on every frame. You said it picks up 57 stars so this may not be the issue but it's worth a try.

The other thing you can do is below the register button there is one that says compute offsets. Click this and it will register all of your frames and based on the quality of each frame, it will give each frame a score. The highest scoring frame will become your reference frame by which each following frame is stacked. This is where check above threshold comes in. You pick what the lowest score you want to use is and it will ignore everything lower. You may find when you do this that DSS will not come up with a score or calculate the offsets and rotation angles for some frames. This is because the quality of the stars is not good enough to be able to align it. If that is the case, then it's back outside to have another crack. )

I hope this helps
Reply With Quote
  #3  
Old 20-09-2018, 06:11 AM
bojan's Avatar
bojan
amateur

bojan is offline
 
Join Date: Jul 2006
Location: Mt Waverley, VIC
Posts: 6,932
James,

Why do you use pipp, DSS should deal with many image formats directly (Canon, Nikon, whatever).


I had stack problem only once couple of years ago, when I tried to stack a comet... there were not many stars in the frame.. but I forgot what was the workaround.

Last edited by bojan; 20-09-2018 at 07:12 AM.
Reply With Quote
  #4  
Old 20-09-2018, 05:43 PM
Gavin1234
Registered User

Gavin1234 is offline
 
Join Date: Mar 2018
Location: Sydney
Posts: 227
Were you imaging helix?

I’ve found that helix sometimes causes that problem in DSS because of the lack of stars in an unstretched image. Set star detection threshold to the lowest possible.
Reply With Quote
  #5  
Old 20-09-2018, 06:06 PM
jimmyh1555 (James)
jimmyh1555

jimmyh1555 is offline
 
Join Date: Jun 2017
Location: George Town TAS
Posts: 156
Thanks, guys! I just wrote a long post and the bloomin' thing crashed! Anyway, I found the threshold setting it was 10%. I lowered it ti 2% and it worked!
Also, Bojan, why do I use Pipp? Don't know! Somebody on this forum said to use it to sort out the debayering. What is it supposed to do?
Reply With Quote
  #6  
Old 20-09-2018, 06:18 PM
bojan's Avatar
bojan
amateur

bojan is offline
 
Join Date: Jul 2006
Location: Mt Waverley, VIC
Posts: 6,932
Quote:
Originally Posted by jimmyh1555 View Post
Thanks, guys! I just wrote a long post and the bloomin' thing crashed! Anyway, I found the threshold setting it was 10%. I lowered it ti 2% and it worked!
Also, Bojan, why do I use Pipp? Don't know! Somebody on this forum said to use it to sort out the debayering. What is it supposed to do?

It is used for image conversion.. usually to convert the stack produced by Autostakert (planetary work).


I don't think it is really necessary here, especially when you are still learning.
Reply With Quote
Reply

Bookmarks

Thread Tools
Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +10. The time is now 03:49 PM.

Powered by vBulletin Version 3.8.7 | Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Advertisement
Testar
Advertisement
Bintel
Advertisement