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EP 34: Masking Tips

By - Nov 19, 2021 15:51 PM

In this tutorial, we'll learn some tips related to masks. We'll learn how to add

  • Full-Screen Masks
  • Coloring Masks
  • Garbage Masks
  • Holdout Masks

Full-Screen Mask

The full-screen mask is a feature that lets us add a rectangular or circular mask with the same size as the clip. It's practical to get the mask centered or to apply certain effects.

screen mask

To apply, we'll select the clip in the timeline and double-click on the ellipse mask. As we can see, the new mask has the same height and width as the clip. We can change the scale of the mask, and it will be kept centered.

change screen mask

If instead of the ellipse mask, we can double-click on the rectangular mask, we'll see the colored border of the mask around the clip. If we scale this mask, we'll also see that it's perfectly centered.

scale mask

These masks will be aligned with the clip but not to the project. This means that if the clip has a different size or it's been transformed in some way, the mask will not necessarily fill the viewer screen. Every mask has color. We can change the color to identify the masks that we are using.

change color

For example, if we are rotoscoping the surfer in this shot, we'll be using several masks together. It's useful to identify each one with a different color. To do that, we can simply click on the color box next to the mask in the Control Panel and select the color you want. We can also rename each mask by right-clicking on it and then clicking on rename.

Garbage Mask

When we are keying a clip, sometimes, we might have extra objects or areas which are not being keyed out. But we don't want them to be in the final composite. Like in the 2nd shot, we don't want the walls or stands to be visible. We can create what's called a Garbage Mask to get rid of the area of the frame that we are not interested in.

garbage mask

In this other example, there's this small section of the background that was not properly illuminated during shooting. So, it's not keying out correctly. In this case, it's easier for us to create a mask around that area in particular and invert that mask.

use mask

Sometimes, we might have to animate the path or the mask so that it doesn't take out part of our subject. In other situations, we can have the opposite problem when the keying is affecting sections we don't want to key out.

keyed out image

Hold out Mask

Like in this example, the actor's t-shirt has the same color as the background, so it's keyed out.

To fix this problem, we can use what's called a Hold Out Mask. We'll duplicate the clip on the second track. In the bottom clip, we'll create a mask around the affected area and deactivate the keying effect.

create mask

And we can animate the path of the mask to avoid it from coming out of the keyed section.

keyed image

So, those were some tips on masking in Filmora Pro. To learn more about editing in Filmora Pro, make sure to check out our other tutorials in the series. And remember, there is no limit to what you can make.