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(a) Selection button
The regions you defined are analyzed and grain is applied over the entire
composition. Response curves are generated and displayed in the
Animation Editor. You can now fine-tune the resulting curves—see
Fine-tuning the Grain
Removing Grain from a Composition
Removing grain from a composition allows you to composite two grainy clips
that don't match, or simply to clean up a clip. The Remove Grain tool lets
you remove as much grain as possible while minimizing damage to the image.
You can specify how many forward and backward frames to include when
removing grain from a composition. These frames can be warped by motion
vectors to remove motion and improve the grain removal process. Increasing
the number of frames will improve grain removal performance, but adds
processing time. In some cases, it may also introduce motion artifacts if used
without motion vectors or with bad motion vectors, especially in scenes with
a lot of non-uniform motion.
The Remove Grain node has two secondary inputs for receiving forward and/or
backward motion vector data. When motion vectors are connected to these
inputs, the forward and backward frames are first warped appropriately to
remove motion before being used in the remove grain process. Also, you can
automatically compute the motion vectors if they are not connected—see
About Motion Vectors
To remove grain to a composition:
1 From the Tools tab, drag the Remove Grain tool from the Grain
Management folder to the dependency graph in the Schematic view.
2 Connect a reference image and an input image to the Remove Grain tool.
3 (Optional) Add a mask to your input image to restrict the grain to a
portion of the image—see
4 In the Remove Grain tab, do one of the following:
504 | Chapter 21 Managing Film Grain
on page 711.
Click the Analyze button.
on page 505.
Creating Masks
on page 540.
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