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When | When an image contains an intense light pollution, it is useful to remove it. Siril provides a "Background Extraction" tool in order to remove the gradient of the sky background. Siril uses two methods for background modelling, a polynomial up to the fourth degree, or a 2-D spline. The 4th degree polynomial is generally a good choice, for this model, though the tool allows for first to fourth degree. |
Revision as of 03:44, 3 January 2015
When an image contains an intense light pollution, it is useful to remove it. Siril provides a "Background Extraction" tool in order to remove the gradient of the sky background. Siril uses two methods for background modelling, a polynomial up to the fourth degree, or a 2-D spline. The 4th degree polynomial is generally a good choice, for this model, though the tool allows for first to fourth degree.