NUKE in Stop Motion: Clean Plate Cleanup – Method 1

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Fixing Micro-Movements in Stop-Motion Animation Using Nuke (Method 1)

Introduction
Stop-motion animation, though captivating, often involves challenges like unwanted micro-movements of static objects due to prolonged shooting sessions or animator missteps. With NUKE, you can efficiently eliminate these distractions by overlaying a clean plate onto your animation sequence. This guide explains how to achieve a seamless correction using advanced masking techniques, color correction, and animation tools.

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Step-by-Step Guide

1. Import the Animation Sequence
   Load your animation sequence into the project using the Read node.
   • In the Read node settings, adjust the Input Transform to sRGB to apply the color corrections set during the EXR sequence export.
2. Import the Clean Plate (Static Frame)
   Import the clean plate (a frame without characters) using the Read node that will serve as the source for correcting defects.
   • In the Read node settings, adjust the Input Transform to sRGB to apply the color corrections set during the EXR sequence export.
3. Create a Merge Node
   Add a Merge node to combine the animation sequence and clean plate:
   • Connect the animation sequence to the B input of the Merge node.
   • In the Merge node settings, change the operation from over to out.
4. Connect the Clean Plate to the Merge Node
   Attach the clean plate to the A input of the Merge node.
5. Add a Roto Node
   Add a Roto (or RotoPaint) node in the clean plate branch. Configure the settings:
   • output → rgba
   • premultiply → alpha
6. Connect the Mask from Merge to Roto Node
   To ensure the mask is applied correctly, pull the mask arrow from the Merge node and connect it to the Roto node.
7. Draw Masks
   Use the Bezier tool in the Roto node to create masks that cover the defects in the animation.
   • Apply feathering to the edges of the masks for smooth transitions between the clean plate and the animation sequence.
   • If micro-movements shift over the sequence, animate the masks by adding keyframes in the Roto node to adapt the masks dynamically.
8. Review the Results
   Preview the result in the viewer. Adjust the mask shapes or settings as needed to ensure a seamless final look.

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Conclusion​

Using a clean plate to fix micro-movements in Nuke is a powerful and professional method for stabilizing frames in stop-motion animation. Incorporating additional tools like feathering and animated masks enhances the correction process, ensuring a natural and polished final look.

Here are some articles that will help you prepare Raw sequence files for use in Foundary Nuke

NUKE in Stop Motion: Clean Plate Cleanup – Method 2
Import DNG and Export EXR Sequence in DaVinci Resolve
How to Convert RAW to DNG in Dragonframe: Step-by-Step Guide