Introduction.
In this lesson,
Blending Modes.
Blending modes are mathematical operations between the colour values in two or more images or videos to composite them together. They can often be differentiated by their mathematical functions (add, subtract, multiply, divide).
Double Exposure.
The double exposure effect is the technique of combining two or more images together using their exposure.
It is referred to as the ghost effect as the effect often accidentally made people in images look like ghosts.
This is because the film in the camera (a tape made out of material that is sensitive to light) was exposed to too much light once the photo had already been taken.
Track Mattes
A track matte (Trk Mat) in after effects is a tool for controlling the alpha of one video by using the values of another.
Using track mattes to make my own composition in after effects.
To start, I imported some footage that I wanted into a new after effects composition and created a “sandwich of layers” with my main footage as the bread, and the footage that I wanted to add on top of that as the filling.
This is because using the track mattes would make my top layer hidden, and I needed to see the footage I was compositing.
I then set the track matte switch on my second clip to Luma. This meant that the footage would only be imposed on the light parts of the image. Selecting Luma Inverted would mean that the image was imposed on the dark areas of footage.