Author Topic: Matching fluxes....  (Read 1577 times)

Offline Emanuele

  • PixInsight Addict
  • ***
  • Posts: 270
    • View Profile
Matching fluxes....
« on: 2010 November 01 15:13:41 »
Quick question: for lights taken in different nights, should the fluxes be matched between images with the LinearFit Process?

Thank you,
E.

Offline mmirot

  • PixInsight Padawan
  • ****
  • Posts: 881
    • View Profile
Re: Matching fluxes....
« Reply #1 on: 2010 November 02 09:21:54 »
Good question.

Max

Offline Juan Conejero

  • PTeam Member
  • PixInsight Jedi Grand Master
  • ********
  • Posts: 6934
    • View Profile
    • http://pixinsight.com/
Re: Matching fluxes....
« Reply #2 on: 2010 November 03 07:30:02 »
Hi Emanuele,

Not necessarily. The ImageIntegration tool will automatically normalize and scale your images, as necessary. However, the LinearFit tool implements a more accurate fitting algorithm, which we haven't implemented in ImageIntegration for performance reasons.

If you can/want afford the extra processing effort (LinearFit is relatively slow), fitting all your images with LinearFit prior to integration (e.g. as a batch process with ImageContainer) might lead to a slightly better pixel rejection —in theory this is true; what I doubt is if doing so would actually lead to better results, in practice.

Let me know how it goes if you make a comparison (for example, with the same ImageIntegration parameters and with/without pre-normalization of the images with LinearFit).
Juan Conejero
PixInsight Development Team
http://pixinsight.com/

Offline Emanuele

  • PixInsight Addict
  • ***
  • Posts: 270
    • View Profile
Re: Matching fluxes....
« Reply #3 on: 2010 November 03 08:03:51 »
Got it Juan. :) Thank you!

Will try the difference when i can, and report back!