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.
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.
"L, RGB" simply uses the loaded luminance dataset for luminance and uses red, green and blue for the colour information.
StarTools stores the masks you used in your workflow in the StarTools.log file itself.
The matrix or channel blend/mapping is selected using the 'Matrix' parameter.
The Color module fully capitalises on the signal processing engine's unique ability to process chrominance and detail separately, yet simulatenously.
In this mode, the user must click on the coloring that is to be preserved while the H-alpha is boosted.
You can convert everything you see to a format you find convenient. Give it a try!