Jump to content

  •  

CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.

Photo

Dark Flats in Pixinsight

  • Please log in to reply
7 replies to this topic

#1 fetoma

fetoma

    Gemini

  • *****
  • topic starter
  • Posts: 3017
  • Joined: 26 Sep 2006
  • Loc: Southern NJ

Posted 12 November 2019 - 01:31 PM

Some CMOS cameras don't do well with bias frames so we are supposed to use dark flats to replace them. My question is how do you incorporate (load) those into Pixinsight. Do you load them into the darks, flats, or bias tabs in the BPP script, or, how to use them in the imagecalibration/imageintegration modules?

 

Thanks smile.gif



#2 Jim Waters

Jim Waters

    Gemini

  • *****
  • Posts: 3173
  • Joined: 21 Oct 2007
  • Loc: Phoenix, AZ USA

Posted 12 November 2019 - 01:37 PM

Very good question fetoma.  See this post below.

https://pixinsight.c...p?topic=11992.0

 

Download current BPP Flat/Dark

http://www.covington...rocessingFD.zip

 

Check out...

https://pixinsight.c...p?topic=12625.0


Edited by Jim Waters, 12 November 2019 - 01:45 PM.

  • santafe retiree likes this

#3 Jim Waters

Jim Waters

    Gemini

  • *****
  • Posts: 3173
  • Joined: 21 Oct 2007
  • Loc: Phoenix, AZ USA

Posted 12 November 2019 - 01:43 PM

Because of recent PI releases he may update the BPP Flat/Dark script to include the new Pixel Rejection options.



#4 fetoma

fetoma

    Gemini

  • *****
  • topic starter
  • Posts: 3017
  • Joined: 26 Sep 2006
  • Loc: Southern NJ

Posted 12 November 2019 - 02:25 PM

Thanks Jim!



#5 pfile

pfile

    Fly Me to the Moon

  • -----
  • Posts: 5291
  • Joined: 14 Jun 2009

Posted 12 November 2019 - 03:00 PM

the "older" way to do this is to prepare your master flats separately by loading the flat darks and the flat subs together with a dummy light and running BPP. then you get a master flat which you can subsequently use in another run of BPP.

 

having said that, i see that in BPP 1.51 under the "flats" tab there is a checkbox that says "calibrate with flat darks only". if you load flat subs that match the duration of the flats, BPP should identify those darks as belonging to the flats and use the flat darks instead of trying to scale darks of a different length. i don't know when this feature appeared... but i think it would do what you are looking for.

 

rob


  • fmeschia likes this

#6 fetoma

fetoma

    Gemini

  • *****
  • topic starter
  • Posts: 3017
  • Joined: 26 Sep 2006
  • Loc: Southern NJ

Posted 12 November 2019 - 03:20 PM

Thanks Rob!



#7 Billx

Billx

    Sputnik

  • -----
  • Posts: 37
  • Joined: 20 Oct 2018

Posted 12 November 2019 - 04:08 PM

What is a "dummy" light - any light sub you have on your HD?


  • Jim Waters likes this

#8 pfile

pfile

    Fly Me to the Moon

  • -----
  • Posts: 5291
  • Joined: 14 Jun 2009

Posted 12 November 2019 - 04:26 PM

yes - basically a light frame from the same camera for which you’ll just throw away the calibrated result.


CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.


Recent Topics






Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics