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Hi Tanja,
Getting attractive colours from the SHO palette isn't easy (at least, IMHO). To get accurate RGB colours you need to do colour combination and calibration while your data is still linear. Narrowband colour is much more (even more?) subjective so there's no reason why you can't do colour combination after stretching if you want, and that's probably why you see people doing it both ways.
What works for me is a linear RGB combine followed by an unlinked STF stretch. That gives me a starting point with reasonable balance between the colour channels. Then I do a lot of colour tweaking. SCNR is useful to get rid of an overabundance of green. CurvesTransformation with the "H" curve lets you adjust colours selectively, e.g. change cyan to blue. Operations on the "a" and "b" CIELAB curves are my favourite way of adjusting colours, especially selectively using masks (use PixelMath and CIELAB a and b values to create a mask for specific colour ranges). ColorSaturation is also a useful tool.
It takes a while to figure out and it is useful to have an understanding of the CIELAB colour space.
Cheers,
Rick.
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