Popular coloring

A 2-panel top/bottom example of presenting emission bands in different channels.
Top: SHO (HST) palette rendering showing 3 emission concentrations (S-II as red, H-alpha as green, O-III as blue). Bottom: HOO bi-color rendering showing 2 emission concentrations (Ha-alpha as red, O-III as cyan).

Popular narrowband composite colouring

Hubble / HST / SHO

The Hubble Space Telescope palette (also known as 'HST' or 'SHO' palette) is a popular palette for color renditions of the S-II, Hydrogen-alpha and O-III emission bands. This palette is achieved by loading S-II, Hydrogen-alpha and O-III ("SHO") as red, green and blue respectively. A special "Hubble" preset in the Color module provides a shortcut to color rendition settings that mimic the results from the more limited image processing tools from the 1990s.

H-alpha + O-III bi-color

A popular bi-color rendition of H-alpha and O-III is to import H-alpha as red and O-III as green as well as blue. A synthetic luminance frame is then created that only gives red and blue (or green instead of blue, but not both!) a weighting according to the two datasets' exposure lengths. The resulting color rendition tends to be close to these bands' manifestation in the visual spectrum with H-alpha a deep red and O-III appearing as a teal green.