How do you copy a mask in DaVinci Resolve?

To copy a mask in DaVinci Resolve, you can use a bitmap node. Here's a breakdown of the process:

Steps to Copy a Mask

Here’s how to copy a mask from one clip to another using a bitmap node in DaVinci Resolve's Fusion page, as indicated in the reference video:

Start with Your Clips: Begin with the clip that has the mask applied to it, and the clip where you want to apply the same mask.
Add a Merge Node: Bring a new Merge node to the Fusion page.
Connect the Source Clip: Connect the clip you want to apply the mask to into the Foreground input of this Merge node.
Add a Bitmap Node: Add a Bitmap node in the empty area of your node graph.
Connect the Masked Clip: Connect the original clip that contains your mask to the Bitmap node. This action will pull in the mask information.
Increase Soft Edge (Optional): Adjust the Soft Edge slider in the Bitmap node to adjust the feathering.

Step	Action	Description
1	Initial Setup	Have your original masked clip and the target clip ready in the Fusion node graph.
2	Insert Merge Node	Add a Merge node and connect it as a downstream node of the unmasked target clip.
3	Foreground Connection	Connect the unmasked clip to the Foreground input of the new Merge node.
4	Bitmap Node	Create a Bitmap node in your node tree .
5	Connect Masked Clip	Connect the masked clip into the Bitmap node. This extracts the mask data.
6	Soft Edge Adjustment	If desired, increase the Soft Edge slider on the Bitmap node for a feathered mask.

The Bitmap node is essential for transferring mask data. It essentially copies the mask as a black-and-white image to be used as a matte.
You can adjust the softness, position, and size of the mask using the Bitmap node's controls.
This technique is helpful when you want to apply the same mask to multiple layers or clips in your composition.

By using a Bitmap node, you can quickly and efficiently copy masks within DaVinci Resolve.