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Black edges in registered images partially cut a zone of interest

JordiJordi
in PixInsight
Hello,

I have a set of HaRGB subs. The Ha, R, G and most of the B subs are ok, but some B subs (25% aprox), due to the dithering process, have partially cutted some region of interest located in a corner of the frames. When I run the WBPP script, the integrated master light files show some typical black edges that partially cut this zone of interest. The question is that I don't want to throw away any sub, because I want to take advantage of stacking the most number of them as I can, so I need to know if there's some way to avoid this black edges in a particular zone, or minimize them as much as posible, in this particular case. Maybe if I give to the "complete" subs more weight in the SubframeSelector process? Why, if I have more B filter' subs with the complete region of interest, the final master image have black edges in this zone? I've noticed that the B filter lights, taken in a different session than the other filters, have a slight rotational change of field, but most of them have the full star field that includes the zone of interest I want to preserve, so I wonder the reason why this region seems to suffer from some lack of signal, and if there's a solution that includes the "incomplete" subs.

Thank you very much for your help,

Jordi

Comments

  • BlockHeadBlockHead
    Typically if the normalization of the data is good and there is good overlap in these regions- you shouldn't see black areas. Can you make the calibrated B subs available? When you align to a reference frame- you should pick (or force) a reference image that has a FULL area that isn't shifted. If you choose an image that is an exception with a big shift- then all other images will be registered to it- and since they will not have the same coverage- you will have black in your integrated result. I am guessing this could be part of the problem?

    -the Blockhead


  • JordiJordi
    Mr. Block,

    Your suggestion was the solution to my problem. The reference frame that WBPP script choosed had some shift. When I forced the process to get another frame, the final image was ok.

    Thank you very much!

    Jordi
  • BlockHeadBlockHead
    Great... sometimes it is tough to analyze what is going on "blindly"... I am glad this worked out.
    -the Blockhead
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