Thanks Greg :-) I think the main thing for the star shape and colour here was the masked stretch, which I don't usually like to use. That, combined with the creation of "superR" (r+sii+ha), "superG" (oiii+g) and "superB" (oiii+b) helped I think.
Interesting colour formula. I should try that. Is it your idea?
The red patch on the left seems to have sudden edge. Is that correct or an artefact or from a mask with hard edges?
Greg.
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