Quote:
Originally Posted by codemonkey
I've not seen much mention on this forum of doing so, but on CN and SGL it seems to be a very common approach, supposedly for the reason you specify: the theory is that you tend to stretch Ha less so stars appear to bloat in OIII and SII because of the amount of stretching you need to apply. That's the theory anyway, and so people seem to recommend going 5 for Ha and 3 for the others. I was basing my posts above on this.
Thinking more critically about it, maybe it doesn't matter that much. I can probably tweak the star sizes in PixInsight using MorphologicalTransformation, I just wanted to make sure that I wasn't making my life more difficult.
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The problem is that the star size differential will vary depending on the object. A few things I have tried that worked despite size mismatch:
- using MT or deconvolution to reduce star sizes in OII and SII
- JP Metsavanio style tone mapping which removes the stars altogether for the colour processing
- replacing the stars with RGB stars as suggested by Barry
Cheers,
Rick.