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Removing star bloom

Petri Kehusmaa
in PixInsight
Hi,

I couldn't find any tutorial regarding how to get rid of star bloom in PI. Is this somewhere already or coming in future?

Cheers,
Petri

Comments

  • BlockHeadBlockHead
    Hi Petri,

    Yeah. That is a tough one. I haven't used a blooming camera in a very long time. 
    All of the good solutions (and this really does apply to all software) are acquisition strategies combined with processing. So for example if you rotate your camera to get a set of blooms perpendicular to the original orientation... you can reject the blooms... see:


    My preference is to use short exposures. This is helpful to take care of blooms that really hurt an object. You would then use HDRComposition to combine the short and long exposure data and reject  blooms (replace pixels with real information).

    The above technique is one I will demonstrate using globular cluster data. This is a tutorial I will eventually be making. 

    And just so you know... read this official thread from the forum:

    -the Blockhead
  • Petri Kehusmaa
    Thank you Adam.

    Rotation would be good but I'm working on old data sets and that's not an option.

    I've been using short exposures for some targets to replace bloomed stars but not for all. Now I'll be using CCDStack to reject blooms and then interpolate the pixels. After this I'll come back to PI and continue from image registration.

    Later I can play with star shapes both in PI and PS.

    The biggest problems I'm having are  Apogee's RBI and flat fields (back illuminated CCD grid-like structure will remain visible for some light frames). 
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