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Mixing frames with different gains

Rafael Sampaio
in PixInsight
Is there any undesirable effect when integrating subs with different gain values?

Comments

  • BlockHeadBlockHead
    Well.. if undesirable is the same as mathematically incorrect... then yes. If you do not compensate for the gains between images (subs or masters) then they will be given disproportionate weights when you stack them.

    This is a bit of an advanced topic. I have steered clear of it because it is a bit technical and I think most people do not care for more "mathiness" in tutorials.

    -the Blockhead 
  • Rafael Sampaio
    Thanks! For aesthetic astrophotography, what would be the visual consequences of a uncompensated gain integration?
  • BlockHeadBlockHead
    Hmm.. nothing per se.
    It is just that your worse data might be given more weight than better data because of the gain. This means that your stacked result will be noisier (or worse quality)- whereas it would have been better if the gain had been compensated for and this would not happen.
    -the Blockhead
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