Starguide - A Practical Guide to Astro-Photography

Credit: Narrowband Imaging | Beginners Guide to the Hubble Palette & More

When a monochrome camera is used (like the one on the HST), the light collected from each gas in the nebula can be mapped to any color you want.

When astrophotographers process their images in the Hubble Palette, they are typically using the following color associations for each filter:

SII – Red
Ha – Green
OIII – Blue 

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