PixInsight Forum

PixInsight => General => Topic started by: Emanuele on 2010 November 01 15:13:41

Title: Matching fluxes....
Post by: Emanuele 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.
Title: Re: Matching fluxes....
Post by: mmirot on 2010 November 02 09:21:54
Good question.

Max
Title: Re: Matching fluxes....
Post by: Juan Conejero 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).
Title: Re: Matching fluxes....
Post by: Emanuele on 2010 November 03 08:03:51
Got it Juan. :) Thank you!

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