Join Luisa Winters for an in-depth discussion in this video Removing color casts with spill suppression, part of Premiere Pro Guru: Compositing and Masks.
- Now that we have a pretty good key, it's time to adjust the spill. Spill refers to the key out color showing up in the edges of the subject. In our case, having some of the green show up on the young man. Let me go ahead and change the alpha channel view to a composite view. I find it also very helpful to zoom in so that we can see the color spill better. I'm gonna change this view to 100%. And we can clearly see some of the green right here on the edges of the subject.
Let's adjust some of the parameters so that we can get rid of the color spill. Under Spill Suppression, let's start with Desaturate. Desaturate desaturates colors that are close to be being fully transparent, like the ones on the edge of the subject. I can change this value to a lot, or very little. This is going to work well at a lower values, so I wil change it at around ten. The next one is Range. This controls how much of the spill will be corrected.
More or less? I will change this value to around 63. The next value is for Spill. This is how much we're compensating for. It uses a color that would be the opposite to ours, on the vectorscope. So in our green, the opposite would be magenta. It uses this color to neutralize that shade. Right now is a little too much, so I will change the value to less, somewhere around 29 will work.
Luma, this restores the original luminence of the subject. For this we can leave it at its default value, which is 50. Now that we have a pretty good key, it is time to place the bottom footage so that we can start matching these shots. Let me go ahead and change the view to fit, and now, from the project panel, grab a clip named background. To make it easier to find, type the word background on the search field.
Move the clip to video track two so that you have a place to put the background then. Grab the background clip and put it under the other one. Now make sure that both clips have the same length.
- Working with alpha channels
- Keying blue and green screen footage with Ultra Key
- Affecting a moving piece of video with Track Matte Key
- Creating a composite with the Difference Matte effect
- Using Luma key for a brightness-based composite
- Changing the character of footage with blend modes
- Masking effects to certain portions of your footage