The Hubble Palette is a popular color scheme used in astrophotography to enhance the appearance of emission nebulae. It was developed by astronomers working with the Hubble Space Telescope, and it is designed to bring out the subtle details and colors of these objects.
The Hubble Palette can be applied to images using a variety of software programs, including Siril. Siril is a free and open-source astrophotography software program that is available for Windows, Mac, and Linux. It includes a number of features for processing astronomical images, including the ability to apply the Hubble Palette.