[PKay (Peter)]

The base data is 2 hours of Ha.

Using pixelmath applied to the mono Ha image with simple equations:

Red channel: iif($T>0.4,$T,0)
Green channel: iif($T<0.9999,$T,0)
Blue channel: iif($T<0.1,$T,0)

Heard of tone mapping, but I don't think this is.

In the interim I imagined the term 'intensity mapping'.

It's a bit rough, although the process could be refined and useful.

2nd image has the highlights boosted using a exp. function Red: $T*$T or $T^2

Any thoughts?