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Purple in galaxies arms

Rafael Sampaio
in PixInsight
Is there any technique or tip to transform a purple tone into a deeper blue in galaxies arms?

Comments

  • BlockHeadBlockHead
    Remove red is the answer- but the issue is probably more fundamental. Why do you have excess red?
    -the Blockhead
  • Rafael Sampaio
    That’s a good question. Maybe I got to little Ha in the continuum subtraction (a 2x factor maybe could have be a better idea in this particular image), and then I pushed the red too much to compensate it. To summarize, I want the red, but I don’t want the purple. But life is made of choices, right?
  • BlockHeadBlockHead
    Yes... that would definitely do it. You need to "oversubtract" and just allow only the HII regions. Remember... screening will always result in a bright pixel taken from both images... EXCEPT if one image has small (or black) values. That is the key... manage the black values. The continuum subtracted image doesn't need to "look" good to be useful.

    -the Blockhead
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