Let’s start in NUKE 12.2 - 04 Understanding Premults & Alphas in NUKE

In this tutorial, you will learn the concept of Premultiplication in Compositing. You will learn how to stencil out backgrounds with the help of an Alpha channel and what the NUKE Merge Node wants to have as input. Also, we talk about different Merge Operations and why it is so important to know when to unpremult and to premult - for example with Color Corrections. These topics are covered: Project Settings Reformat a Plate Generating a colored Background Merging FG & BG Merge operations Mathematical Operations in Merge Why is Premultiplication important? Radial Node Adding Postage Stamps Using Merges Understanding Multiply & Plus Premultiplication by hand Dot Nodes Premult Node / Unpremult Node Premult Alpha / Straight Alpha Color Correction needs Unpremult Preventing Color Correction Artifacts Node Clones You find the files for this lesson on my Gumroad (free) and on my Patreon! This tutorial series „NUKE Practice Hour“ focuses on node-based Compositing with Foundry NUKE, NUKEX and NUKE Studio for 3D & VFX. It’s meant for beginners in NUKE who want to learn the fundamentals of Compositing with this great compositing package in a fun, but also practical way. Helge Maus is a Senior VFX Trainer | Houdini FX Generalist | NUKE Compositor with more than 20 years of experience in training. He delivers with his company pixeltrain | 3D | VFX | animation in-house training, workshops and online-coaching for the 3D & VFX industry. If you have questions or topics, which should be added, please let us know. If you want to support me for publishing more free tutorials you could join my Patreons: https://www.patreon.com/pixeltrain3d Or simply buy me a Cappuccino: https://paypal.me/pixeltrain And here the Gumroad Link for Project files: https://gumroad.com/pixeltrain3d Find more information on www.pixeltrain.net YouTube: https://www.youtube.com/pixeltrain3DVFXTrainings Twitter: https://twitter.com/pixeltrain Instagram: https://www.instagram.com/pixeltrain3d/ VIMEO: https://vimeo.com/pixeltrain LinkedIn: https://www.linkedin.com/in/pixeltrain/ Artstation: https://www.artstation.com/pixeltrain