Learn how to build a photometric exposure tool that mimics the behaviour of real-world aperture changes on set. This guide walks you through creating exposure adjustments that respond like the iris of a lens—bringing your grading workflow closer to the cinematographer’s intent.

In this series, we’ll explore how to build your own custom grading tools in DaVinci Resolve, starting with beginner-friendly approaches on the Colour page, moving into more advanced workflows in Fusion, and finally diving into full customisation through DCTL coding. You’ll learn how to create tools like photometric exposure controls, RGB mixers, saturation adjustments, and more—unlocking powerful ways to shape your image at every level.