Gradients can make or break a deep-sky image, affecting background smoothness, colour balance, contrast, and faint detail. In this PixInsight masterclass, Warren Keller demonstrates how to identify and remove gradients using a complete modern toolkit, including ABE, GraXpert, DBE, GradientCorrection, MultiscaleGradientCorrection, and GradientXTerminator.
Rather than relying on a single solution, Warren explains when each tool works best, how to avoid overcorrection, and how to protect real astronomical signal while building a cleaner foundation for the rest of your processing workflow. This tutorial is ideal for astrophotographers who want more natural backgrounds, better colour, and more polished final images.