In this tutorial, Telescope Live Co-Founder Alexander Curry, demonstrates how to enhance RGB images by using Continuum Subtraction with SIRIL. This advanced technique adds depth and detail to astrophotography images. Key steps include:

Preparing the Data:

- Organize and preprocess your Hα and RGB data, including optional steps like gradient extraction, deconvolution, and cropping to ensure alignment.

Continuum Subtraction with Pixel Math:

- Use pixel math expressions to isolate Hα data from the red channel, fine-tuning the Q-factor to balance Hα integration while maintaining image integrity.

Recombining Hα into RGB:

- Reinsert the processed Hα data into the RGB image using pixel math, gradually increasing the Q-factor to achieve optimal enhancement without overpowering the image.

This tutorial will give you a step-by-step guide to this powerful method, enabling you to produce stunning, detailed images by blending narrowband and broadband data.

Pixelmath expressions used:

Creating the continuum subtraction

RGB/K: Halpha-Q*(Red-med(Red))

Integrating continuum subtraction into RGB

R: Red+Q*(HaCS-med(HaCS))

G: Green

B: Blue+Q*(HaCS-med(HaCS))*.2