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Month: March 2024

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Week 18 – Remove Markers

Grain
  • Regrain: Merge the degrained plate and the original plate with the ‘Minus’ operation, and merge it again with the original plate using the ‘Plus’ operation. This technique allows easy regraining of the plate without additional nodes such as Grain.
  • DasGrain Gizmo: The CommonKey gizmo generates alpha from the difference between the denoised plate and the patchwork area. This alpha is then used as a mask for DasGrain. Select an area in the Replace tab (preferably not too bright or too dark, aiming for a flat area) and analyze it.

You can find various Gizmos on this website: Nukepedia

Clean Up
  • Patch (Changing Light): For scenes with changing light, create low and high-frequency patches separately. To make the low-frequency (light of the object) plate, blur the original plate. For the high-frequency (details of the object) plate, merge the original plate and the blurred plate using the ‘From’ operation or Laplacian node. Merge each patch with the ‘Plus’ operation. Disable the roto nodes, and the original plate and the merged result should match.
  • Interactive Light Patch: Create a patch in the traditional way and copy alpha from the patch. Apply it to the original plate with a slight scale-down. Blur both the patch and the original plate and merge them with the ‘Divide’ operation. Merge it with the initial patch using ‘Multiply,’ add grain for a natural look, and finally, merge the patch back to the original plate with ‘Over.’
  • CurveTool Node: Use the CurveTool node to match fluctuating colors or remove fluctuations. Set the region with a Crop node and apply the CurveTool node. Set Curve Type to Max Luma Pixel, press Go, and copy links for Maximum/Minimum Luminance Pixel values. Paste (absolute) these values to Gain/Lift in a Grade node. (You can use Avg Intensities to get only luminance information from the scene.)
  • Clean Up with Roto and Transform Nodes: An easy and fast way to clean up involves roto around the marker, transforming the plate underneath to hide the marker, matchmoving the roto shape, premultiplying, and merging it over the original plate. Repeat for every marker.
  • Inpaint Node: The Inpaint node is similar to using transform and blur nodes. Connect the source from the original plate and the matte from roto. Change Fill Region to Matte Alpha.
Sharpening

When using the Sharpen node by itself, the dark area may appear too crisp. Make it softer by using the Gamma and Log2Lin nodes. For Gamma, increase the value to sharpen the plate, then add another Gamma and decrease the value back. For Log2Lin, set the operation to ‘lin2log’ initially, sharpen the plate, then add another Log2Lin and set the operation to ‘log2lin.’