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Comet Processing - color calibration

Andre Vilhena
in PixInsight
Hello,

I have used the SXT route to process the C2022 E3 comet and when color calibrating it, the green coma turns blue. Images were taken with an OSC camera, 130 x 30 sec subexposures. Two thing I noticed:
- R and G calibration factors seem low: 0.74 and 0.64, respectively.
- When applying DBE to the comet only image, background keeps having a green hue (albeit less).

What could be the origin of this?

Thanks,
André

Comments

  • BlockHeadBlockHead
    Did you Drizzle the OSC 1x1?
    I am almost done with the OSC comet tutorial. 
    This is has been hard work because I have created a couple of new methods for doing it.

    -the Blockhead
  • Andre Vilhena
    I haven't... But I am puzzled at which stage should I create the drizzle files. Talking about the stars images, should I do it on the registration before comet subtraction (but then the integrated files are not the ones registered) or should I re-register after comet subtraction?
  • BlockHeadBlockHead
    These videos are being uploaded NOW
    going as fast as I can.
    This method is entirely new
    and "adam block" thing

    It is a puzzle isn't it?

    -the Blockhead
  • Andre Vilhena
    Yes, indeed...
  • BlockHeadBlockHead
    The answer(s) is/are now available.
  • Andre Vilhena
    Indeed... Have watched it and applied - it improved! It is a tricky technique: I thought it would be easier to shoot the comet with an OSC but I was wrong. And the only advantage of OSC is to be able to make a color video, if you wish.

    Let me take this opportunity to let you know I am really happy to be member of Horizons collection. It definitely improved my PI skills and the difference in my photos are sensible (I think!... :) )

    Cheers,
    André

  • BlockHeadBlockHead
    Unfortunately I originally had a "clever" idea for OSC...that did not work out.
    So what you see now is less simple than I had originally hoped. The problem is that for drizzle to work (which is necessary), it refers to the original unregistered and *undebayered" data and that breaks everything. 
    -the Blockhead
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